Dräger REGARD-1 - TWA Function Switch; Calibrating a 4-20 mA Unit; Transmitter Manual for Calibration; Zero Calibration Procedure (4-20 mA)

Configuration and calibration
Issue 5 - June 2005 Page 33 of 64 Pages
The SW1-F switch sets the TWA function for all firmware versions:
SW1-F TWA
ON ON
OFF OFF
Insert a card in the window above the display to show the measured gas and range.
Pre-printed and blank labels are at the end of this manual.
Calibrating a 4-20 unit
NOTE
For further information, please refer to the calibration instructions
in the transmitter’s operating manual.
Zero calibration
There is no zero adjustment for the 4-20 unit. The controller indicates zero for a
transmitter signal of 4 mA ± 0.3 mA. If necessary, calibrate the transmitter to give
4.0 mA at zero gas.
Span calibration
Span calibration can be performed either by applying calibration gas to the transmitter /
sensor or by changing the output signal of the transmitter, to simulate a gas signal.
Observe the transmitter manual.