Calibration Handbook
33VA301W Wireless Transmitter
301W Calibration Procedure
1. Warm-Up Period
Turn the unit on for a minimum of fifteen (15) minutes.
2. Connecting the Hardware
Screw the regulator to the appropriate calibration gas cylinder.
Adjust the regulator with a flow rate of according to specification
301W CALIBRATION INFORMATION
Gas Scale Warm-up Flow Rate Notes
CO 0 - 255 ppm 15 min 0.5L/min
NO
2
0 – 10.2 ppm 15 min 1L/min
O
2
0 – 25.5 % Vol. 15 min 0.5L/min
Connect the regulator outlet to the sensor as shown.
3. Remote Calibrating the 301W Sensor
When using the 301W in a network of sensors, connected to a 301C controller (with firmware 3.0 or higher),
it is possible to perform a “remote calibration” using the 301C menu:
1. Using the navigation arrows, access the 301C’s menu
2. Scroll through the menu options and select option 7. Network
3. Scroll through the Network options screens to the last screen and select the Calibration option
Status: In calib...
Set Zero
Set Span 246 PPM
Calib 121 301W
The Calibration screen contains four (4) lines of information:
Line 1: Indicates the mode (Calib, meaning calibration), the (Modbus) address of the device to calibrate
(121) and the type of device to calibrate (301W)
Line 2: Indicates the status (Normal or In calib…) of the specified device
Line 3: Displays the function to perform (Set Zero)
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