Hmi41 as a reference meter – Vaisala HMT120 User Manual

Page 64

User's Guide _______________________________________________________________________

62 ___________________________________________________________________ M211244EN-B

HMI41 as a Reference Meter
The HMI41 humidity probe is used to show the correct humidity value

(be sure that the reference probe has previously been adjusted). Connect

the cable and select the appropriate adjustment method as previously

explained, and continue according to the following instructions.

A display similar to the one below should be visible:

Numbers on the first line indicate the transmitter reading, and the

numbers on the second line indicate the reference probe reading.

Let the readings stabilize (may take 30 minutes or more). If you

prefer, you can change the display to show the difference in the

readings. Press

HOLD

and a display similar to the following appears:

The numbers on the first line indicate how much the transmitter

reading differs from that of the HMI41 reference probe. The

numbers on the second line indicate the reference probe reading.

You can return to the previous display by pressing

HOLD

again.

10. When the readings have stabilized, press

ENTER

to conclude the

adjustment. When

ENTER

is pressed, the transmitter reading is

corrected to the reference probe reading. If the adjustment has been

succesful, the following display appears:

11. The data is now stored in the transmitter memory. If the adjustment

has not been succesful, the following display appears:

In this case, perform the adjustment again. Whether the adjustment

was succesful or not, the HMI41 always returns to display the

selected adjustment mode.

12. After succesfully completing the adjustment, turn off the HMI41

and disconnect the cable.