This website uses cookies which are essential for it to function. In addition, we may use cookies to help improve the performance and user experience of our website. If you prefer to switch off all cookies, you can do so using your browser settings but the functionality of this website may be affected. Please accept or decline any non-essential cookies and see our Privacy Policy for full details and guidance.

Fixed Gas Detection

RI-600 Industrial Carbon Dioxide (CO2) Enrichment Monitor

Standalone Carbon Dioxide (CO2) Detector with alarm Relay contacts and 4-20mA output

The Riken Keiki RI-600 is an indoor stand-alone Carbon Dioxide (CO2) monitor. When Carbon Dioxide(CO2) leaks into a room it will displace Oxygen (O2). This results in Oxygen deficiency.  In addition Carbon Diixode (CO2) is highly toxic in its own right.

The use of Carbon Dioxide (CO2) Monitors is extremely important as even small amounts of Carbon Dioxide (CO2) can cause death long before Oxygen (O2) Deficiency does.

The Carbon Dioxide (CO2) LTEL is 5,000 ppm or 0.5% volume.  In otherwise fresh air, the oxygen channel will read 20.8 % volume, instead of 20.9% volume – nowhere near an asphyxiation hazard alarm. In fact, the STEL for Carbon Dioxide (CO2) is 1.5% volume, so even if the Carbon Dioxide (CO2) level reaches that point, it will only cause a reading of 20.6 % volume oxygen. So even when there is an immediate danger from the Carbon Dioxide (CO2), the oxygen reading is still far away from an alarm condition.

RI-600 remote sensor

Product Features

Visual and Audible CO2 Alarms:

The RI-600 displays CO2 levels on an LCD screen that changes colour at each alarm level. This is a unique feature of the Riken Keiki  600 series.

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.

Optional extras that include a Battery backed UPS ( WPSU-24 Series ) and additional sounder beacon(s) ( Accessories ) are available.

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

Sensor Technologies :

The RI-600’s Sensor is highly accurate and extremely long lived. It uses Non-Dispersive Infrared Ray Absorption ( NDIR) technology to achieve this.

The RI-600 comes with a measurement range of 0-5% Volume OR 0-10000ppm. Users can program levels for 0-2% or 0-2000ppm or 0-5000ppm if required.

Remote Carbon Dioxide ( CO2 ) Sensor:

An extender cable allows the unit to be mounted outside the room with the sensor inside. This allows users to ascertain the state of the room prior to entry.

Laboratories, Breweries, Greenhouses, Underground car parks in addition to Office buildings and conference rooms are applications that can benefit from CO2 Monitoring

The RI-600 is a member of the 600 series of standalone monitors which include OX-600 Oxygen (O2) Monitor, EC-600 Carbon Monoxide (CO) Monitor and GM-600 Ethylene Oxide Monitor 

The RI-600 is a high performance cost effective solution when CO2 monitoring is required.

 Accessories available include Additional Sounder Beacons and Battery backed power supplies.


Model Name RI-600
Detection Principle Non-Dispersive Infrared Ray Absorption (NDIR)
Gas Detected Carbon Dioxide ( CO2)
Detection Range 0 ~ 5% Vol OR 0-10000ppm (0~2% vol , 0-2000ppm and 0-5000ppm user programmable options )
Display Resolution 0.005 ~ 0.01 vol% OR 1ppm ~10ppm
Sampling Method Diffusion or remote sampling method with optional extender cable
Indication Accuracy* Within ±5% for full scale
Response Time* 90% Response within 60 seconds
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 = 1.0% vol, alarm 2 = 1% vol (other settings available) OR alarm 1 = 1000ppm , alarm 2 = 1000ppm ( can be programmed to other levels at users request)
Display of Alarm 1st gas alarm: gas concentration reading blinks or orange light, flashing AL1 light or orange light, buzzer
2nd gas alarm: gas concentration reading blinks or red light, 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 Extender cable with remote sensor head (3m, 5m, 10m or 20m lengths available)
(cable used: EM-MEES (o.5sq), 2-core)
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

Interested in this product?

We are able to provide products and advice usually within short timescales. For product advice, servicing and enquiries, please contact our experienced team:

Enquire Now