Water & Effluent Treatment

Biogas Digester & Flare Stack

Monitor digestion, gas handling, and flare-system operating conditions.

Measures: Gas flow · Pressure · Temperature · H2S · Foam & level viewing

Used in:Water / Wastewater

Diagram of the measuring points in a biogas digester & flare stack

1 2 3 4 5 6 7 8 9 10 11

Click a number to jump to that measuring point. Conceptual view, not for installation design.

Pressure Gauges

Measures internal digester pressure, crucial for safety and process efficiency.

Miljoco P4098LY-SS Industrial Gauge4" Stainless Steel; 1% accuracy 1A; Dry, Glycerine, or Silicone Fill

Miljoco P6098LY-SS Industrial Gauge6″ Stainless Steel Industrial Gauge 1A; Dry, Glycerine, or Silicone Fill

Miljoco P4520L Process Gauge4 1/2″ Process Gauge; Accuracy: 1/2%, Grade 2A; Dry, Glycerin, or Silicone

Weiss LF442Z Liquid Filled Pressure Gauge, Zytel Nylon Case4″ 316 SS Gauge; Vacuum/compound to 10 000 psi, 1 % Grade 1A accuracy.

Weiss NF602 Dry Pressure Gauge, Stainless Steel Case6″ SS Gauge; Vacuum/compound to 15 000 psi, 0.5 % Grade 2A accuracy (¼″ NPT).

Weiss NF402 Series 4" Industrial Gauge with 304 SS Stainless Steel Case4″ stainless industrial gauge; liquid filled; 0‑1000 psi; 1 % accuracy

Gas Flow Meters

Measures biogas flow from the digester to the flare, optimizing flare operation and efficiency.

ST100A Flow MeterST100A is high performance thermal dispersion technology gas flow meter that combines the most feature- and function- rich electronics, and FCI innovations such as Adaptive Sensing Technology™ (AST), with the industry’s most advanced…

ST80 Flow MeterST80 is a high performance, rugged thermal dispersion technology air/gas flow meter that combines ultra-reliable, feature-rich electronics, and FCI innovations such as Adaptive Sensing Technology™ (AST) with the industry’s most…

ST75 Flow MeterThe ST75 Series thermal flow meters are a compact, low cost solution for accurate, repeatable direct mass flow measurement of air and gases. These in-line (spool-piece) style flow meters have no moving parts and are available for use in…

ST51 Flow MeterThe Model ST51 and ST51A are a compact, low cost solution for accurate, repeatable flow measurement of biogas, digester gas, landfill gas, methane and natural gas as well as air, compressed air or nitrogen. This insertion-style flow…

Flow Conditioner

Conditions biogas flow before measurement, ensuring accurate readings for flare management.

VIP Flow ConditionerThe patented* VIP (Vortab Insertion Panel) flow conditioner completely neutralizes

Flow Switches

Detects biogas flow to the flare, verifying operation and preventing uncombusted gas release.

FS10i Flow MeterThe FS10i is a compact, economical solution to air and compressed air flow metering. It is the first, and currently only, thermal mass flow meter to meet SIL 2. Utilizing application proven thermal mass flow technology, the FS10i…

FCI FS10A Analyzer Flow Switch + MonitorLow‑Flow Switch & Monitor for Analyzer Lines; ±2 % Setpoint

FLT93 Thermal Dispersion SwitchFCI’s FLT93 Series are the most popularly installed heavy duty thermal dispersion flow and level switches in the world. The reasons are simple; FLT93s were developed from more than 40 years of flow and level switch engineering and…

Differential Pressure Switches

Monitors pressure differences in gas lines, indicating blockages or flow issues for safety.

Dwyer 1950G Explosion-Proof Differential Pressure SwitchOne SPDT Relay; 1/8" FNPT; Weather Proof; Dry Gases

Temperature Sensors & Transmitters

Measures biogas temperature for process control and to ensure optimal flare combustion.

Dwyer Series TTE Explosion-Proof RTD Temp Transmitter, -30 to 250 °F, Easy Adjust, Offshore HVACExplosion‑Proof RTD Temperature Transmitter; 4‑20 mA Output

Flanged Magnetic Flowmeters

Measure raw sludge and digestate flow to optimize digester loading and monitor output.

Dwyer FMG490 Series Magmeter w/Remote Display and Pulse & Optional 4 to 20 mA OutputFlanged magmeter with remote display; pulse & optional 4‑20 mA

Dwyer FMG480 Series Magmeter with Integrated Display, Pulse & 4 to 20 mA OutputEconomical flanged magmeter; 3‑12″ sizes; pulse & 4‑20 mA outputs

Differential Pressure Transmitters

Measures pressure differentials in the flare system, indicating flow and combustion efficiency.

Dwyer Series-3100D Smart Differential Pressure Transmitter, HART®, Hazardous AreaSmart Differential Pressure Transmitter; HART®, Hazardous Area Rated

Methane Detectors

Detects methane near the digester and flare, ensuring safety and preventing gas leaks.

Dynament Low Power Dual-Gas Methane/Carbon Dioxide Infrared sensorsLow‑Power Dual‑Gas IR Sensor; Battery Friendly, CH₄/CO₂

Dynament Standard Series - Hydrocarbon Infrared SensorsStandard IR Hydrocarbon Sensor; 4-20mA output, Measures CH₄ from 0‑100%v

Dynament Dual-Gas Methane/Carbon Dioxide Infrared sensorsDual‑Gas IR Sensor; Measures CH₄ + CO₂ Simultaneously

Dynament Platinum Series - Hydrocarbon Infrared Gas SensorsPlatinum IR Hydrocarbon Sensor; Measures CH₄ from 0‑100%v

Dynament FGD10A Flameproof Fixed Gas DetectorsEx d gas detector with 3 alarm relays; non-intrusive mag-pen menu; detects hydrocarbons, hydrogen, or toxic gases.

Dynament FGD10B Flameproof Fixed Gas DetectorsEx d gas detector in IP65 aluminium / SS housing; accepts plug-in handheld configurator; detects hydrocarbons, hydrogen, or toxic gases.

H2S Analysis

Electrochemical H2S analysers measure hydrogen sulphide in the biogas before and after the H2S scrubber, so the scrubber is working before the gas reaches engines or boilers.

AII GPR-7100 Hydrogen Sulphide (H2S) Analyzer4-20 mA analog output; Hazardous Area certified

AII GPR-7500 (A)IS Hydrogen Sulphide (H2S) Analyzercertified for use in flammable gas streams; 4-20 mA output, 0-2000 ppmV

Digester Viewing & Foam Monitoring

A process camera with its own lighting looks into the digester through a single flanged nozzle, so operators can watch the liquid and foam level from the control room and dose antifoam before foam reaches the gas outlet.