Vaisala HMDW60 User manual

USER'S GUIDE
Calibration of Series HMD/W60/70 and
HMP140 Transmitters with
Vaisala HUMICAP® Indicator HMI41
U218EN11

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Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FIN-00421 Helsinki
Finland
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© Vaisala 2006
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agreements are included exclusively in the applicable supply contract or Conditions of
Sale.

HMI41 Calibration Option
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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

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HMI41 Calibration Option
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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:
RH
setminmax hysthold Lo batHi
PPahg/m
T
Td
°C °F
°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
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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

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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:
RH
T
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
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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
Lo
T
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:

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1996-08-29 5
set
Hi
T
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
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61996-08-29
set
Lo
T
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
Hi
T
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:
RH
set