Tetrahydrothiophene Gas Detector (THT)

  • Sale
  • $945.00
  • Regular price $1,995.00

Model: FD-90A-THT
User Manual: Click Here
Blog Article: Click Here


  • 🗽 ACCURATE: Professional and accurate Tetrahydrothiophene (THT) gas detector, 0 - 50 mg/m3 with 0.1 mg/m3 resolution. Electrochemical sensor. 
  • 🚄 DETECT: Electrochemical cell sensor with accuracy: ≤ ± 10% F.S. and response time: T < 30 sec. Zero and span calibration options. 
  • 🎆 ALARMS: Adjustable audio, visual, and vibration alarms alert when preset levels are reached. 
  • 💪 STRONG: Shockproof, water-resistant, dustproof, and explosion-proof with belt clip.
  • 🕵️ TRUSTWORTHY: ** 1-year limited warranty ** Arrives with calibration and QA certificates ** Product tested and verified in the USA ** 

Details: A professional Tetrahydrothiophene (THT) gas detector by FORENSICS with advanced functions that comes factory-calibrated. Tetrahydrothiophene gas detectors (THT chemical formula is C4H8S) are used to prevent exposure to toxic or harmful THT gas concentrations.  Used for spot checks, restricted access, and personal safety. THT gas is utilized as an insecticide, a natural gas odorant, and a solvent in the chemical industry. High concentrations of tetrahydrothiophene exposure can cause headaches, dizziness, weakness, convulsions, and giddiness. Tetrahydrothiophene can give you stomach pain, diarrhea, and the flu. THT gas detectors are useful for anyone who may be exposed to Tetrahydrothiophene gas including anyone who will be in an environment where natural gas is present. Tetrahydrothiophene also is identified as Thiophene, Tetrahydro-, Thiophane, Thiolane, and Thiacyclopentane.

OSHA does not state any PEL or TWA for Tetrahydrothiophene gas. Neither does EPA, NIOSH, nor ACGIH. The only reference for Tetrahydrothiophene gas comes from the German body called the MAK Commission.

MAK values are derived by the “DFG Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area”, better known as the “MAK Commission”. This independent body has been mandated by the German Research Foundation (DFG) to determine the current state of research relating to the health risks posed by substances and materials used at the workplace and to advise public authorities accordingly.

MAK value = 183mg/m3 (50 ppm), peak limitation

Included: THT gas detector, belt clip, sling, English manual, USB charging cable, calibration cover, and calibration certificate. 

Calibration Kit (sold separately): 
Calibration Gas (H2S) Surrogate Gas 25ppm H2S: 10 mg/m3 THT is used for calibration. A H2S NIST gas standard is employed since none exists for THT.
Calibration Gas Regulator (C10)
Bump Gas (can use H2S)

Other Accessories (sold separately):  
Gas Detector Hard Case
Gas Detector Pouch
Gas Detector Stand
Gas Sensor Replacement (THT) (email us)

Calibration Service (sold separately):  
Gas Detector Calibration Service


Tetrahydrothiophene THT (C4H8S) detection: 0 - 50 mg/m3 with 0.1 ppm resolution
Accuracy: better than ± 10% F.S 
Response time: T < 30 sec
Indication: LCD indicates the time, concentration, temp, and battery state
Alarm: Indication of alarm, fault, and low voltage with LED, sound, and vibration
Operating temperature: 0F - 122F
Humidity: < 95% RH non-condensing
Operating voltage: DC 3.7V Li-battery 1500 mAh
Working time: > 24 hours
Charging time: 4 hours
Sensor life: 2 - 3 years
Recommended calibration period: 6-12 months
Protection category: IP65
Weight: about 130 g (including battery)