{"id":266973,"date":"2026-07-14T15:39:45","date_gmt":"2026-07-14T15:39:45","guid":{"rendered":"https:\/\/www.solinst.com\/products\/level-measurement-devices\/122-interface-meters\/datasheet\/"},"modified":"2026-07-14T19:23:09","modified_gmt":"2026-07-14T19:23:09","slug":"datasheet","status":"publish","type":"page","link":"https:\/\/www.solinst.com\/en-gb\/products\/level-measurement-devices\/122-interface-meters\/datasheet\/","title":{"rendered":"Datasheet"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;H1 and breadcrumbs&#8221; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;792ca5bd-0808-46bd-9ce7-3bcb8e74f4d3&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;4b28f470-0d73-4e9d-b92d-e6f41f2cea24&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_heading title=&#8221;Oil \/ Water Interface Meters&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;6983e4e7-a6e0-4a8d-b486-49939fd240c0&#8243; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_heading][dsm_breadcrumbs disabled_on=&#8221;on|off|off&#8221; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; home_icon_text_color=&#8221;#d6d6d6&#8243; global_colors_info=&#8221;{}&#8221;][\/dsm_breadcrumbs][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Mobile-Only Nav with Offset&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;4759a92f-4b27-4854-bb2c-299854634e93&#8243; sticky_offset_top=&#8221;127px&#8221; global_module=&#8221;260475&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; custom_margin=&#8221;0px||||false|false&#8221; custom_padding=&#8221;0px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_code admin_label=&#8221;122 Mobile Nav &#8211; Select Dropdown&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||||false|false&#8221; custom_padding=&#8221;0px||||false|false&#8221; hover_enabled=&#8221;0&#8243; custom_css_free_form=&#8221;select {||||      font-size: 1em; \/* Adjust font size *\/||      padding: 10px;   \/* Optional: Increase padding for better spacing *\/||      width: 100%;||      box-sizing: border-box;\/* Optional: Adjust width to fit the container *\/||      height: 50px;||}||||    \/* Style for dropdown options (fallback if needed) *\/||select option {||      font-size: 1.2em; \/* Ensures option text matches select styling *\/||      width: 100%;||    }&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<select name=\"dropdown\" onchange=\"location = this.value;\"><!-- [et_pb_line_break_holder] --><option value=\"\">122 Interface Meter Menu<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/level-measurement-devices\/122-interface-meter\/\">122 Interface Meter Main Page<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/products\/level-measurement-devices\/122-interface-meter\/get-quote.php\">Get a Quote<\/option><!-- [et_pb_line_break_holder] -->  <!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/Forms\/sol.php\">Send Me Info<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/level-measurement-devices\/122-interface-meter\/datasheet\/\">Interface Meter Datasheet<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/products\/level-measurement-devices\/122-interface-meter\/122m-mini-interface-meter-datasheet\/laser-marked-pvdf-cable-mini-interface-meter.php\">Mini Interface Meter Datasheet<\/option><!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/products\/level-measurement-devices\/122-interface-meter\/operating-instructions\/\">Instructions<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/products\/level-measurement-devices\/122-interface-meter\/product-tour\/\">Product Tour<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/level-measurement-devices\/\">Level Measurement Devices<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/products\/level-measurement-devices\/lmd-comparison.php\">Level Measurement Devices Comparison Chart<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/products\/level-measurement-devices\/lmd-comparison-tape-probe.php\">Level Measurement Devices<!-- [et_pb_line_break_holder] -->\u2013 Tape &#038; Probe Comparison<\/option><!