View the HMI 41 Indicator and Probes Operation Manual

View the HMI 41 Indicator and Probes Operation Manual
HMI41 INDICATOR AND
HMP41/45/46 PROBES
Operating Manual
U171en-1.3
March 1998
 Vaisala 1998
© Vaisala Oy 1998
No part of this document 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 a prior written
notice of the copyright holder.
The instruction manuals may be changed without prior notice.
Yleisjäljennös 02/1998
HMI41 AND PROBES
Operating Manual
U171en-1.3
Contents
1. THE HMI41 INDICATOR AND PROBES .................................................................................. 1
2. TO BE NOTED IN THE MEASUREMENT OF HUMIDITY ......................................................... 3
3. GETTING STARTED ................................................................................................................ 4
3.1 Inserting the batteries .................................................................................................. 4
3.2 Connecting the probes ................................................................................................. 4
4. TAKING MEASUREMENTS ..................................................................................................... 5
4.2 Starting the measurements .......................................................................................... 5
4.2 Measurement readings on display............................................................................... 6
4.3 HOLD-mode ................................................................................................................... 7
4.3.1 MIN-mode........................................................................................................ 7
4.3.2 MAX-mode ...................................................................................................... 7
5. CALIBRATION................................................................................................................. ........ 8
5.1 Calibration with trimmer potentiometers .................................................................... 8
5.1.1 Humidity calibration ......................................................................................... 8
5.2 Calibration with HMI41 software commands............................................................. 10
5.2.1 One point humidity calibration ....................................................................... 11
5.2.2 Two point humidity calibration ....................................................................... 13
5.2.3 One point temperature calibration.................................................................. 15
5.2.4 Two point temperature calibration.................................................................. 17
6. HMI41 AND DATA COLLECTING.......................................................................................... 20
6.1 Entering the data collecting mode ............................................................................. 20
6.2 Manual data collecting ............................................................................................... 21
6.3 Setting the measurement duration ............................................................................ 22
6.4 Setting the measurement interval .............................................................................. 22
6.5 Reading the measurement results ............................................................................. 23
6.5.1 MIN and MAX in data collecting REC READ mode............................................ 25
7. TRANSFERRING THE STORED READINGS TO A PC ......................................................... 26
7.1 Giving the communication parameters ..................................................................... 26
7.2 Transferring the data .................................................................................................. 29
7.2.1 PLAY Transferring the data ........................................................................... 30
7.2.2 CPLAY Setting characters between decimals and fields ................................ 30
7.2.3 HELP Outputting available commands and their
contents.......................... 31
7.3.4 ? Outputting the HMI41 settings .................................................................... 31
8. CHANGING THE SETTINGS ................................................................................................. 33
8.1 Entering the setup mode ............................................................................................ 33
8.2 Selecting the display units ......................................................................................... 34
8.3 Setting the automatic power-off function.................................................................. 34
8.4 Selecting the display quantities................................................................................. 35
8.5 Setting the pressure for mixing ratio and wet bulb temperature calculations....... 35
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8.6 Selecting the probe type ............................................................................................ 36
9. MAINTENANCE ................................................................................................................. ... 37
9.1 Changing the HUMICAP180 humidity sensor ......................................................... 37
9.2 Chemical tolerances of the HUMICAP 180 sensor................................................... 37
9.3 Using the HMP46 in high temperatures .................................................................... 37
9.4 Spare parts and accessories ..................................................................................... 38
10. IN CASE OF ERROR........................................................................................................... 39
10.1 Trouble shooting ...................................................................................................... 39
10.2 Checking the settings .............................................................................................. 40
11. TECHNICAL DATA ............................................................................................................. 41
11.1 HMI41 indicator ........................................................................................................ 41
11.2 HMP41and HMP45 probes........................................................................................ 42
11.2.1 Relative humidity.......................................................................................... 42
11.2.2 Temperature ................................................................................................ 42
11.2.3 General ........................................................................................................ 42
11.3 HMP46 probe ............................................................................................................ 43
11.3.1 Relative humidity.......................................................................................... 43
11.3.2 Temperature ................................................................................................ 43
11.3.3 General ....................................................................................................... 44
11.4 Accuracy of the calculated quantities..................................................................... 44
11.4.1 Accuracies in metric units ............................................................................ 44
11.4.2 Accuracies in non-metric units ..................................................................... 46
11.5 Electromagnetic compatibility................................................................................. 47
11.5.1 Emissions .................................................................................................... 47
11.5.2 Immunity ...................................................................................................... 47
APPENDIX 1 QUICK REFERENCE GUIDE ............................................................................... 47
WARRANTY....................................................................................................................... ....... 65
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1.
THE HMI41 INDICATOR AND PROBES
The HMI41 is an easy-to-use portable humidity and temperature indicator for
a variety of applications, including such as industrial monitoring and
inspections, occupational health and safety, laboratory and research use, spot
checking etc. When equipped with optional calibration cables, the HMI41 can
also be used as a field calibrator for most Vaisala transmitters.
There are six different probe types that can be used with the HMI41 indicator.
The indicator recognizes the probe type automatically, so there is no need to
change settings each time the probe is changed. However, please, note that
this feature is active only in indicators and probes with letters ID in the
instrument label. For previous versions, the probe type has to be set manually.
The HMP44/L is an exception, as indicators marked with ID recognize
automatically all versions of this probe. All probe types are optimized for
different applications:
• HMP41 probe can be used for measuring humidity and temperature
in various applications, for example in spot checks.
• HMP42 probe head has a diameter of only 4 mm and is 23.5 cm long.
This probe structure is specially indicated for measurements in very
tight places, e.g. in joint spaces between tiles or in air conditioning
channels as well as for measuring the equilibrium humidity of e.g.
timber (separate manual).
• HMP44 and HMP44L are used for measuring humidity in concrete
and other structures (separate manual).
• HMP45 probe is indicated for measurements in channels and other
places that are difficult to reach and therefore require a probe head
with cable.
• HMP46 consists of a 32 cm long probe head of stainless steel; the
HMP46 is optimized for measurements in relatively high
temperatures (up to +100°C, temporarily even +180 °C), in dirty
processes and in general in applications that require a robust probe
structure.
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The HMI41 indicator displays relative humidity, temperature and dewpoint
temperature readings. In addition to these, one of the following quantities can
also be chosen: absolute humidity, wet bulb temperature or mixing ratio.
The indicator also features an automatic power-off function which can be
disabled, and a continuously updated display. The display can also be frozen
to show the current readings, and it can be used for checking the minimum
and maximum readings measured during data collecting. The automatic
power-off function is not active during data collecting even if it was
previously selected.
