Thermo Fisher THERMO-FID FID Detector Unit

Module Feature

THERMO-FID is Thermo Fisher heated flame ionization detector module, widely used in CEMS continuous flue gas monitoring and online VOC / non-methane hydrocarbon measurement.

The detector cell adopts constant temperature heating structure to prevent moisture condensation inside the measuring chamber. It supports hydrogen fuel and zero air supply, has high sensitivity for organic hydrocarbon, wide linear range. It integrates ignition coil, flame loss detection circuit, flow monitoring and signal amplifier. It can be matched with Thermo 51i / 55i series hydrocarbon analyzer host. Widely used in power plant, waste incineration, petrochemical flue gas emission compliance monitoring.

Working principle

Sample gas enters hydrogen flame, organic hydrocarbon molecules are cracked and ionized under high temperature flame.

Ion collector captures charged ions and generates weak current signal proportional to hydrocarbon concentration. The amplifier converts the micro current into standard analog signal. Once flame extinguishes, the system automatically cuts off hydrogen supply and triggers safety interlock alarm.

Onboard components

Heated detector chamber, ignition electrode, ion collecting electrode, solenoid control valve, flow restrictor, temperature sensor, signal amplification board, flameout detection circuit, gas fitting ports.

LED indicators

Status indicator is on matched analyzer controller, showing power, flame normal, measuring, low fuel and fault alarm.

Hardware self‑diagnosis

Self-check covers flame loss, fuel flow abnormal, heating temperature deviation, signal drift and circuit fault. It will automatically shut off hydrogen gas for protection.

Programming software

Thermo instrument configuration software for zero / span calibration, temperature setting and fault log reading.

Electrical & Process Parameters

Model:THERMO-FID Brand:Thermo Fisher Device type:Heated Flame Ionization Detector Detection target:Total hydrocarbon, NMHC Fuel:Hydrogen + Zero Air Function:Online organic hydrocarbon concentration measurement for CEMS and analytical instruments

Mechanical & Structure

Mounting:Install inside analyzer cabinet Protection class:IP40 Housing:Heated metal detector block

Environmental

Operating temperature:5℃ ~ +45℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:CE, EPA compliant Status:Thermo Fisher original analytical detector spare

Installation

Install detector module in heated sampling path, keep sample pipeline heat tracing to avoid condensation.

Connect hydrogen, zero air and sample gas pipelines correctly. Complete zero gas and span gas calibration after ignition. Regularly clean nozzle and collector electrode according to maintenance schedule.

Interface

Sample gas inlet, hydrogen fuel port, zero air port, exhaust port, signal output port, power and temperature control terminals.

Diagnostic

No signal and flame out: Hydrogen pressure insufficient, nozzle blocked, ignition electrode contaminated.

Measurement drift: Collector fouling, sample moisture condensation.

Over temperature fault: Heater or temperature sensor failure.

Product BriefThermo Fisher THERMO-FID heated FID detector, for total hydrocarbon and NMHC monitoring, flame loss safety interlock, used for CEMS flue gas continuous emission monitoring.