Configuring Alarms - Dräger REGARD-1 Installation, Operation And Maintenance Manual

WARNING!
Do not change the position of switch SW1-A.
For new Dräger Ex sensors, range 3 (110 – 160 mV) should work for most gases. If,
during calibration, the gas reading does not reach the required value use a lower-
numbered sensitivity range. If the display reading is too high use a higher-numbered
sensitivity range.
2. Apply calibration gas
Use a calibration gas with concentration between 40% and 60% of the measuring
range.
Apply gas using calibration adaptor at 0.5 l/min flow rate.
•
Allow display reading to settle (about 2 to 3 minutes)
•
Adjust VR3 on the pellistor board until the voltage across TP1 and TP2 corresponds
•
to the concentration of the calibration gas.
Gas concentration
(as % of measuring range)
If the device has a display, verify that the display reading corresponds to the gas
•
concentration.

Configuring alarms

There are three gas alarms. Each alarm can be set to be
rising or falling
•
latching or non-latching
•
Issue 5 - June 2005
40
45
50
55
60
Configuration and calibration
Voltage across
TP1 & TP2 (V)
2.08
2.24
2.40
2.56
2.72
Page 39 of 64 Pages