The versatile HMI41 indicator also includes a data collecting feature. Data
collecting can be either automatic or manual, and it can be optimized for each
application: both the measurement interval and duration can be set by the
user. During automatic data collecting, the probe takes measurements only
just before storing each measurement. In order to minimize the consumption
and to maximize the battery life, the power is automatically turned off for the
measurement interval and the display is dim except when the readings on the
display are updated (once a minute). If required, the collected data can be
transferred to a PC; an optional serial interface cable is available for this
purpose (order code 19446ZZ).
The humidity measurement range is 0...100 %RH. The temperature
measurement range depends on the probe used. Relative humidity is measured
with the accurate and stable HUMICAP 180 humidity sensor which uses an
operating principle based on the changes in the capacitance of the sensor as its
thin polymer film absorbs water molecules.
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TO BE NOTED IN THE MEASUREMENT OF HUMIDITY
In the measurement of humidity and especially in calibration it is essential
that temperature equilibrium is reached. Even a small difference in
temperature between the measured object and the sensor causes an error. If the
temperature is +20 °C (+68 °F) and the relative humidity is 50 %RH, a
difference of +1 °C between the measured object and the sensor causes an
error of +3 %RH. When the humidity is 90 %RH, the corresponding error is +
5.4 %RH.
The error is at its greatest when the sensor is colder or warmer than the
surroundings and the humidity is high. Although the humidity sensor reacts
rapidly to changes in the amount of water vapour in the air, the probe
temperature changes more slowly. To avoid errors caused by temperature
differences the probe must always be left to stabilize to ambient temperature
before starting measurements: the bigger the temperature difference, the
longer the stabilization time.
Indoors relative humidity should be measured in a place where the
temperature is as close to the average temperature of the room as possible.
Measurements taken close to heat sources will not give a true picture of the
relative humidity in the whole room.
10
9
8
7
dRH (%RH)
2.
6
5
4
3
2
1
0
-40
-20
0
20
40
60
80
100
Temperature (°C)
Figure 2.1
Measurement error at 100 %RH when the difference
between the ambient and the sensor temperature is 1 °C
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3.
GETTING STARTED
3.1
Inserting the batteries
When taking the HMI41 indicator into use, first insert the batteries (4 pcs of
size AA [LR6] batteries). Open the lid on back of the device and insert the
batteries as indicated in the housing. Then close the lid carefully.
3.2
Connecting the probes
After having inserted the batteries, connect the probe you wish to use. The
HMP41 is connected to the connector on top of the HMI41: remove the plastic
plug and mount the probe (see Figure 3.2). The HMP45 and the HMP46 both
have a cable to be plugged into the connector at the bottom of the HMI41,
marked PROBE (see Figure 3.2). The other connector is for calibration cables.
HMP41
HMP45 and HMP46
cable
Figure 3.2
4
Connecting the probes to the HMI41
HMI41 AND PROBES
Operating Manual
U171en-1.3
4.
TAKING MEASUREMENTS
4.2
Starting the measurements
Before starting the measurements with the HMI41 and appropriate probe,
remember to allow enough time for stabilization.
Turn the power on with the ON/OFF button and the following appears:
RH
%
Td
°C °F
T
°C °F
g/m hPa
P
setminmax hyst hold Lo batHi
Within a couple of seconds, the display changes to show the software version
and then the probe type indication (41.45 or 42.46):
NOTE: if the following appears, check that the probe is correctly connected:
If the software version does not appear, it is smaller than 1.02 and the
indicator cannot be used with the HMP46 probe. If the probe type does not
appear, the indicator or the probe is of a previous version and the automatic
recognition is not possible; give the setting manually (see Chapter 8).
After a couple of seconds, the battery voltage appears on the display with an
indication of the battery charge (high or low):
bat Hi
If the battery voltage is higher than 4.75 V, the text on the lower righthand
corner is “bat HI” and after a few seconds, the HMI41 automatically displays
the RH and T readings. If the voltage is 4.65...4.75 V, the text is “Lo bat” and
the batteries should be replaced (see Chapter 3.1). If the voltage is lower than
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4.65 V, the indicator turns itself off to prevent erroneous measurements and
readings. Should this happen, replace the batteries.
4.2
Measurement readings on display
Relative humidity and temperature readings appear automatically after the
battery charge indication:
RH
%
T
°C
If MODE is pressed, dewpoint temperature (Td) reading is displayed:
Td
T
°C
°C
When MODE is pressed again, one of the following is displayed or the HMI41
returns to showing the RH and T readings according to what has been chosen
for the measurement quantities (see Chapter 8.4):
T
°C
abs
g/m
T
°C
Temperature and absolute humidity
°C
Temperature and wet bulb temperature; the
arrow in the lower righthand corner indicates that
wet bulb temperature has been chosen
T
°C
Temperature and mixing ratio; the arrow in the
lower righthand corner indicates that mixing ratio
has been chosen (the unit is g/kg or gr/lb).
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4.3
HOLD-mode
In any of the previously mentioned measurement reading displays, the button
HOLD freezes the display to show the current readings, e.g. RH & T readings:
RH
%
T
°C
hold
With MODE or ENTER, the display returns to the normal display mode.
If the indicator turns itself off with the automatic power-off function during
the HOLD-mode, it wakes up in the same mode when turned on again. The
’hold’-text is blinking and the indicator can be returned to the normal display
mode with any button except ON/OFF.
4.3.1
MIN-mode
If you wish to know the minimum readings that have been measured after
power up, press HOLD when the indicator is in the HOLD-mode. The
minimum readings of the currently displayed quantities are shown (if the
‘hold’-text is blinking, the HMI41 must first be returned to the normal display
mode in order to activate the MIN-mode; see Chapter 4.3):
RH
%
T
min
°C
With MODE or ENTER, the indicator returns to the normal display mode.
4.3.2
MAX-mode
If you wish to know the maximum readings that have been measured after
power up, press HOLD when the indicator is in the MIN-mode. The maximum
readings of the currently displayed quantities appear:
RH
%
T
°C
max
The indicator returns to the normal display mode with any button except
ON/OFF.
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Operating Manual
5.
U171en-1.3
CALIBRATION
The HMI41 indicator and probes are fully calibrated at the factory, so there
should be no immediate need for recalibration. Calibration should be
performed only if there is a strong reason to believe that the adjustments have
changed.
5.1
Calibration with trimmer potentiometers
5.1.1
Humidity calibration
Humidity calibration of the probes is preferably done by adjusting the trimmer
potentiometers. The potentiometers are located under a protective plug. The
potentiometer marked T (temperature) is for factory use only; DO NOT make
any adjustments. To make sure that this potentiometer is not accidentally
touched when adjusting the other two, turn the plastic plug aside without
removing it completely (see Figure 5.1.1).
