CARBON MONOXIDE SENSORS
KCO SERIES
GAS & SPECIAL
TY SENSORS
2008 KELE CATALOG • www.kele.com • USA 888-397-5353 • International 901-382-6084
195
GAS & SPECIALTY SENSORS
DESCRIPTION
KCO Series Carbon Monoxide Sensors are available
in analog or relay versions. The sensors are provided in
heavy-duty steel enclosures, and the sensors use low-
temperature components that are ideal for open parking
garages in cold climates.
FEATURES
• Two-stage alarming (KCO-R)
• 0-200 ppm 4-20 mA output (KCO-A)
• Microprocessor-controlled recalibration (KCO-A)
• Heavy-duty enclosures
• Operating temperature down to -4°F (-20°C)
• Low-temperature option available -20°F (-29°C)
• Temperature and humidity compensated
KCO-R
The KCO-R is a two-stage carbon monoxide sensor with a relay output for each stage. If the CO level rises above
the warning stage setpoint for over 30 seconds, the warning relay, amber warning LED, and a three-minute mini-
mum “on” timer will activate. Once below the setpoint, the relay and LED will reset. If the concentration continues to
rise and exceeds the alarm stage setpoint for 10 minutes, the alarm stage relay and red LED will activate.
Calibration of the unit requires the application of a hydrated test gas.
KCO-A
The KCO-A is a microprocessor-controlled sensor with a 4-20 mA analog output based on a 0-200 ppm sensing
range. The microprocessor controls the heating of the sensor and subsequent reading of the CO level. The micro-
processor compensates for any drift in the sensor over time. The microprocessor system includes self-diagnostic,
self-restarting, and remote failure reporting. The output signal will drop below 4 mA if a fault is discovered. If power
problems cause the unit to malfunction, the unit will self-check and restart. Calibration of the unit requires the appli-
cation of a hydrated test gas, and the push of a button performs the recalibration.
INSTALLATION
Note: Front covers are blank
KCO-R
Power
24 VAC/VDC ±20%, 260 mA
Power with LT option
1.125A
Indicators
Amber
Warning
Red
Alarm
Flashing green/red
Power on, microprocessor
operating
Warning stage delay
30 sec
Range
0-250 ppm
Response time
Under 30 sec
Relay contacts
120 VAC, 2A resistive
Setpoints
Warning 50 ppm, alarm 100
ppm (reset 5-10 ppm change)
KCO-A
Output signal
4-20 mA into 500
Ω
max
Scale
0-200 ppm carbon monoxide
Power
24 VAC ±20%, 10 VA
Power with LT Option
34 VA
Analog resolution
12 bit
Reading delay
10 minutes
KCO-R, KCO-A
Operating temp
-4° to 185°F (-20° to 85°C)
Sensor type
Solid-state metal oxide
semiconductor
Humidity
5% to 95% noncondensing
Enclosure dimensions 6.25"H x 6.125"L x 3"D
(15.9 x 15.6 x 7.6 cm)
Accuracy
±5%
Sensor drift
±10% 2 years
Sensor life
10 years
Weight
3.0 lb (1.4 kg)
Warranty
18 months
SPECIFICATIONS
KCO-A-H
KCO-R-H
