2. Toxalert
  3. GVU-CO

Toxalert GVU-CO Calibration Procedures

  • Hello! I've reviewed the user manual for the GVU-CO and GVU-2R CO sensors. This manual provides detailed instructions on how to calibrate these sensors, including the required tools and step by step procedure for calibration using calibration gas and adjusting the potentiometer for correct LED indication. I'm ready to answer any questions you have about the calibration process or the use of these sensors.
  • What is the recommended calibration gas concentration?
    How long should the sensor be powered before calibration?
    What is the recommended flow rate during calibration?
    How do I know when the sensor is calibrated?
GVU-CO & GVU-2R CO SENSOR CALIBRATION SET-UP
TOOLS REQUIRED:
• Tank of calibration gas (usually 50 ppm CO)
• Valve, regulator, gauge, and orifice assembly
• Small flat screw driver
PROCEDURE:
Kit assembly-
1. Fill water bottle half full of tap water.
NOTE: MAKE SURE THAT WATER BOTTLE IS BELOW SENSOR SO
THAT WATER IS NOT FORCED INTO CO SENSOR
2. Screw the valve, regulator, gauge, and orifice assembly on to the tank of
calibration gas.
3. Insert 1/4" plastic tubing (with orifice in line) into remaining barb fitting on
water bottle.
4. Press the sensor calibration cover inside the sensor shield for a snug fit.
NOTE: GVU-CO & GVU-2R ARE THE SAME SENSOR & USE SAME PROCEDURE
Calibration-
NOTE: Sensor must be continuously powered for 72 hours prior to calibration
1. Slowly open tank valve.
2 . Adjust pressure gauge to read 25 psi (lift regulator knob to adjust). This sets
the flow rate to 0.2 LPM, the minimum flow rate, via the purple orifice.
3. Allow gas to flow for at least 2 minutes.
4. If the LED is blinking green insert screwdriver into R6 hole of sensing unit
and turn pot counter clockwise (CCW) until LED just changes to blink red.
Turn R6 clockwise (CW) until LED goes to blinking green, then turn R6
CCW until LED just turns red. Unit is calibrated and LED should be blinking
red.
5. Remove calibration gas and turn off the tank valve.
6. Reinstall plug into pot R6 access hole. Sensor will return to blinking green in
a short time.
QUARTERLY CALIBRATION IS RECOMMENDED
TANK
VAVLE ON/OFF
REGULATOR ADJ. KNOB
PRESSURE GAUGE
ORIFICE (purple)
SET TO 25.0 PSI
co gas
LED
POT R6
ACCESS
mixing valve
DO NOT ADJUST
calibration cover
sensor shield
water bottle
TOXALERT INTERNATIONAL, INC. PO BOX 159 MOUND, MN 55364 rev 01/06
www.toxalert.com 952-472-4541 Phone
[email protected] 952-472-4960 Fax
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