For adjusting the potentiometers, use a trimming wrench provided with the
probe, or some other suitable tool, e.g. a ceramic 1.5 mm slot screwdriver.
HMP41 &
HMP45
HMP46
T
W
D
wet
dry wet
W
W
D
D
dry
Figure 5.1.1
Location of trimmer potentiometers
A two point calibration is performed with the HMK15 or the HMK13B
calibrator or the probe can be sent to Vaisala. The probes must always be
recalibrated when the sensor is changed.
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The calibration procedure is as follows (see also the calibrator manual):
• Leave the calibrator and the probe at the calibration site for at least
30 minutes before starting the calibration in order to let the probe
temperature stabilize to the room temperature. Unscrew the plastic
grid (HMP41 and HMP45) or the sintered filter (HMP46) of the
probe.
• Insert the probe into a measurement hole of the LiCl salt chamber in
the humidity calibrator.
• Wait until the humidity reading stabilizes (approx. 30 minutes).
Check the temperature and read the closest humidity value in the
calibration table. Adjust the dry end reading with the potentiometer D
(dry) in the probe body to correspond to the value given in the
calibration table; use a suitable trimming screw wrench (see Figure
5.1.1).
• Insert the thermometer into the 13.5 mm hole of the NaCl salt
chamber and the probe into another hole of the NaCl chamber.
NOTE
When calibrating probes that are being used for long
term measurements (over 1 hour) in high humidities
(90 - 100 %RH), use the K2SO4 salt as the high end
reference.
• Wait until the humidity reading stabilizes. Read the salt chamber
temperature from the thermometer and then the closest humidity
value from the calibration table. Adjust the wet end reading with the
potentiometer W (wet) to correspond to the value given in the
calibration table.
Table 5.1 Greenspan’s calibration table
°C
0
5
10
15
20
25
30
35
40
45
50
*
LiCl
*
*
*
*
11.3
11.3
11.3
11.3
11.2
11.2
11.1
NaCl
75.5
75.7
75.7
75.6
75.5
75.3
75.1
74.9
74.7
74.5
74.4
K2SO4
98.8
98.5
98.2
97.9
97.6
97.3
97.0
96.7
96.4
96.1
95.8
If the LiCl solution is used or stored in temperatures below +18°C, its equilibrium
humidity changes permanently
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Operating Manual
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As the D (dry) and W (wet) adjustments may affect each other, check again
the humidity reading in the LiCl salt chamber: insert the probe into the
calibration hole and wait until the reading stabilizes. If necessary, repeat the
adjustments in both the LiCl and the NaCl (K2SO4) salt chambers until the
reading is correct.
5.2
Calibration with HMI41 software commands
Calibration can also be done with the HMI41 software commands. When
calibration is done with software commands, the corrections are entered in the
indicator memory with pushbuttons. If only one probe is being used, the
HMI41 software calibration is useful. However, when several probes are in
use, calibration should be done by adjusting the probe potentiometers. Note
that when the sensor is changed, calibration must always be done by adjusting
the potentiometers and it is recommended that the HMI41 is reverted to
factory settings by selecting default calibration.
NOTE
If the factory calibration of the HMI41 is changed, the
correction data refers to the calibrated probe only.
Therefore, if you change the probe, always revert this
data to factory settings by selecting default calibration,
or perform a new calibration with the new probe.
The calibration procedure is included in the HMI41 setup mode. Enter the
setup mode by pressing the ON/OFF button. The following appears:
RH
%
Td
°C °F
T
°C °F
g/m hPa
P
setminmax hyst hold Lo batHi
Then release the ON/OFF button and press within 1 - 2 seconds 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:
°C
set
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Press ENTER eight times until the following text appears:
set
This indicates that no calibration has been selected. In addition to this, there
are five calibration types available. The desired type is selected with buttons
▲ or ▼. All selections are acknowledged with ENTER. In the following, you
will find a list of these calibration options.
RH
T
Default calibration restores the factory settings
of the humidity and temperature calibrations.
set
RH
One point humidity calibration; select this for
performing humidity calibration at one point. See
Chapter 5.2.1 for further details.
set
RH
Two point humidity calibration; select this for
performing humidity calibration at two points.
See Chapter 5.2.2 for further details.
set
T
One point temperature calibration; select this for
performing temperature calibration at one point.
See Chapter 5.2.3 for further details.
set
T
Two point temperature calibration; select this for
performing temperature calibration at two points.
See Chapter 5.2.4 for further details.
set
5.2.1
One point humidity calibration
In one point humidity calibration, one accurate humidity reference is
sufficient. However, note that after one point calibration, the humidity reading
is most accurate near the reference value. For a better accuracy over the whole
range, perform a two point calibration if possible.
Leave the reference instrument (HMK15 or HMK13B) and the probe at the
calibration site at least 30 minutes so that the probe temperature stabilizes to
the room temperature. Start the calibration by inserting the probe to the
reference humidity.
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In setup mode, press ENTER repeatedly until the following is displayed:
set
Then press MODE twice, and the following appears:
RH
set
Press ENTER to activate the one point calibration mode. A message similar to
the following appears with the first line blinking:
RH
%
set
The blinking number indicates the humidity reference value in the HMI41
memory. Check the salt chamber temperature, read the closest humidity value
in the calibration table and adjust the display with buttons ▲ and ▼ to
correspond to the value given in the table. For example, if the temperature in
the calibrator's NaCl salt chamber is 20.5 °C, adjust the value to 75.5 %RH:
RH
%
set
Each time the button is pressed, the value changes with 0.1 %. If you keep the
button pressed, the value changes in a faster mode. Press ENTER and the
HMI41 indicator shows the value that the probe is currently measuring,
displaying a message similar to the following:
RH
%
Wait at least ten minutes for the reading to stabilize and press ENTER to
acknowledge the value. Press ENTER again to conclude the one point
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calibration. If the calibration has been successful, the following message
appears:
The correction data has now been calculated and stored in the HMI41
memory. The HMI41 returns automatically to the selection of display units,
and can be turned off. When the indicator is used as a standard indicator and
the correction data differs from the factory settings, an arrow in the upper
righthand corner is displayed:
RH
%
T
°C
If the message “cal pass” does not appear (instead, some other text may
appear, e.g. “too close”, “err offst” or “err gain”), the correction has not been
stored in the memory. The error may be due to an incorrect reference value or
to measured values that are out of the range.
