Introduction, 1 hmi41 with calibration option, 2 selecting the hmi41 calibrator function – Vaisala Calibration of Series HMDW6070 and HMP140 Transmitter with HMI41 User Manual

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HMI41 Calibration Option

19116ZZ-U218en-1.1

Operating Manual

1996-08-29

INTRODUCTION

1.1

HMI41 with calibration option

The HMI41 can be used as a field calibrator for various Vaisala humidity
transmitters. There are three different calibration cables available:

•

19116ZZ

for the calibration of HMD/W60/70 and HMP140
series analogue transmitters

•

19164ZZ

for the calibration of HMP230 series digital
transmitters

•

19165ZZ

for the calibration of the HMD/W20/30 and
HMP130 series analogue transmitters

In this manual, only the calibration of the HMD/W60/70 and HMP140 series
analogue transmitters is dealt with. For other calibration options, please refer
to corresponding manuals.

Calibration is quick and easy to perform. Yet, the HMI41 includes four output
scale selection modes which cover all scalable features of analogue
transmitters and provide for a simple and reliable on-site calibration of even
customized transmitters. In calibration, the HMI41 measures relative humidity
and temperature with a separate probe, and receives the RH and T information
from the transmitter. These values are then compared on the HMI41 display
and the transmitter is adjusted with calibration potentiometers inside the
transmitter.

1.2

Selecting the HMI41 calibrator function

The desired calibrator function is selected in the HMI41 setup menu. To enter
the setup mode, first press the ON/OFF button and the following appears:

setminmax

hyst hold Lo batHi

g/m

°C °F

Then release the ON/OFF button and within 1...2 seconds press both ENTER
and MODE buttons until the following text appears on the display:

After a few seconds, the text changes automatically to show the following:

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