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The XDP provides long-term, hands-off operation with

this optional feature. When initiated, the XDP

controls solenoid valves in the sample system to bring

zero and span gases to the transmitter. Then the XDP

software compares calibration gas readings with factory

data to verify proper calibration. If an adjustment is

necessary, the XDP makes corrections automatically and

notifies the user via the front panel display and alarm

contacts.