5.2.2
Two point humidity calibration
In two point humidity calibration, two accurate references (e.g. the HMK15 or
the HMK13B Calibrator) are needed. Leave the reference instrument and the
probe at the calibration site for at least 30 minutes so that the probe
temperature stabilizes to the room temperature.
Start the calibration by inserting the probe to the lower reference humidity. In
setup mode press ENTER repeatedly until the following is displayed:
set
Then press MODE three times, and the following appears:
RH
set
Press ENTER to activate the two point humidity calibration mode. A message
similar to the following appears with the first line blinking:
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HMI41 AND PROBES
Operating Manual
RH
set
U171en-1.3
%
Lo
The blinking number indicates the value of the lower humidity reference
stored in the HMI41 memory. Check the salt chamber temperature, read the
closest humidity value in the calibration table and adjust the display with
buttons ▲ and ▼ to correspond to the value given in the table. For example, if
the temperature of the LiCl salt chamber is 22 °C, adjust the value to
11.3 %RH:
RH
set
%
Lo
Press ENTER, and the HMI41 shows the value that the probe is currently
measuring, displaying a message similar to the following:
RH
%
Lo
Wait at least ten minutes for the reading to stabilize and press ENTER to
acknowledge the value. Press ENTER again to conclude the lower point
calibration. A message similar to the following appears with the first line
blinking:
RH
set
%
Hi
The blinking number indicates the value of the higher humidity reference
stored in the HMI41 memory. Insert the probe to the higher reference
humidity. Check the salt chamber temperature, read the closest humidity value
in the calibration table and adjust the display with buttons ▲ and ▼ to
correspond to the value given in the table. For example, if the temperature in
the calibrator's NaCl salt chamber is 20.5 °C, adjust the value to 75.5 %RH:
RH
set
14
%
HMI41 AND PROBES
Operating Manual
U171en-1.3
Press ENTER and the HMI41 indicator shows the value that the probe is
currently measuring, displaying a message similar to the following:
RH
%
Hi
Wait at least ten minutes for the reading to stabilize and press ENTER to
acknowledge the value. Press ENTER again to conclude the calibration. If the
calibration has been successful, the following message appears:
The correction data has now been calculated and stored in the HMI41
memory. The HMI41 returns automatically to the selection of the display
units, and can be turned off. When the indicator is used as a standard indicator
and the correction data differs from the factory settings, an arrow in the upper
righthand corner is displayed:
RH
%
T
°C
If the message “cal pass” does not appear (instead, some other text may
appear, e.g. “too close”, “err offst” or “err gain”), the correction has not been
stored in the memory. The error may be due to an incorrect reference value or
to measured values that are out of the range.
5.2.3
One point temperature calibration
In one point temperature calibration, one accurate temperature reference is
sufficient.
Start the calibration by inserting the probe to the reference temperature.
In setup mode, press ENTER repeatedly until the following is displayed:
set
Then press MODE four times, and the following appears:
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T
set
Press ENTER to activate the one point temperature calibration mode.
A message similar to the following appears with the first line blinking:
T
°C
set
The blinking number indicates the temperature reference value stored in the
HMI41 memory. Check the actual temperature reference and change the
display with buttons ▲ and ▼ to correspond to the accurate value, for
example:
T
°C
set
Press ENTER and the HMI41 indicator shows the value that the probe is
currently measuring, displaying a message similar to the following:
T
°C
Wait at least ten minutes for the reading to stabilize and press ENTER to
acknowledge the value. Press ENTER again to conclude the calibration. If the
calibration has been succesful, the following message appears:
The correction data has now been calculated and stored in the HMI41
memory. The HMI41 returns automatically to the selection of the display
units, and can be turned off. When the indicator is used as a standard indicator
and the correction data differs from the factory settings, an arrow in the upper
righthand corner is displayed:
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RH
%
T
°C
If the message “cal pass” does not appear (instead, some other text may
appear, e.g. “too close”, “err offst” or “err gain”), the correction has not been
stored in the memory. The error may be due to an incorrect reference value or
to measured values that are out of the range.
5.2.4
Two point temperature calibration
In two point temperature calibration, two accurate temperature references are
needed. Note that you must allow enough time for all instruments to stabilize
to the temperature equilibrium.
Start the calibration by inserting the probe to the lower reference temperature.
In setup mode, press ENTER repeatedly until the following is displayed:
set
Then press MODE five times, and the following appears:
T
set
Press ENTER to activate the two point temperature calibration mode. A
message similar to the following appears with the first line blinking:
T
set
°C
Lo
The blinking number indicates the value of the lower temperature reference
stored in the HMI41 memory. Insert the probe to the lower reference
temperature. Check the reference temperature and change the display with
buttons ▲ and ▼ to correspond to the accurate value, for example:
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HMI41 AND PROBES
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T
set
U171en-1.3
°C
Lo
Press ENTER and the HMI41 shows the value that the probe is currently
measuring, displaying a message similar to the following:
T
°C
Lo
Wait at least ten minutes for the reading to stabilize and press ENTER to
acknowledge the value. Press ENTER again to conclude the lower point
calibration. A message similar to the following appears with the first line
blinking:
T
set
°C
Hi
The blinking number indicates the value of the higher temperature reference
stored in the HMI41 memory. Insert the probe to the higher reference
temperature. Check the reference temperature and change the display with
buttons ▲ and ▼ to correspond to the accurate value, for example:
T
°C
Hi
set
Press ENTER and the HMI41 shows the value that the probe is currently
measuring, displaying a message similar to the following:
T
°C
Hi
Wait at least ten minutes for the reading to stabilize and press ENTER to
acknowledge the value. Press ENTER again to conclude the calibration. If the
calibration has been successful, the following message appears:
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The correction data has now been calculated and stored in the HMI41
memory. The HMI41 returns automatically to the selection of the display
units, and can be turned off. When the indicator is used as a standard indicator
and the correction data differs from the factory settings, an arrow in the upper
righthand corner is displayed:
RH
%
T
°C
If the message “cal pass” does not appear (instead, some other text may
appear, e.g. “too close”, “err offst” or “err gain”), the correction has not been
stored in the memory. The error may be due to an incorrect reference value or
to measured values that are out of the range.
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HMI41 AND PROBES
Operating Manual
6.
U171en-1.3
HMI41 AND DATA COLLECTING
The HMI41 indicator can also be used for collecting the measurement data.
The data is stored in the indicator’s non-volatile memory which means that it
is not lost when the indicator is turned off. Please, note also that the automatic
power-off function is not active during data collecting even if previously
selected (see Chapter 8.3). When the data collecting has ended, the automatic
power-off function becomes active again.
