Vaisala HUMICAP HMP41 User's Guide download pdf (Page 17)

Chapter 2 __________________________________________________________ Product Overview

VAISALA _______________________________________________________________________ 15

Constant Output Probe

The constant output probe is a testing accessory that can be used to check

transmitter's functions and measurement signal transfer chain all the way

to the control system. The constant output probe does not measure

humidity and temperature; instead, it outputs constant humidity and

temperature readings.

The values output by the constant output probe are specified when

ordering. These values are written on an additional label on the probe

body.

The procedure for using the constant output probe is simply to replace

the original probe for the duration of the testing:

1. Disconnect the normal probe from transmitter.

2. Connect the constant output probe to the transmitter.

3. Check that all used outputs (analog, display, serial line) show the

correct measurement values.

4. After checking the outputs, disconnect the constant output probe

and reconnect the original probe.

NOTE

The transmitter goes to the error state for a short time when the probe is

changed. This is normal.

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Vaisala HUMICAP HMP41 User's Guide Page 17