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] --><\/select>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; specialty=&#8221;on&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;5a5bca26-a9a5-4e6c-8fca-d64da3bdcd40&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_menu menu_id=&#8221;560&#8243; admin_label=&#8221;122 Interface Meter Main Nav&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;242faa89-ac4f-4e46-90fe-505e8c1eab79&#8243; global_module=&#8221;260378&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_menu][et_pb_slider disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; display_conditions=&#8221;W10=&#8221; link_option_url=&#8221;https:\/\/www.solinst.com\/instruments\/dataloggers-and-telemetry-systems\/3001-levelogger\/?utm_source=solinst&#038;utm_medium=WC-global-sidebar-position1&#038;utm_campaign=3001&#8243; global_module=&#8221;53188&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_slide button_text=&#8221;Levelogger&#8221; button_link=&#8221;https:\/\/www.solinst.com\/en-gb\/products\/data-loggers-and-telemetry-systems\/3001-levelogger\/?utm_source=solinst&amp;utm_medium=WC-global-sidebar-position1&amp;utm_campaign=3001&#8243; use_bg_overlay=&#8221;on&#8221; bg_overlay_color=&#8221;rgba(224,97,0,0.58)&#8221; button_text_tablet=&#8221;&#8221; button_text_phone=&#8221;&#8221; button_text_last_edited=&#8221;on|desktop&#8221; content_tablet=&#8221;&#8221; content_phone=&#8221;&#8221; content_last_edited=&#8221;on|desktop&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#F07C00&#8243; background_enable_color=&#8221;on&#8221; background_image=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/01\/3001-absolute-water-level-datalogging.webp&#8221; background_enable_image=&#8221;on&#8221; background_position=&#8221;top_center&#8221; custom_button=&#8221;on&#8221; button_bg_color=&#8221;#f58025&#8243; button_border_width=&#8221;2px&#8221; button_border_color=&#8221;#ffffff&#8221; button_border_radius=&#8221;20px&#8221; button_font=&#8221;|600|||||||&#8221; background_last_edited=&#8221;on|desktop&#8221; global_colors_info=&#8221;{}&#8221; button_border_width__hover_enabled=&#8221;on|hover&#8221; button_border_width__hover=&#8221;2px&#8221; sticky_transition=&#8221;on&#8221;]<\/p>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<p>&nbsp;<\/p>\n<h2>Accurate Water Level Data<\/h2>\n<p><b>Reliable Instruments that Last<\/b><\/p>\n<p>[\/et_pb_slide][\/et_pb_slider][et_pb_slider disabled_on=&#8221;on|on|on&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; link_option_url=&#8221;https:\/\/www.solinst.com\/careers\/?utm_source=solinst&#038;utm_medium=WC-global-sidebar-position2&#038;utm_campaign=SUK-regional-sales-manager&#8221; disabled=&#8221;on&#8221; global_module=&#8221;53561&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_slide heading=&#8221;Solinst UK Is Hiring!&#8221; button_text=&#8221;Regional Sales Manager&#8221; button_link=&#8221;https:\/\/www.solinst.com\/careers\/?utm_source=solinst&amp;utm_medium=WC-global-sidebar-position2&amp;utm_campaign=SUK-regional-sales-manager&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_text_color=&#8221;#000000&#8243; header_font_size=&#8221;38px&#8221; background_color=&#8221;RGBA(255,255,255,0)&#8221; background_enable_color=&#8221;on&#8221; background_image=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2026\/04\/solinst-uk-ltd.webp&#8221; background_enable_image=&#8221;on&#8221; background_size=&#8221;contain&#8221; custom_button=&#8221;on&#8221; button_bg_color=&#8221;#f58025&#8243; button_border_width=&#8221;2px&#8221; button_border_color=&#8221;#ffffff&#8221; button_border_radius=&#8221;20px&#8221; button_font=&#8221;|600|||||||&#8221; button_custom_margin=&#8221;||||false|false&#8221; button_custom_padding=&#8221;1px||||false|false&#8221; custom_padding=&#8221;76px||||false|false&#8221; header_text_shadow_style=&#8221;preset5&#8243; global_colors_info=&#8221;{}&#8221; sticky_transition=&#8221;on&#8221;]<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_slide][\/et_pb_slider][\/et_pb_column][et_pb_column type=&#8221;3_4&#8243; specialty_columns=&#8221;3&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_row_inner _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;3d68e16c-1ed2-447f-b17f-a63c20af3cf6&#8243; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][dsm_icon_list