6.1
Entering the data collecting mode
Enter the data collecting mode by turning the indicator on with the ON/OFF
button. The following appears for a couple of seconds:
RH
%
Td
°C °F
T
°C °F
g/m hPa
P
setminmax hyst hold Lo batHi
Release the ON/OFF button and press immediately the button HOLD. The
software version and the probe type indication appear, after which the display
changes automatically to show the battery charge:
bat Hi
Within a couple of seconds the text
the HOLD button.
REC AUTO
appears on the display; release
This is the main display of the data collecting mode. With the button MODE
you can enter the REC CATCH mode (manual data collecting, see Chapter 6.2)
and by pressing MODE again, the REC READ mode (reading the measurement
results, see Chapter 6.5). By pressing ENTER, you can set the measurement
duration and by pressing ENTER again, the measurement interval (Chapters
6.3 and 6.4). By pressing HOLD, you can always return to the previous
display.
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6.2
Manual data collecting
For manual data collecting, press the button MODE and the following
appears:
Press ENTER and a text similar to the following appears:
RH
%
T
set
°C
The probe is now taking measurements and you can store the readings at
appropriate intervals by pressing the button HOLD. Each time you store a
reading, its sequence number in the indicator memory appears for a couple of
seconds:
The indicator returns automatically to show the readings. You can store 199
measurement readings in the indicator memory (numbers 1 - 199). In
automatic data collecting, you can store 200 readings (0 - 199). End data
collecting by turning the indicator off. You can read the readings in the REC
READ mode (see Chapter 6.5).
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HMI41 AND PROBES
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6.3
U171en-1.3
Setting the measurement duration
Turn the indicator on with the ON/OFF button, press immediately the button
HOLD and keep it pressed until the text REC AUTO appears on the display.
Press ENTER and a text similar to the following appears on the display:
bat
(previously set duration)
In this mode, you can set the time between the first and the last measurement
stored, e.g. 30 minutes or 3 days. When entering this mode, previously set
duration time appears on the display. If the previously set duration time is too
long for the current battery charge, the longest calculated duration time
possible appears instead. This is also indicated with the text ’MAX’. The
duration of the measurement can be set from 15 minutes to 7 days. The
batteries last for 7 days during data collecting provided that they are of the
same type as those delivered with the indicator.
Set the duration with buttons σ and τ. The duration time can be selected in
steps according to the following:
•
•
•
•
15 min; 30 min
1 - 6 h: each pressing = 1 h
12 h
1 - 7 d: each pressing = 1 d
If the duration selected is too long for the current battery charge, the text ’BAT’
appears. Select a shorter duration time.
Press ENTER to set the measurement interval.
6.4
Setting the measurement interval
min
(previously set interval)
In this mode, you can set the time between two measurements stored, e.g. 5
minutes or 2 hours. When entering this mode, previously set interval appears
on the display. If the previously set measurement interval is too short for the
current memory capacity of the indicator, the shortest calculated measurement
interval appears instead. This is also indicated with the text ’MIN’.
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Select the interval with buttons σ and τ. The measurement interval can be
selected in steps according to the following:
•
•
•
•
1 - 5 min: each pressing = 1 minute
10 min; 15 min; 30 min
1 - 6 h: each pressing = 1 hour
12 h
The text ’LO’ on the display indicates that there is not enough memory for the
chosen interval; select a longer interval. When you press ENTER, a text
similar to the following appears:
RH
%
T
set
°C
This is the measurement mode with the data collecting feature activated. It
can be distinguished from the normal measurement mode by the text ’SET’ on
the lower lefthand corner of the display. The readings on the display are
updated once a minute, and the display is dim except during this updating in
order to minimize the consumption. If the indicator is turned off, the
measurements stored so far remain in the memory and they can be read by
turning the indicator on in the REC READ mode (see section 6.5).
You can end the data collecting by pressing ON/OFF.
6.5
Reading the measurement results
The measurement results can be read in the REC READ mode. This mode can be
entered from the REC AUTO mode by pressing twice the button MODE. The
following appears:
Press ENTER, and a text similar to the following appears on the display:
RH
%
T
°C
Numbers on the first line indicate the reading of the quantity in question (in
this example, RH). The number on the left on the second line (in this example
number 0.) is the sequence number of the measurement. This number helps to
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Operating Manual
U171en-1.3
estimate the time of the measurement stored during automatic data collecting
provided that the starting time and the measurement interval are known.
Numbers on the right on the second line indicate the temperature reading
measured simultaneously with the reading on the first line; if you wish to see
the decimals, press ENTER. The reading appears on the display with one
decimal:
RH
%
T
°C
In a couple of seconds the indicator returns to the previous display.
Press MODE to change the quantity on the first line:
Td
T
°C
°C
If you press ENTER (with any quantity on the first line), an arrow appears on
the higher right hand corner of the display:
RH
%
T
°C
Press HOLD while the arrow is displayed to scroll the measurement results
(note that the sequence number changes):
RH
%
T
°C
HOLD:
RH
%
T
°C
etc.
If the button HOLD is pressed continuously, numbers change in a faster rate.
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6.5.1
MIN and MAX in data collecting REC READ mode
When the data collecting REC READ mode has been activated, the HOLD
button brings four different modes on the display: MIN HI, MAX HI, MIN LO and
MAX LO. These modes indicate the maximum and minimum readings measured
for the quantities on the display. HI and LO tell you whether the reading
observed is the one on the first line (HI) or the one on the second line (LO).
MIN and MAX indicate whether the reading on the display is the minimum or
the maximum value. In other words, if the text is MIN HI it means that you are
now observing the minimum reading of the quantity on the first line.
By pressing HOLD repeatedly you can change from one display mode to
another, and by pressing MODE you can change the quantity on the first line.
In all these modes, the decimals of the second line reading are shown by
pressing the button ENTER.
Examples:
RH
%
T
°C
RH
%
T
°C
ENTER
Hi
min
returns automatically
(minimum reading of the 1st line quantity)
min
Hi
(decimals of the 2nd line)
HOLD
RH
%
T
°C
RH
%
ENTER
max
Hi
T
returns automatically
°C
Hi
max
(maximum reading of the 1st line quantity) (decimals of the 2nd line)
HOLD
RH
%
T
°C
RH
%
T
°C
ENTER
min
Lo
returns automatically
min
Lo
(minimum reading of the 2nd line quantity) (decimals of the 2nd line)
HOLD
RH
%
RH
%
T
°C
ENTER
T
°C
max
Lo
returns automatically
max
Lo
(maximum reading of the 2nd line reading) (decimals of the 2nd line)
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HMI41 AND PROBES
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7.
