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RKI Instruments EC-500 Controller and Detector for Carbon Monoxide (CO), 0 - 150 ppm - 73-1201RK

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RKI Instruments EC-500 Controller and Detector for Carbon Monoxide (CO), 0 - 150 ppm - 73-1201RK

RKI Instruments EC-500 Controller and Detector for Carbon Monoxide (CO), 0 - 150 ppm - 73-1201RK


73-1201RK EC-500 Controller and Detector for Carbon Monoxide (CO), 0 - 150 ppm by RKI Instruments

RKIís Model OX-500 is an indoor monitor that detects Oxygen (O2) levels with a range 0-25.0 % Volume (0.1 % Vol. digit). Itís a sleek low profile design which lends itself to laboratory or commercial applications. The OX-500 comes ready to operate with a simple wall mount bracket and 10 foot power cord. If Oxygen level drops, the user is notified by an audible alarm tone and multicolored LED display.

The OX-500 uses a fast responding low-cost plug-in style galvanic cell sensor. This long life sensor is field-replaceable with no special tools required. An optional remote sensor is available in lengths of 3m, 5m, 10m, and 20m.


  • Compact, wall mounting design
  • Highly visible 3 color LED digital display
  • Remote cable can enter from any direction
  • Stores alarm summary data (10 alarm occurrence, time and alarm concentration)


  • Prevent oxygen deficient accidents
  • Control oxygen levels
  • Laboratories
  • Warehouses
  • Tunnels
  • Clean room
  • Basements

*Please note we can only ship RKI products to customers within the United States

OX-500 Specifications:
Measuring Gas Oxygen (O2)
Sampling Method Diffusion
Detection Principle Galvanic cell
Measuring Range 0-25.0 % Vol. (0.1 % Vol. digit)
Display 3 digits, 3 color LED (Green, Orange, Red) Normal: Green
Type of Alarms Gas alarm: 2 level alarm (Latched mode / cancelled by reset switch)
Trouble alarm: Sensor connection trouble (Non-latched mode)
Preset Alarm Levels 1st: 19% Vol., 2nd: 18% Vol.
Display of Alarm 1st Alarm: Flashing orange LED gas display
AL1 LED orange color flashing, intermitted buzzer sound
2nd Alarm: Flashing red LED gas display
AL2 BED red color flashing, continuous buzzer sound
Trouble Alarm: Red flashing display "E-**" (**shows error number), short buzzer intermittent buzzer sound
Alarm Summary 10 alarm occurrences, time and alarm concentration
Output 4-20mA ADC
Alarm Relays AL1 / AL2 Form A common, contact capacity: 125V 1A (Resistive load)
Operating Temp. & Humidity 0-40ºC (0-104°F), below 90% RH (non-condensing)
Power Requirement 100 VAC, 50/60Hz, Power consumption: Max 3.5VA, Power cable: 3m accessory (standard)
Option: (DC 24V, Power consumption: MAX 2.0 W<Special version>)
Dimensions Approx. 95(W) x 135(H) x 35(D)mm
Weight Approx. 420g (Approx. 220g in case of DC 24V version)
Mounting Wall mounting type (by using accessory mounting plate or mount at one switch box)
Cable inlet: Up, down and left/right, or rear side

Symptoms of O2 Deficiency:
O2 Symptoms
23.5% OSHA limit for increased levels of oxygen
20.9% Oxygen content in normal air
19.5% - 12% Increased pulse and respiration
12% - 10% Disturbed respiration, fatigue, faulty judgment
10% - 6% Nausea, vomiting, inability to move, loss of consciousness and death
6% - 0% Convulsions, cardiac arrest and death

Questions & Answers

1 Question & 0 Answers
Maggie Young
from Oakland, CA asked:
March 13, 2014
Hi, what is the return policy on this product?