MSA GasGard XL Manuel D'utilisation page 33

5.4 Calibration
Calibration (4 - 20 mA)
Channel boards are configured to accept 4 - 20 mA input signals from two-wire or three-wire remote
transmitters. The controller does not require any calibration.
During calibration of MSA's Ultima X Gas Monitors, the GasGard XL unit shows the following:
• For combustibles and toxics, if cal enable is ON, the 3.75 mA signal does not show a fault or under-
range state on the GasGard XL unit. The display may show 0 or some negative value, depending
on the Dead Band Around Zero setting.
• For oxygen, if cal enable is ON, the 21 mA signal causes the GasGard XL to go into an overrange
status. As soon as the signal drops below 20.4 mA, the user must clear this state by pressing the
RESET button.
GasGard XL
Configuration
US
33