U171en-1.3
TRANSFERRING THE STORED READINGS TO A PC
The readings that have been stored in the HMI41 memory manually or
automatically in the data collecting mode, can be transferred to a computer
and then printed if desired. In order to do this, connect a serial connection
cable (order code 19446ZZ) to the appropriate connectors on your PC and in
the HMI41:
connect the
serial cable
to the EXT
connector
Figure 7.1
7.1
Connecting the cable
Giving the communication parameters
Give the communication parameters when using this terminal session for the
first time; save them for future use. See instructions in the following tables.
Table 7.1.1
Giving parameters in Windows 3.1
MENU
DESCRIPTION
PROGRAM MANAGER
Ú
ACCESSORIES
Ú
double click
TERMINAL
Ú
Settings
Ú
double click
Communications
Ú
File
Ú
Save as
click
click and select parameters
(see figure 7.1.1 next page);
click OK
move the cursor to:
click
click and save settings: type
the name of the file (e.g.
HMI41) and click OK
Turn the HMI41 on and follow the instructions in Ch. 7.2
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NOTE: select the
connector
according to
your computer.
Select the
connector first
and give then
other parameters
Figure 7.1.1
Giving the communication parameters in Windows 3.1
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HMI41 AND PROBES
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Table 7.1.2
Giving parameters in Windows 95 and Windows NT
WINDOWS 95
MENU
Start
Ú
Programs
Ú
Accessories
Ú
HyperTerminal
Ú
Hypertrm
Ú
Connection
Description
WHAT TO DO
move the cursor to:
move the cursor to:
move the cursor to:
click
move the cursor to:
double click
type the name of the
connection (e.g.
HMI41) in the
appropriate field
and select an icon if
available; click OK.
WINDOWS NT
MENU
Start
Ú
Programs
Ú
Accessories
Ú
HyperTerminal
Ú
Hyperterminal
Ú
Connection
Description
WHAT TO DO
move the cursor to:
move the cursor to:
move the cursor to:
move the cursor to:
click
type the name of the
connection (e.g.
HMI41) in the
appropriate field and
select an icon if
available; click OK.
Ú
Phone Number
move the cursor to
the field CONNECT
USING and select
’direct to COM x’
(x = serial port
available); click OK
Ú
COM x properties
Connect to
move the cursor to
the field CONNECT
USING and select
’COM x’ (x = serial
port available); click
OK
Ú
select parameters
according to the
screen in figure
7.1.2; click OK
COM x properties
select parameters
according to the
screen in figure
7.1.2; click OK
Turn the HMI41 on and follow the instructions in Chapter 7.2
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Figure 7.1.2
7.2
Selecting the parameters in Windows 95 and NT
Transferring the data
When you have given the communication parameters, you can start
transferring the data from the HMI41. Note that communication parameters
can be stored in the computer for future use.
To start transferring the data, make sure that the HMI41 is connected to a
serial port of your computer and that the terminal session is open. Turn the
HMI41 on with the ON/OFF button. A text similar to the following should
now appear on your computer display:
HMI41 / 2.01
>
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7.2.1
U171en-1.3
PLAY
Transferring the data
To transfer the data on your PC, type
outputting automatically stored data:
PLAY
and press ENTER. An example of
>play
Reading Log... OK
data
0
1
2
3
4
5
6
>
hh:mm:ss
00:00:00
00:01:00
00:02:00
00:03:00
00:04:00
00:05:00
00:06:00
RH
12.54
12.10
12.18
12.12
12.16
12.09
12.09
T
21.53
21.23
21.18
21.15
21.14
21.12
21.09
Td
-8.48
-9.16
-9.12
-9.21
-9.18
-9.27
-9.28
An example of outputting manually stored data:
>play
Reading Log... OK
data
1
2
3
4
5
6
RH
12.10
12.18
12.12
12.16
12.09
12.09
T
Td
21.23
21.18
21.15
21.14
21.12
21.09
-9.16
-9.12
-9.21
-9.18
-9.27
-9.28
>
If you know the starting time of the automatic data collecting, you can enter it
with the command and get an output showing the actual time of measurement.
For example:
>play 15:05
Reading Log... OK
data
0
1
2
3
4
5
6
7
>
hh:mm:ss
15:05:00
15:06:00
15:07:00
15:08:00
15:09:00
15:10:00
15:11:00
15:12:00
7.2.2
CPLAY
RH
8.52
9.58
9.60
9.61
9.65
11.22
9.93
9.92
T
23.69
23.66
23.50
23.30
23.25
23.41
23.30
23.22
Td
-11.70
-10.26
-10.35
-10.48
-10.47
-8.44
-10.08
-10.15
Setting characters between decimals and fields
With the CPLAY command, you can select what you want to appear between
decimals and various fields. An example:
>cplay
Desimal separator : .
Field separator
: TAB
example:
1
01:00:00
30
38.72
21.61
7.01
HMI41 AND PROBES
Operating Manual
U171en-1.3
>
To change the output, type CPLAY, then the character you wish to appear
between decimals, then the character you wish to use between fields and then
<cr>. An example:
>cplay ,
<cr>
Desimal separator : ,
Field separator
: TAB
example:
1
01:00:00
>
7.2.3
HELP
38,72
21,61
7,01
Outputting available commands and their
contents
If you wish to see which commands are available, type HELP and press
ENTER. The following list appears:
>help
Available commands :
HELP
?
PLAY
CPLAY
Type HELP <command_name> for more help
>
To see the contents of each command, type HELP, command name (e.g. PLAY)
and press ENTER; this brings an explanation of the command and its usage on
the display:
>help play
Command : PLAY
Purpose : Send recordings from memory to serial port
Usage
: PLAY hh:mm <cr>, hh:mm = rec starting time (optional)
if command is used without parameters it uses default setting
>
7.3.4
?
Outputting the HMI41 settings
If you need to know which parameters and settings are currently stored in
your HMI41 indicator, type ? and press ENTER:
>?
HMI41 / 2.01
Serial number
Output units
Baud P D S
Pressure
Auto Off
Probe
Start-up mode
4.th variable
>
: A0000000
: metric
:
4800 E 7 1 FDX
: 1013.25
:
5
:
2
:
1
: none
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To exit the terminal session, go to FILE menu and select EXIT. Confirm that
you wish to quit and then select whether you wish to store the parameters of
this session for future use or not (SAVE - YES/NO).
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8.
CHANGING THE SETTINGS
The HMI41 settings can be changed in the SETUP mode. It is necessary to give
the probe type setting manually if the factory settings of the indicator have
been changed or if the indicator or the probe do not have letters ID in the
instrument label.
