A perfect low cost solution for hydrogen detection in battery rooms, or for LEL or PPM level detection of a variety of flammable or solvent vapors in general industry.

The Model PS 2 is a multipurpose gas monitor utilizing a MOS (metal oxide sensor) for long lasting and low maintenance detection at the LEL or PPM levels of many gases or vapors. The PS 2 has two alarm levels for increasing gas or vapor levels, at the PPM level for detection of many solvent vapors, or for LEL level detection of flammable vapors. Inquire at the factory for your specific requirement. Each alarm level activates a 12 amp relay inside the unit, and terminals are provided for wiring the relay to activate an external alarming device or some other device such as a ventilation fan.

This stand alone unit is housed in a durable plastic enclosure with flanges provided for wall mounting and is designed with easy access wiring hubs on the bottom of the unit. The front of the PS 2 contains three lights; Pilot, Alarm 1, and Alarm 2. An internal audible alarm (85 db) is also built in which activates in a gas alarm condition.

The standard PS 2 is supplied with the gas sensor located on the end of a 30 foot cable (other cable distances are also available). Each unit is powered by 115 VAC standard or 24 VDC as standard (48 VDC versions optional), and the AC version comes complete with a 6′ power cord.


LEL or PPM detection ranges available for many gases
2 alarm levels
Stand alone system
Input voltages: 115 VAC standard, 24 VDC or 48 VDC (optional)
Audible and visual alarms
Compact design
Simple installation
AC version equipped with power cord
Relay contacts rated 12A @ 115 VAC
Low maintenance


Battery storage locations
Petrochemical plants
Water & wastewater treatment plants
Gas, telephone, & electric utilities
Manufacturing facilities



General Specifications

Relays12 amp rated contacts for each alarm
Audible85 db alarm at 10 cm
VisualAlarm 1: Orange LED Alarm 2: Red LED
Operating Temp35°F to 120°F (2°C to 49°C)
Relative Humidity10 - 95% RH, non condensing
DimensionsHeight: 6.85” 174 mm Width 6.48” 165 mm Depth 3.30” 84 mm
EnclosureABS plastic, indoor housing
Sensor TypesMetal Oxide Semiconductor type (MOS)
Measuring RangesLEL levels available for many gases. Typically set to 10% LEL for alarm 1, and 25% or 30% LEL for alarm 2 (Highest possible setting is 30% LEL).
Sensor ConnectorSensor is connected to 30ʼ extension cable wired to terminals inside unit. Cable length can be decreased or increased as needed.
Power and Warranty
Power24 VDC (standard) 115 VAC or 48 VDC (optional)
WarrantyOne year materials and workmanship
Partial List Of Detectable Gases
Many other gases available.Contact RKI for gases not listed
Ethyl AlcoholC2H5OH
Isopropyl Alcohol(CH3)2CHOH

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