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Fixed Gas Detection

GM-600 Ethylene Oxide Detector

Standalone Ethylene Oxide Monitor

The Riken Keiki GM-600 is an indoor stand-alone Ethylene Oxide (EO) monitor.

Ethylene Oxide is used for the Sterilization of hardware and is extremely toxic . Staff working in Sterilization facilities must have early warning of any leaks.

Using the GM-600 allows users to have advanced warning of any Ethylene Oxide leaks should they occur.

Users find the compact and lightweight GM-600 very easy to use and install in addition users can mount the monitors at staff eye level.


Product Features

Visual and Audible Ethylene Oxide Alarms:

The GM-600 has a display that changes colour at each alarm level. This is a unique feature of the Riken Keiki  600 series of instruments.

The Unit comes with  preset alarms set to High and High High. Users can program their own alarm levels if desired.  Users can access relay outputs for 1st and 2nd alarms in addition to a 4-20mA output. These features allow customers to connect optional external accessories such as such as additional sounders and beacons.

The Instrument comes ready to operate with a 24 VDC Power supply.  An optional 240VAC Main adapter is also available.

Sensor Technologies :

The GM-600 has a highly sensitive semiconductor sensor.

Remote Ethylene Oxide ( EO ) Sensor:

The GM-600 comes complete with a 3m extender cable allowing users to be mount the monitor outside the room with the sensor inside. This protects staff, allowing users to ascertain the state of the room prior to entry.

Customers can specify optional extras that include a Battery backed UPS ( WPSU24 Series)  in addition to sounder beacon(s) (SB-100 ) .

Customers of the GM-600 are those using Ethylene Oxide Sterilization autoclaves in addition to Research Laboratories.

The GM-600 is a member of the 600 series of standalone monitors in addition the 600 Series family also includes OX-600, EC-600 and RI-600

The GM-600 is a high performance cost effective solution when Ethylene Oxide monitoring is required.


Model Name GM-600
Detection Principle Semiconductor Method
Gas Detected Ethylene Oxide ( EO)
Sampling Method Diffusion or remote sampling method with optional extender cable
Gas Alarm Contact No-voltage contact 1a or 1b and normally de-energized ( energized in response to an alarm )
Fault alarm pattern Auto-reset
Alarm Levels Two preset alarms (H-HH), alarm 1 = 10ppm , alarm 2 = 50ppm
Display of Alarm 1st gas alarm: , flashing AL1 light or orange light, buzzer
2nd gas alarm: , flashing AL2 light or red light, buzzer
Alarm Method Latching or Non-latching
Alarm Contact Dry contact, Form A or Form B, Form A standard Factory Setting, normally open (closed in ALARM)
Display Digital LCD (5 digits, 7 segments / Green, Orange, Red) ( back light will be OFF during normal operation)
Trouble Alarm / Self-Diagnosis System trouble / sensor connection trouble
Display of Trouble Alarm Buzzer / content indication (flashing of orange error message)
Trouble Alarm Method Non-latching or Latching
Contact Capacity 125VAC, 1A or 30VDC, 1A (Resistive load)
Output Signal 4 ~ 20mA (Non-isolated, Resistive load under 300O)
Remote Extender Cable 3M Extender cable with remote sensor head
Power Sources 24VDC±10%, ( 240VAC adapter available )
Power Consumption 24VDC specification: MAX 4W
Gas Alarm pattern Auto-reset
Initial Clear About 25 seconds
Operating Temperature 0°C ~ 40°C (no sudden change)
Operating Humidity Below 90%RH (non-condensing)
Mounting Equipment Wall mounting, sensor integrate type or remote type
Dimension Body: approx. 80mm(W) x 120mm(H) x 35.5mm(D) / 3.15”(W) x 4.72”(H) x 1.2”(D)
Remote sensor (exclude the protrusion): approx. 40mm(W) x 96mm(H) x 35.5mm(D) / 1.57”(W) x 3.78”(H) x 1.2”(D)
Weight 24VDC specification: approx. 180g (6.34 oz), Remote sensor: approx. 55g (1.94 oz) (excluding cable)
*Under normal conditions

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