ACME GasPost - Model RS485 Series -Toxic Gas Sensor/Transmitter

The 4-20mA transmitter is designed for standard 2-wire loop-powered operation where the output is supplied via the same pair of wires as the power supply. The four-wire version of the GasPost is available for all other output signals other than 4-20mA.

The GasPost employs a range of diffusion-type electrochemical sensors capable of detecting a broad range of toxic and combustible gases. It provides instantaneous detection of accuracy and trouble-free operation.

Designed to act as fixed in-situ safety monitors, the GasPost transmitters automatically operate the mechanical ventilation system of a facility upon detection of hazardous gases, thereby protecting occupants, personnel, and gas-sensitive goods and products.

With the increased use of gas detection in maintenance and industrial facilities, the GasPost allows installers and users to meet code requirements in economical detection equipment.

The GasPost contains all the well-known standard features of ACME’s gas detection line; a robust enclosure, the latest sensor technology, and state-of-the-art electronics.

For more information about this product please click the Product Literature, Specifications, and or Application Request Form links provided on this page

• High-accuracy electrochemical cell sensor
• Two-wire, loop-powered 4-20mA analog output
• Optional 0-1V DC, 0-5V DC or 0- 10V DC analog output with
• 10-Step bar-graph display of gas levels
• NEMA 3 robust enclosure
• Microprocessor-based control
• Remote sensor/transceiver on a RS-485 communication network compatible with Acme’s popular CEL-Series centralized multipoint/multi-gas detection and control systems

• Energy savings through the intermittent operation of ventilation equipment in enclosed areas
• Commercial or industrial locations where a sudden build-up of toxic gases may occur
• Car parking and bus maintenance garages, tunnels, warehouses, etc.
• Food processing and bottling plants, wastewater treatment plants, steel mills, cryogenic laboratories, incineration rooms, etc.
• Stand-alone with standard analog outputs for direct connection to the existing Building Management System (BMS) or DDCS

• Gases detected: CO, NO2, O2, NH3, H2, H2S, CL2,SO2
• Sensor Technology: 3-electrode electrochemical cell
• Sensing Method: Diffusion
• Power Requirements:
• 18-36V DC strictly for the loop-powered 4-20mA model, 24V AC 50/60Hz for other models
• Outputs:
• 4-20mA
• 0-1V DC
• 0-5V DC
• 0-10V DC
• RS-485
• Operating Temp.: -4ºF to 104ºF (-20ºC to +40ºC)*
• Humidity Range: 15-90% RH
• Accuracy: +/- 5% of calibrated value
• Repeatability: 2% of signal
• Response Time (T90%): < 30 seconds
• Expected Lifetime: 7 years for CO only; 2 years for other gases.
• Enclosure:
• NEMA 3
• Cast Aluminum
• Surface mounting
• Dimensions: 7” x 5.25”x 2.25” (175mm x 131mm x 56mm)