Go to Navigation Go to Content

H2s & CO2 Dual Gas Analyzer

Model PT605 Series Dual H2S & CO2 Analyzer is designed for continuous measurement of hydrogen sulfide and carbon dioxide in process gas streams. The unit is available in various low and high range of measurements. The unit is cost effective yet highly accurate and reliable.

The system uses latest in microprocessor and signal conditioning technology. On board interface module provides 4-20mA analog output, three (3) fully programmable alarm relays and RS-485 serial port.

A large LCD display with back light and push button switches on the front panel are provided for easy user interface.

Also available are real time clock and extended flash memory for historical data logging.

The analyzer is rated for Class I, Division 1, Groups B,C,D (explosion proof).

View Data Sheet   Technical Specifications


  • Gas Processing Facilities
  • Natural Gas Pipeline
  • Chemical Plants
  • Gas Well Testing & Analysis
  • Landfills & Biogas

Key Features

  • LCD display with back light
  • Easy automated Calibration
  • Field Replaceable Sensor Assembly
  • 3 Programmable Alarm Levels
  • Linear 4-20mA Output
  • Optional Historical data logging

Technical Specifications

Sensor Type

H2S: Electrochemical
CO2: Non-dispersive Infrared

Measuring Range

  0 - 25 ppm, 0 - 50 ppm, 0 - 100 ppm

0 - 0.5 % (5000 ppm)

0 - 5 %, 0 - 10 %, 0 - 50 %
Other high range H2S available

Accuracy / Repeatability

± 2 ppm or ± 10% of reading, whichever is greater.

Response Time

Sample & Purge. Samples process gas every 3 minutes for accurate analysis. Purges the sampling system with fresh ambient air for next sample.

Optional: Continuous flow method is also avail- able. Sample and Purge method is recommended of accurate analysis of the sample gas.

Typical Response: T50 < 25 seconds

Electrical Classification

Explosion Proof Instrument Enclosures Class I, Division 1, Group B,C,D

Nema 4X Cabinet for Environment protection. Stainless steel or Fiberglass.

Operating Temperature Range (Electronics)

-22°F to +149°F (-30°C to +65°C)

Process Gas Physical Properties

Liquid and Particle free
Gas Temperature:

  10°F to +110°F (4°C to +50°C)

Inlet pressure:

  Max. 2000 psig
  Min. 10 psig

Power Input

18 - 28 VDC

120 VAC (220 VAC Optional)

Power Consumption

< 4 Watt

Display and Indicators

4 Lines x 16 character LCD display with back light

Alarm Relays

3 Fully Programmable Low and High Alarms & Fault Alarm

SPDT Form "C" Relays
5 A @ 250 VAC or 30 VDC

Analog Output

Dual Channel Linear 4-20 mA output for H2S & CO2

Fault: 0 mA
Over Range: >21 mA

Digital Output

Half Duplex RS-485 MODBUS
RTU Protocol

Input/Output Protection

Transient over voltage suppressor
Reverse Polarity protection
EMI / RFI Immunity


Height: 36 inches ( 914 mm)
Width: 24 inches ( 609 mm)
Depth: 10 inches ( 254 mm)


60 Lbs (27 Kg)


Filters and liquid trap
Sampling Probe

Cable Entry & Wiring

3/4" NPT Female
User connection box with plug-in terminals.
Wire size 14 AWG (max)


Two year Electronics
CO2 Sensor Assembly: 2 Years
H2S Sensor Assembly: 6 months


Back To Top