Vaisala HMD20 Manual de usuario

USER'S GUIDE

Calibration of Series HMD/W20/30 and

HMP130 Transmitters with

Vaisala HUMICAP® Indicator HMI41

U220EN11

PUBLISHED BY

Vaisala Oyj Phone (int.): +358 9 8949 1

P.O. Box 26 Fax: +358 9 8949 2227

FIN-00421 Helsinki

Finland

Visit our Internet pages at http://www.vaisala.com/

No part of this manual may be reproduced in any form or by any means, electronic or

mechanical (including photocopying), nor may its contents be communicated to a third

party without prior written permission of the copyright holder.

The contents are subject to change without prior notice.

Please observe that this manual does not create any legally binding obligations for

Vaisala towards the customer or end user. All legally binding commitments and

agreements are included exclusively in the applicable supply contract or Conditions of

Sale.

HMI41 Calibration Option

19165ZZ-U220en-1.1 Operating Manual

1996-08-29 i

Contents

1. INTRODUCTION......................................................................................................................1

1.1 HMI41 with calibration option ......................................................................................1

1.2 Selecting the HMI41 calibrator function ......................................................................1

2. CALIBRATION.........................................................................................................................3

2.1 Getting started ..............................................................................................................3

2.2 Calibration.....................................................................................................................4

APPENDIX 1: QUICK REFERENCE GUIDE

HMI41 Calibration Option

Operating Manual 19165ZZ-U220en-1.1

ii 1996-08-29

This page intentionally left blank.

HMI41 Calibration Option

19165ZZ-U220en-1.1 Operating Manual

1996-08-29 1

1. 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 Vaisala’s HMD/W 60/70 and

HMP140 series analogue transmitters

•19164ZZ for the calibration of HMP230 series digital transmitters

•19165ZZ for the calibration of the HMD/W 20/30 and

HMP130 series analogue transmitters

In this manual, only the calibration of HMD/W 20/30 and HMP130 series

analogue transmitters is dealt with. For other calibration options, please refer

to corresponding manuals.

Calibration is quick and easy to perform. In calibration, the HMI41 measures

relative humidity with the reference probe and receives the RH information

from the transmitter. These two 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 hysthold LobatHi

PPahg/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:

HMI41 Calibration Option

Operating Manual 19165ZZ-U220en-1.1

21996-08-29

set

°C

If the basic settings of the HMI41 (display units, automatic power off

function, display quantities and pressure) have to be changed, please refer to

the HMI41 Operating Manual. Otherwise, press ENTER repeatedly until the

following text appears:

set

The number on the first line of the display corresponds to the following

HMI41 functions:

1 = HMI41 as a humidity and temperature indicator

2 = HMI41 as a calibrator for HMD/W 60/70 and HMP140 series analogue

transmitters

3 = HMI41 as a calibrator for HMP230 series digital transmitters

4 = HMI41 as a calibrator for the HMD/W20/30 and HMP130 series

analogue transmitters

To calibrate the HMD/W 20/30 or HMP130 series transmitters, select number

4 with buttons ▲(number up) and ▼(number down) and then turn the HMI41

off. When the HMI41 is turned on again, it will automatically assume the

calibrator function for the HMD/W 20/30 and HMP130 series transmitters. If

you wish to calibrate transmitters of some other type or use the HMI41 as an

indicator, this selection has to be made accordingly; refer to corresponding

manuals for further details.

HMI41 Calibration Option

19165ZZ-U220en-1.1 Operating Manual

1996-08-29 3

2. CALIBRATION

For a successful calibration, it is essential that the probe of the HMI41 and

that of the transmitter are at the same temperature, and that the reference

probe has been previously calibrated. Always allow enough time for the

readings to stabilize. Note that the stabilization time depends on the ambient

conditions and may vary from 10 minutes to a couple of hours.

2.1 Getting started

After having selected the desired function (Chapter 1.2), turn the HMI41 off

and connect the calibration cable to the EXT connector at the bottom of the

HMI41 (Figure 2.1). Connect the other end of the cable to the appropriate

connector in the transmitter (Figures 2.2 - 2.4).

ENTE

MOD

E H

D O

OFF

EXT

Connector for the

calibration cable

Figure 2.1 Location of the HMI41 calibration connector

one point

RH calibration

test connector

Figure 2.2 Calibration connector and potentiometer in

the HMP130 series transmitters

HMI41 Calibration Option

Operating Manual 19165ZZ-U220en-1.1

41996-08-29

offset

gain

test

connector

Figure 2.3 Calibration connector and potentiometers in

the HMD 20/30UB/YB transmitters

gain

offset

test

connector

Figure 2.4 Calibration connector and potentiometers in

the HMW 20/30UB/YB transmitters

2.2 Calibration

After having connected the cable, turn the HMI41 on with the ON/OFF button

and wait until a text similar to the following appears on the display:

RH %

Numbers on the first line indicate the RH measured by the transmitter, and

numbers on the second line indicate the RH measured by the HMI41 reference

probe. If you wish, you can now adjust the transmitter:

•Wait until the readings have stabilized and adjust the calibration

potentiometers (Figures 2.2 - 2.4) until the readings on the first and

the second line are the same. It is recommended to use the offset

potentiometer if the RH is <65 %RH and the gain potentiometer if the

RH is >65 %RH.

HMI41 Calibration Option

19165ZZ-U220en-1.1 Operating Manual

1996-08-29 5

•After having completed the calibration, press ON/OFF and disconnect

the cable.

If you prefer, you can change the HMI41 display to show the difference in the

readings and then adjust the transmitter. To do this, press MODE when both

readings are on the display and a text similar to the following is displayed:

RH %

Numbers on the first line indicate how much the RH measured by transmitter

differs from that of the reference probe. Numbers on the second line indicate

the RH measured by the reference probe. If you wish, you can now calibrate

the transmitter (by pressing MODE again the measured values appear on the

display):

•Wait until the readings have stabilized and adjust the calibration

potentiometers (Figures 2.2 - 2.4) until the numbers on the first line

are as close to zero as possible. It is recommended to use the offset

potentiometer if the RH is <65 %RH and the gain potentiometer if the

RH is >65 %RH.

•After having completed the calibration, press ON/OFF and disconnect

the cable.

GUARANTEE

Vaisala issues a guarantee for the material and workmanship of this product

under normal operating conditions for one (1) year from the date of delivery.

Exceptional operating conditions, damage due to careless handling and mis-

application will void the guarantee.

HMI41 Calibration Option

19165ZZ-U220en-1.1 Appendix 1

1996-08-26 1

APPENDIX 1: QUICK REFERENCE TO CALIBRATION

It is recommended that this quick reference guide is used only as a checking

list for those who already know how to operate the HMI41 as a calibrator. For

those who take it into use for the first time, the Operating Manual gives useful

information that is not included in this quick reference guide.

1. Selecting the calibrator function

For selecting the calibrator function, press ON/OFF until you can see some

text on the display. Then release the ON/OFF button and press within 1...2

seconds both ENTER and MODE buttons until the text "setup" appears on the

display. Then follow the instructions of the table below.

DISPLAY WHAT TO DO PRESS:

Wait for a few seconds.

set

°C

If the basic settings have been given,

press ENTER.

If they have not been given, refer to the

HMI41 Operating Manual.

press ENTER repeatedly:

set

select the HMI41 function:

1 = indicator

2 = calibrator for HMD/W 60/70 and

HMP140 series analogue transmitters

3 = calibrator for HMP230 transmitters

4 = calibrator for HMD/W20/30 and

HMP130 series transmitters

▲(number up) or

▼(number down)

ON/OFF

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