icon_font_size=&#8221;30px&#8221; list_alignment=&#8221;flex-end&#8221; text_indent=&#8221;10px&#8221; list_alignment_tablet=&#8221;flex-end&#8221; list_alignment_phone=&#8221;flex-start&#8221; list_alignment_last_edited=&#8221;on|desktop&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|600|||||||&#8221; link_option_url_new_window=&#8221;on&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][dsm_icon_list_child text=&#8221;122 Interface Meter Datasheet PDF&#8221; font_icon=&#8221;&#xf1c1;||fa||900&#8243; icon_color=&#8221;#ff8500&#8243; url=&#8221;https:\/\/www.solinst.com\/products\/data\/122.pdf&#8221; url_new_window=&#8221;on&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; icon_color__hover_enabled=&#8221;on|hover&#8221; icon_color__hover=&#8221;#828282&#8243; text_text_color__hover_enabled=&#8221;on|hover&#8221; text_text_color__hover=&#8221;#7a7a7a&#8221; sticky_enabled=&#8221;0&#8243;][\/dsm_icon_list_child][\/dsm_icon_list][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;3676f7e6-7b83-4698-94ce-2cc9fa9ae43d&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;research article&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2>Model 122 Interface Meter<\/h2>\n<p>Solinst Oil\/Water Interface Meters give clear and accurate measurements of product level and thickness in wells and tanks.<\/p>\n<p>Determination of both light (floating) non-aqueous phase liquids (LNAPL) and dense (sinking) non-aqueous phase liquids (DNAPL) is quick and easy. The factory-sealed probe is pressure proof (up to 500 psi) and tapes are available in a range of lengths from 30\u2013300 m (100\u20131000 ft). <\/p>\n<p>The 16 mm (5\/8&#8243;) diameter probe allows easy access through tight spaces and into narrow wells. The probe is designed for use in various monitoring applications. 122M Mini Interface Meters also available, see 122M Data Sheet for more information.  <\/p>\n<p>[\/et_pb_text][et_pb_text admin_label=&#8221;research article&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2>Hazardous Locations Use<\/h2>\n<p>Model 122 Interface Meters have been approved for use in explosive environments. They are suitable for use in hazardous locations Class I, Div 1, Groups C&#038;D based on standards of the Canadian Standards Association (CSA). <\/p>\n<p>The Model 122 Interface Meter with laser marked tape is now ATEX certified under directive 94\/9\/EC, as II 3 G Ex ic IIB T4 Gc.<\/p>\n<p>The grounding strap is a safety essential when the meter is used in potentially explosive environments. It also ensures that the electronics are properly protected.  <\/p>\n<p>[\/et_pb_text][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2026\/06\/122-oil-water-interface-meters-facing-left.webp&#8221; alt=&#8221;solinst model 122 oil-water interface meter for accurately measuring product level and thickness in wells and tanks&#8221; title_text=&#8221;Solinst Model 122 Oil-Water Interface Meter for Accurately Measuring Product Level and Thickness in Wells and Tanks&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_image][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;3676f7e6-7b83-4698-94ce-2cc9fa9ae43d&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; column_structure=&#8221;1_2,1_2&#8243;][et_pb_column_inner saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; type=&#8221;1_2&#8243;][et_pb_text admin_label=&#8221;research article&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2>Accurate, Reliable, Robust<\/h2>\n<ul>\n<li>Designed for rugged field use<\/li>\n<li>Stable electronics with automatic circulatory testing<\/li>\n<li>Laser marked flat tape is easy to decontaminate; resists stains<\/li>\n<li>Tape uses stranded stainless steel and copper coated steel conductors:\n<ul>\n<li>high in tensile strength; electrical efficiency<\/li>\n<li>non-stretch; does not corrode<\/li>\n<\/ul>\n<\/li>\n<li>Sturdy free-standing reel with carrying handle<\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column_inner][et_pb_column_inner saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; type=&#8221;1_2&#8243;][et_pb_button