Vaisala HMDW60 Manuale utente

USER'S GUIDE

Calibration of Series HMD/W60/70 and

HMP140 Transmitters with

Vaisala HUMICAP® Indicator HMI41

U218EN11

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

19116ZZ-U218en-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. OUTPUT SCALE SELECTIONS...............................................................................................3

2.1 Standard transmitter settings...............................................................................3

2.2 Getting started ..............................................................................................................3

2.3 Scale selection modes..................................................................................................4

2.3.1 Voltage output selection mode (U)...................................................................4

2.3.2 Current output selection mode (I).....................................................................5

2.3.3 Customized voltage output selection mode (cU) ..............................................6

2.3.3.1 Humidity channel ...........................................................................................7

2.3.3.2 Temperature channel.....................................................................................9

2.3.4 Customized current output selection mode (cI) ..............................................10

2.3.4.1 Humidity channel .........................................................................................11

2.3.4.2 Temperature channel...................................................................................12

3. CALIBRATION.......................................................................................................................13

3.1 Getting started ............................................................................................................13

3.2 Humidity calibration....................................................................................................15

3.3 Temperature calibration .............................................................................................16

APPENDIX 1: QUICK REFERENCE TO SCALE SELECTIONS AND CALIBRATION

HMI41 Calibration Option

Operating Manual 19116ZZ-U218en-1.1

ii 1996-08-29

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HMI41 Calibration Option

19116ZZ-U218en-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 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 hysthold Lo batHi

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 19116ZZ-U218en-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/W60/70 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/W60/70 or the HMP140 series transmitters, select

number 2 with buttons ▲(number up) and ▼(number down) and then turn

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

wake up as a calibrator for these analogue transmitters. If you wish to calibrate

transmitters of some other type or use the HMI41 as an indicator, this

selection has to be done accordingly; refer to corresponding manuals for

further details.

Note that if the default settings in the HMI41 memory have not been changed

(e.g. when it is used as a calibrator for the first time), the HMP140 series

transmitters with standard settings and voltage outputs can be directly

calibrated (see Chapter 3). In all other cases scale selections are necessary;

please, consult Chapter 2. The default settings in the HMI41 memory (Table

1.2) are returned with U, I, cU or cI selections according to which changes

have been made.

Humidity range Temperature range Voltage range

0...100 %RH -40...+60 °C0...1V

0...5V

0...10V

Table 1.2 Default settings in the HMI41 memory

HMI41 Calibration Option

19116ZZ-U218en-1.1 Operating Manual

1996-08-29 3

2. OUTPUT SCALE SELECTIONS

2.1 Standard transmitter settings

In Table 2.1 you will find the standard settings of the HMD/W60, HMD/W70

and the HMP140 series transmitters.

Transmitter Relative humidity

scaling range Temperature

scaling range Voltage

output Current output

0...1 V

HMP140 0...100 %RH -40...+60 °C0...5 V 0...20 mA

0...10 V

HMD60 0...100 %RH -20...+80 °C4...20 mA

0...1 V

HMD70 0...100 %RH -20...+80 °C0...5 V 0...20 mA

0...10 V

HMW60 0...100 %RH -5...+55 °C4...20 mA

0...1 V

HMW70 0...100 %RH -5...+55 °C0...5 V

0...10 V

Table 2.1 Standard settings of analogue transmitters

NOTE

When calibrating transmitters with current outputs,

make sure that the output loop is terminated.

2.2 Getting started

After having selected the calibrator function 2 as explained in Chapter 1.2,

turn the HMI41 on with the ON/OFF button and wait until the following text

appears on the display:

This message remains on the display for about 5 seconds; if no button is

pressed, the HMI41 goes on to calibration. To enter the scale selections, press

any button (except ON/OFF) within 5 seconds and the following appears:

HMI41 Calibration Option

Operating Manual 19116ZZ-U218en-1.1

41996-08-29

Scale selection mode is entered when this text is on the display.

2.3 Scale selection modes

The HMI41 has four scale selection modes: voltage output (U) and current

output (I) selection modes are used for transmitters with standard settings.

Customized voltage output (cU) and customized current output (cI) selection

modes are meant for analogue transmitters with customized RH, T and/or

output range settings. All these selections are stored in the HMI41 memory;

therefore, if the transmitter settings or the selections in the HMI41 memory

have not been changed by the next calibration, you can calibrate the

transmitter directly. In the following, each selection mode is explained in its

own section.

2.3.1 Voltage output selection mode (U)

If the transmitter has voltage outputs, its temperature range is given to the

HMI41 with the voltage output selection mode (U). The humidity range is

always 0...100 %RH. Select the U selection mode with buttons ▲or ▼and

acknowledge the selection with ENTER. A text similar to the following is

displayed:

set

T°C

°C

Numbers on the second line are blinking. They indicate the lower limit of the

transmitter’s temperature range currently stored in the HMI41 memory. Text

in the lower righthand corner is Lo. You can now set the lower limit with

buttons ▲(number up) or ▼(number down) to correspond to that of the

transmitter. Acknowledge the setting with ENTER:

HMI41 Calibration Option

19116ZZ-U218en-1.1 Operating Manual

1996-08-29 5

set

T°C

°C

Numbers on the first line start to blink. They indicate the upper limit of the

transmitter’s temperature range currently stored in the HMI41 memory. Text

in the lower righthand corner is Hi. You can now set the upper limit with

buttons ▲(number up) or ▼(number down) to correspond to that of the

transmitter. Acknowledge the setting with ENTER and turn the HMI41 off

with the ON/OFF button.You can now calibrate the transmitter (see Chapter

3).

2.3.2 Current output selection mode (I)

NOTE

When calibrating the transmitters with current outputs,

make sure that the output loop is terminated.

If the transmitter has current outputs, its temperature range is given to the

HMI41 with the current output selection mode (I). The RH range is always

0...100 %RH. Select the I selection mode with buttons ▲or ▼and

acknowledge the selection with ENTER. A text similar to the following is

displayed:

set

Numbers on the display are blinking, and you can now select the output (0...20

or 4...20 mA) with buttons ▲or ▼according to the transmitter to be

calibrated. Acknowledge the selection with ENTER and a text similar to the

following is displayed:

HMI41 Calibration Option

Operating Manual 19116ZZ-U218en-1.1

61996-08-29

set

T°C

°C

Numbers on the second line are blinking. They indicate the lower limit of the

transmitter’s temperature range currently stored in the HMI41 memory. Text

in the lower righthand corner is Lo. You can now set the lower limit with

buttons ▲(number up) or ▼(number down) to correspond to that of the

transmitter. Acknowledge the setting with ENTER:

set

T°C

°C

Numbers on the first line start to blink. They indicate the upper limit of the

transmitter’s temperature range currently stored in the HMI41 memory. Text

in the lower righthand corner is Hi. You can now set the upper limit with

buttons ▲(number up) or ▼(number down) to correspond to that of the

transmitter. Acknowledge the setting with ENTER and turn the HMI41 off

with the ON/OFF button. You can now calibrate the transmitter (see Chapter

3).

2.3.3 Customized voltage output selection mode (cU)

The customized voltage output selection mode (cU) is selected when the

scaling of the RH, T and/or voltage range is not a standard one.

Select the cU selection mode with buttons ▲or ▼and acknowledge the

selection with ENTER. A text similar to the following is displayed:

set

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