The factory settings of the HMI41 are the following:
• display units:
0
(metric)
• automatic power-off:
5
minutes
• display quantities:
0
(= RH, T, Td)
• pressure:
1013.25 hPa
(1 hPa = 1 mbar)
(for wet bulb temperature and mixing ratio calculations)
• probe type
AUT
• start
1
(or 1, see below) (all/or HMP41/45)
(HMP41/42/45/46)
Indicators marked with letters ID have the automatic probe recognition as
default (AUT PROBE) and previous versions the probe type 1. If the indicator
does not recognize the probe type automatically, set the type manually to
2 when using the HMP46. Note also that the HMP46 probe cannot be used
with the HMI41 unless the software version is 1.02 or more. To check the
version, turn the HMI41 on with the ON/OFF button. The version appears on
the display in a couple of seconds if it is 1.02 or greater. If it does not appear,
contact Vaisala or a Vaisala representative for further information.
8.1
Entering the setup mode
Enter the setup mode by pressing the ON/OFF button. The following appears:
RH
%
Td
°C °F
T
°C °F
g/m hPa
P
setminmax hyst hold Lo batHi
Then release the ON/OFF button and within 1 - 2 seconds press
simultaneously 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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U171en-1.3
°C
set
You can scroll the setup menu by pressing ENTER.
8.2
Selecting the display units
°C
set
You can now select the display units with buttons ▲ or ▼. Choose 0 for
metric units or 1 for non-metric units (see Table 8.2). The temperature unit on
the display changes accordingly. If you do not wish to change any other
settings, press the ON/OFF button. If you wish to change some other settings,
press ENTER; the display changes to show the setting of the automatic poweroff function.
Table 8.2 Metric and non-metric units
quantity
RH
T
Td
a
x
Tw
8.3
metric
%RH
°C
°C
g/m3
g/kg
°C
non-metric
%RH
°F
°F
gr/ft3
gr/lb
°F
Setting the automatic power-off function
set
The number (or text NO) on the first line of the display indicates in minutes
(1...60) the time that the HMI41 stays on before it automatically turns itself
off if no buttons are pressed. The number is changed with buttons ▲ and ▼. If
NO is chosen, the automatic power-off function is not activated. If you do not
wish to change any other settings, press the ON/OFF button. If you wish to
change some other settings, press ENTER; the display changes to show the
selection of the display quantities.
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8.4
Selecting the display quantities
set
The HMI41 displays relative humidity, temperature and dewpoint temperature
readings. In addition to these, one of the following quantities can be chosen:
absolute humidity, wet bulb temperature and mixing ratio. The number on the
display indicates the following quantities:
0 = RH, T, Td
1 = RH, T, Td, abs
2 = RH, T, Td, Tw
3 = RH, T, Td, x
The number is changed with buttons ▲ and ▼. If you do not wish to change
other settings, press the ON/OFF button. If you wish to change other settings,
press ENTER; the display changes to show the setting of the pressure for
mixing ratio and wet bulb temperature calculations.
8.5
Setting the pressure for mixing ratio and wet bulb temperature
calculations
P
set
hPa
The pressure is changed (in steps of 0.25 hPa) with buttons ▲ (number up)
and ▼ (number down). Acknowledge the pressure setting with ENTER and a
text similar to the following appears:
set
or
set
Indicators marked with letters ID have the automatic probe recognition as
default (AUT PROBE) and previous versions the probe type 1. If the indicator
does not recognize the probe type automatically, set the type manually to 2
when using the HMP46. If the probe type does not have to be changed (with
probes HMP41/45), turn the indicator off.
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HMI41 AND PROBES
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8.6
U171en-1.3
Selecting the probe type
set
If necessary, change the setting with buttons ▲ and ▼. You have now
completed the setup procedure; turn your indicator off.
NOTE
The HMI41 setup contains further settings (start, baud,
seri and calib) that appear after probe type setting when
pressing ENTER. Start setting is changed only when
using the HMP44/44L probes ( START 5, see the HM44
Operating Manual). For calib, see Chapter 5. Other
settings are meant for the HMI41 used as a field
calibrator for other Vaisala humidity transmitters. It is
recommended that these settings are not changed.
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9.
MAINTENANCE
9.1
Changing the HUMICAP180 humidity sensor
Unscrew the plastic grid (HMP41&45) or the sintered filter (HMP46).
Remove the damaged sensor and mount a new HUMICAP®180 humidity
sensor in its place. Handle the sensor with care. Calibrate the probe using a
two-point calibration procedure (see section 5.2.4).
9.2
Chemical tolerances of the HUMICAP180 sensor
Long-term exposure of the HUMICAP sensor to certain chemicals and gases
may affect the characteristics of the sensor and shorten its life. The following
table gives the recommended maximum ambient concentrations of some
chemicals:
Organic solvents
Aggressive chemicals (e.g. strong acids
such as SO2, H2SO4, H2S, HCl, Cl2, etc.)
Weak acids
Bases
ppm (typ.)
1000...10 000
1...10
100...1000
10 000...100 000
If necessary, request detailed information on allowed concentrations from
Vaisala representatives.
9.3
Using the HMP46 in high temperatures
The HMP46 probe can be temporarily used in high temperatures. For example,
the probe can be installed in +180 °C for 30 minutes provided that the probe
handle and 10 cm of the metal tube are at room temperature. When the
HMP46 probe is used in high temperatures, it warms up. Take necessary
precautions before touching it!
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HMI41 AND PROBES
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9.4
Spare parts and accessories
Order code
HMP41
HMP42
HMP45
HMP46
HUMICAP180
18921
0195
2787HM
6221
6597
10159HM
HM46717
HM26849
HM36736
HM27104
HM36939
19446ZZ
19116ZZ
19164ZZ
19165ZZ
HMK15
HMK13B
38
U171en-1.3
Description
RH & T probe; for fixed mounting
RH & T probe; for tight spaces
RH & T probe; cable model
RH & T probe; cable model, for dirty or hot
processes
Humidity sensor
Temperature sensor Pt 1000 (IEC 751 1/3 Class B)
Sintered filter for HMP46
Membrane filter for HMP41 and HMP45
Plastic grid for HMP46
Membrane filter 0.2µm
Membrane filter for HMP46
Plastic grid for HMP41 and HMP45
Carrying case (HMI41, HMP46; HMP44/L and
accessories)
Carrying case (HMI41,HMP41 and HMP45)
Carrying case (HMI41 and HMP42)
Probe holder for HMP46 (used in the calibration of
Vaisala’s duct mounted transmitters)
Serial interface cable for HMI41
Calibration cable (for HMD/W60/70, HMP140 series)
Calibration cable (for HMP230 series)
Calibration cable (for HMD/W20/30, HMP130 series)
Humidity Calibrator
Humidity Calibrator
HMI41 AND PROBES
Operating Manual
U171en-1.3
10.