button_url=&#8221;https:\/\/www.solinst.com\/products\/level-measurement-devices\/101-water-level-meter\/get-quote.php&#8221; button_text=&#8221;Get Quote&#8221; admin_label=&#8221;101 &#8211; Get Quote Button&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;c9e00792-1360-4998-8cf9-5f6772c944ba&#8221; hover_enabled=&#8221;0&#8243; button_border_width_tablet=&#8221;&#8221; button_border_width_phone=&#8221;&#8221; button_border_width_last_edited=&#8221;on|desktop&#8221; global_module=&#8221;237567&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_button][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;3676f7e6-7b83-4698-94ce-2cc9fa9ae43d&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;research article&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2 data-uw-rm-heading=\"prs\">Interface Meter Operating Principles<\/h2>\n<p><strong>Product<\/strong><span> <\/span>(Non-conductive liquid) = Steady light and tone<\/p>\n<p><strong>Water<\/strong><span> <\/span>(Conductive liquid) = Intermittent light and tone<\/p>\n<p>To detect liquids,<span> <\/span><strong><a href=\"https:\/\/www.solinst.com\/instruments\/level-measurement-devices\/122-interface-meter\/\" title=\"Solinst Interface Meters\" data-uw-rm-brl=\"PR\" data-uw-original-href=\"\/products\/level-measurement-devices\/122-interface-meter\/datasheet\/index.php\">Solinst Interface Meters<\/a><\/strong><span> <\/span>use an infra-red beam and detector. When the probe enters a liquid the beam is refracted away from the detector which activates an audible tone and light. <\/p>\n<p>If the liquid is a non-conductive oil\/product the signals are steady. If the liquid is conductive (water), the conductivity of the water completes a conductivity circuit. This overrides the infrared circuit, and the tone and light are intermittent.  <\/p>\n<p>The 122 Interface Meter sensor provides an accuracy as good as 1.0 mm or 1\/200 ft. The high accuracy enables the sensor to detect the slightest sheen of oil on the surface of the water. <\/p>\n<p>[\/et_pb_text][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2026\/07\/122-interface-meter-taking-measurements.webp&#8221; alt=&#8221;environmental technician wearing a beige cap and white gloves deploying a red Solinst Model 122 interface meter probe into a monitoring well casing with industrial storage tanks in the background&#8221; title_text=&#8221;Model 122 Oil Water Interface Meter Field Deployment&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;3676f7e6-7b83-4698-94ce-2cc9fa9ae43d&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;research article&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2 data-uw-rm-heading=\"prs\">Obtaining Product Measurements<\/h2>\n<p>To measure the thickness of a product layer, lower the probe into the well until the signals activate. If there is an oil\/product layer on the top of the water (LNAPL), the light and tone will be steady, indicating an air\/product interface. <\/p>\n<p>Read the depth off the permanently marked tape. Lower the probe further into the water, where the signals become intermittent, then pull back up and take a reading at the product\/water interface. The thickness of the product layer is then determined by subtracting the first reading from the second.  <\/p>\n<p>If there is only water in the well and no product, there will only be intermittent (water) signals. The presence or absence of dense (sinking) non-aqueous layers (DNAPL) is determined by continuing to lower the probe to the bottom of the well. <\/p>\n<p>If the steady tone and light return, this indicates a non-conductive liquid. Measure the depth and continue lowering the probe until it touches bottom and the tape goes slack. <\/p>\n<p>To determine the thickness of the DNAPL layer, subtract the first reading from the bottom depth.