Zero And Span Calibration For Xnx; Zero Calibration - Honeywell VA201T Calibration Handbook

Calibration Handbook

Zero and Span Calibration for XNX

CAUTION
Before initial calibration, allow the sensor to stabilize for 30 minutes after applying power. When in Zero and
Span Calibration modes, the current output from the sensor is inhibited (default 2mA) to avoid false alarms.
&OR MOST STICKY GASES EG (#L #L USE 04&% TUBING WITH SHORT PIECES OF RUBBER TUBE FOR THE lNAL CONNECTION DUE TO THE
INmEXIBILITY OF 04&%  4HIS MINIMIZES ADHESION OF THE GAS TO THE TUBE SURFACE AND ALLOWS MORE ACCURATE MEASUREMENT
To calibrate the sensor, use an appropriate span gas cylinder, tubing, magnet, and calibration gas flow housing.
Set the flow regulator to 300-375 ml/min for XNX EC sensors or 500 ±200 ml/ min for XNX mV sensors. A
compressed gas cylinder (20.9%Vol oxygen) should be used to perform the zero calibration if the area where
the sensor is located contains any residual amount of the target gas. If no residual gas is present, background
air can be used to perform the zero calibration. Contact a Honeywell Analytics representative for details about
suitable calibration kits.
NOTE
4HE OXYGEN SENSOR DOES NOT REQUIRE A ZEROING PROCEDURE "ACKGROUND AIR  6OL OXYGEN CAN BE USED
TO SPAN THE OXYGEN SENSOR IN PLACE OF A COMPRESSED AIR CYLINDER  6OL OXYGEN 
%. PERFORMANCE STANDARDS REQUIRE  MINUTES STABILIZATION TIME FOR APPLICATION OF ZERO AND SPAN GAS FOR
PERFORMANCE APPROVED %# M6 AND )2 SENSORS PRIOR TO CALIBRATION

Zero Calibration

This section outlines the steps for calibrating the transmitter's attached sensors.
NOTE
The Zero Calibration procedure should be performed prior to the Span Calibration procedure.
1. If using a compressed gas cylinder, push the calibration gas flow housing onto the bottom of the sensor
and apply the gas.
2. Access the Gas Calibration Menu.
NOTE
The Gas Calibration menu is for both Zero Calibration and Span Calibration.
Zero Calibration
As the sensor detects the gas and the concentration increases, the values displayed will reflect the changing
concentration. When the concentration values are stable, 3 minutes, select
calculate the zero adjustment. Selecting
Sensor Reading
at Current Settings
✖
will return to the Gas Calibration menu.
148
✓
to allow the transmitter to
XNX Universal Transmitter