<\/p>\n<p>[\/et_pb_text][et_pb_button button_url=&#8221;https:\/\/www.solinst.com\/products\/level-measurement-devices\/101-water-level-meter\/get-quote.php&#8221; button_text=&#8221;Get Quote&#8221; admin_label=&#8221;101 &#8211; Get Quote Button&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;c9e00792-1360-4998-8cf9-5f6772c944ba&#8221; hover_enabled=&#8221;0&#8243; button_border_width_tablet=&#8221;&#8221; button_border_width_phone=&#8221;&#8221; button_border_width_last_edited=&#8221;on|desktop&#8221; global_module=&#8221;237567&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_button][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2026\/07\/122-interface-meter-with-carry-case.webp&#8221; alt=&#8221;red Solinst Model 122 interface meter reel with a flat tape probe alongside a black padded carrying bag and a black plastic tape guide&#8221; title_text=&#8221;Model 122 Oil Water Interface Meter with Carry Case&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text admin_label=&#8221;research article&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2 data-uw-rm-heading=\"prs\">Additional Equipment<\/h2>\n<p>Each full size meter is provided with a grounding cable, cleaning brush, and a tape guide\/datum. A convenient carrying case with shoulder strap is optional. <\/p>\n<p>The tape guide may be used to provide support for a small reel on the well casing. It acts as a datum allowing repeatably accurate measurements; ensures that the probe hangs in the centre of the well; and protects the tape from damage. <\/p>\n<p>It is essential to use the grounding cable to ensure safety and proper function of the electronics in all applications.<\/p>\n<p>[\/et_pb_text][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;3676f7e6-7b83-4698-94ce-2cc9fa9ae43d&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;research article&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2 data-uw-rm-heading=\"prs\">P8 Probe<\/h2>\n<p><span>The 122 Interface Meter uses the P8 Probe, which is 16 mm (5\/8&#8243;) in diameter and stainless steel. It is pressure proof the full length of the submerged tape. The beam is emitted from within a Hydex cone-shaped tip. The tip is protected by an integral stainless steel shield, and is excellent for the vast majority of product monitoring situations.   <\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2026\/07\/122-interface-meter-probe-with-zero-point.webp&#8221; alt=&#8221;technical diagram showing a close up of a stainless steel Solinst Model 122 interface meter probe highlighting the zero point at the tip of the conductivity pin&#8221; title_text=&#8221;Model 122 Interface Meter Probe Zero Point Detail&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;3676f7e6-7b83-4698-94ce-2cc9fa9ae43d&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;research article&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2 data-uw-rm-heading=\"prs\">Laser-Marked Flat Tape<\/h2>\n<p>The flat tape is extremely accurate, traceable to NIST and EU measurement standards.<\/p>\n<p>The easy-to-read markings on the 10 mm (3\/8&#8243;) flat tape are permanently laser-marked. The dog bone shaped tape avoids adherence to wet surfaces in wells. It is resistant to most chemicals, and the smooth surface of the tape is easy to decontaminate and easy to handle.  <\/p>\n<p><strong>LM2:<\/strong><span> <\/span>Feet and tenths: with markings every 1\/100 ft.<br \/><strong>LM3:<\/strong><span> <\/span>Metres and centimetres: with markings every mm.<\/p>\n<p>[\/et_pb_text][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2026\/07\/122-interface-meter-lm2-lm3-tapes.webp&#8221; alt=&#8221;technical diagram displaying two types of Solinst laser marked engineering flat tapes with top LM2 tape in feet and tenths and bottom LM3 tape in metres and centimetres&#8221; title_text=&#8221;Model 122 Interface Meter Laser Marked Tape Specifications&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column_inner][\/et_pb_row_inner][\/et_pb_column][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Adobe Analytics Code&#8221; _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||4px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_code admin_label=&#8221;AA Code for this page&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<!-- SiteCatalyst code version: H.21. 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**************\/<!-- [et_pb_line_break_holder] -->var s_code=s.t();if(s_code)document.write(s_code)\/\/--><\/script><!-- [et_pb_line_break_holder] --><script language=\"JavaScript\" type=\"text\/javascript\"><!--<!-- [et_pb_line_break_holder] -->if(navigator.appVersion.indexOf('MSIE')>=0)document.write(unescape('%3C')+'!-'+'-')<!-- [et_pb_line_break_holder] -->\/\/--><\/script><!-- [et_pb_line_break_holder] --><noscript><!-- [et_pb_line_break_holder] -->  <a href=\"https:\/\/www.omniture.com\" title=\"Web Analytics\"><!-- [et_pb_line_break_holder] -->    <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/solinst.d2.sc.omtrdc.net\/b\/ss\/solinst-prod\/1\/H.21--NS\/0\" height=\"1\" width=\"1\" border=\"0\" alt=\"\"><!-- [et_pb_line_break_holder] -->  <\/a><!-- [et_pb_line_break_holder] --><\/noscript><!-- [et_pb_line_break_holder] --><!--\/DO NOT REMOVE\/--><!-- [et_pb_line_break_holder] --><!-- End SiteCatalyst code version: H.21. -->[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p><div class=\"et_pb_module dsm_breadcrumbs dsm_breadcrumbs_0\">\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t<div class=\"et_pb_module_inner\">\n\t\t\t\t\t<nav class=\"dsm_breadcrumbs_wrap\">\n\t\t\t\t<ul class=\"dsm_breadcrumbs\" itemscope itemtype=\"https:\/\/schema.org\/BreadcrumbList\">\t\t\t<li class=\"dsm_breadcrumbs_item dsm_home_item dsm_home_item_custom\" itemprop=\"itemListElement\" itemscope\n\t\t\titemtype=\"https:\/\/schema.org\/ListItem\">\n\t\t\t\t<a href=\"https:\/\/www.solinst.com\/en-gb\/\" itemprop=\"item\" target=\"\">\n\t\t\t\t\t<span class='dsm_home_text_wrapper'>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"et-pb-icon dsm_home_icon\">\ue009<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"dsm_home_text\" itemprop=\"name\">\n\t\t\t\t\t\t\t\tHome\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t<\/a>\n\t\t\t\t<meta itemprop=\"position\" content=\"1\" \/>\n\t\t\t<\/li>\n\n\t\t<li class=\"dsm_breadcrumbs_separator\"> <span class=\"et-pb-icon dsm_separator_icon\">5<\/span><\/li><\/ul>\n\t\t\t<\/nav>\n\t\t\t\t<\/div>\n\t\t\t<\/div> &nbsp; Accurate Water Level Data Reliable Instruments that Last&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<div class=\"et_pb_module dsm_icon_list dsm_icon_list_0\">\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t<div class=\"et_pb_module_inner\">\n\t\t\t\t\t<ul class=\"dsm_icon_list_items dsm_icon_list_ltr_direction dsm_icon_list_layout_vertical\"><li class=\"dsm_icon_list_child dsm_icon_list_child_0\">\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t<a href=\"https:\/\/www.solinst.com\/products\/data\/122.pdf\" target=\"_blank\"><span class=\"dsm_icon_list_wrapper\"><span class=\"dsm_icon_list_icon\">\uf1c1<\/span><\/span><span class=\"dsm_icon_list_text\">122 Interface Meter Datasheet PDF<\/span><\/a>\n\t\t\t<\/li><\/ul>\n\t\t\t\t<\/div>\n\t\t\t<\/div>Model 122 Interface Meter Solinst Oil\/Water Interface Meters give clear and accurate measurements of product level and thickness in wells and tanks. Determination of both light (floating) non-aqueous phase liquids (LNAPL) and dense (sinking) non-aqueous phase liquids (DNAPL) is quick and easy. The factory-sealed probe is pressure proof (up to 500 psi) and tapes are available in a range of lengths from 30\u2013300 m (100\u20131000 ft). The 16 mm (5\/8&#8243;) diameter probe allows easy access through tight spaces and into narrow wells. The probe is designed for use in various monitoring applications. 122M Mini Interface Meters also available, see 122M Data Sheet for more information. Hazardous Locations Use Model 122 Interface Meters have been approved for use in explosive environments. They are suitable for use in hazardous locations Class I, Div 1, Groups C&#038;D based on standards of the Canadian Standards Association (CSA). The Model 122 Interface Meter with laser marked [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":260246,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"folder":[595],"class_list":["post-266973","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Interface Meters, Interface Probes, Hydrocarbon Detection, Oil-Water Interface Meters, Oil-Water Interface Probes<\/title>\n<meta name=\"description\" content=\"Solinst oil-water interface meters use narrow 5\/8&quot; dia. interface probes for hydrocarbon detection, LNAPL and DNAPL.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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