IN CASE OF ERROR
The HMI41 goes through a continuous self-diagnostic procedure. If any
problems occur, it displays the corresponding error message:
where nn = the number indicating the error
Whenever you come across an error message or your indicator does not
function as it should, first check that the probe is correctly connected. Then
check that the filter and grid are clean.
10.1
Trouble shooting
In the following, a short list for trouble shooting:
PROBLEM:
WHAT TO DO:
the display is blank
- check the batteries (see Chapters 3.1 and 9.1)
- if the batteries are ok, contact Vaisala or a Vaisala
representative
the display is dim
the readings seem to
be wrong
you have accidentally
changed some settings
- during automatic data collecting, the display is dim
except when the readings are updated (once a minute)
- allow enough time for the probe to stabilize to
the ambient temperature
- check that the probe is correctly connected to the
indicator
- check that the grid and filter are clean
- make sure that the measurement point is clean and
that there is no condensated water
- check that the settings are correct (see
Chapter 10.2)
- enter the setup mode, select the setting with
ENTER and change it with buttons ▲ or ▼ (see
table on previous page). The pressure setting has to
be acknowledged with ENTER.
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10.2
U171en-1.3
Checking the settings
Turn the HMI41 on and enter the setup mode (see Chapter 8). Make sure that
the following settings are correct:
setting
probe
start (*)
baud
seri
calib
correct value
AUT (all probes) or
1 (with HMP41/45) or
2 (with HMP46)
1
4.8
E.7.1
def (**)
(*) values 2, 3 and 4 are for calibration cables
(**) when the calib setting is entered, the value is always “no”; factory
settings for calibration correction data can be returned by selecting “def”
If the settings are not correct, change them: in the setup mode, select the
setting with ENTER, change it with buttons ▲ or ▼ and acknowledge with
ENTER. If the error message still appears, write it down and contact Vaisala
or a Vaisala representative for further instructions.
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11.
TECHNICAL DATA
11.1
HMI41 indicator
Maximum measurement
error caused by the indicator
at 20 °C (for system accuracy, see probes’ technical specifications)
humidity
+0.1 %RH
temperature
+0.1 °C
Calculated variables
dewpoint temperature, absolute
humidity, wet bulb temperature,
mixing ratio
Resolution
0.1 %RH; 0.1 °C
Power supply
4 batteries, type AA (IEC LR6)
Battery operation time
72 h continuous use
Operating humidity range
0...100 %RH non-condensing
Operating temperature
-20...+60 °C
Storage temperature
-40...+70 °C
Display
two line LCD
Housing material
ABS plastic
Housing classification
IP 53 (with connectors blocked)
Connector type
modular connector
Weight (incl. batteries)
300 g
Dimensions with probes:
30
38
80
320
30
30
37
38
118
88
440
HMP41
E NTE R
13
Ø 18.5
Ø 21
¢13
ON / OF F
125
200
106
M I N /M A X
106
MODE
HOLD
237
318
Ø 18.5
75
HMI41
HMP46
HMP45
41
HMI41 AND PROBES
Operating Manual
11.2
U171en-1.3
HMP41and HMP45 probes
11.2.1
Relative humidity
Measurement range
0...100 %RH non-condensing
Accuracy (at +20 °C)
when calibrated against
salt solutions (ASTM E104-85): ±2 %RH (0...90 %RH)
±3 %RH (90...100 %RH)
Temperature dependence
of electronics
±0.05 %RH/ °C
Typical long-term stability
better than 1 %RH per year
Response time (90%) at 20 °C
in still air with sintered filter
15 s
Humidity sensor
HUMICAP® 180
11.2.2
Temperature
Measurement range
(for which accuracy is specified):
Temperature sensor
Accuracy:
°C
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-20
-10
0
10
20
30
-20...+60 °C
Pt 1000 (IEC 751 1/3 Class B)
40
50
60
°C
11.2.3
General
Cable length (HMP45)
Connector type (HMP45)
Operating temperature range
Storage temperature range
Housing material
Housing classification (electronics)
Sensor protection
Weight:
HMP41
HMP45
42
1500 mm; extended spiral cable
modular connector
-40...+60 °C
-40...+70 °C
ABS plastic
IP65 (NEMA 4)
plastic grid, part no. HM46717
30 g
160 g
HMI41 AND PROBES
Operating Manual
U171en-1.3
11.3
HMP46 probe
11.3.1
Relative humidity
Measurement range
0...100 %RH non-condensing
Accuracy (at +20 °C); maximum achievable accuracy
when calibrated against high quality,
certified humidity standards
±1 %RH (0...90 %RH)
±2 %RH (90...100 %RH)
when calibrated against
salt solutions (ASTM E104-85): ±2 %RH (0...90 %RH)
±3 %RH (90...100 %RH)
Temperature dependence:
error %RH
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-40 -20 0
for temporary
use only
20 40
60 80 100 120 140 160 180
T/°C
Typical long-term stability
Response time (90%) at 20 °C
in still air with sintered filter
Humidity sensor
11.3.2
better than 1 %RH/ year
15 s
HUMICAP®180
Temperature
Measurement range (sensor head)
Temperature sensor
Accuracy at +20°C
-40...+100 °C (temporarily +180 °C)
Pt100 IEC 751 1/3 Class B
±0.2 °C
Accuracy over the whole temperature range:
°C
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-40 -20 0 20 40 60 80 100 120 140 160 180
T/°C
Temperature dependence
of electronics
0.005 °C/ °C
43
HMI41 AND PROBES
Operating Manual
U171en-1.3
11.3.3
General
-20...+60 °C
-40...+100 °C (temporarily + 180 °C)
-40...+80 °C
Operating temperature range
sensor head
Storage temperature range
Material:
handle
pipe
cable
Housing classification (electronics)
Weight
11.4
ABS plastic
stainless steel
PVC spiral cable
IP65 (NEMA 4)
450 g (incl. package)
Accuracy of the calculated quantities
Dewpoint temperature, mixing ratio, absolute humidity and wet bulb temperature are calculated from the measured relative humidity and temperature
values. The accuracy of the calculated quantities depends on the calibration of
the probe and on performing the measurement correctly. In tables below the
accuracies of the measured values are ±2 %RH and ±0.2°C.
11.4.1
Accuracies in metric units
Accuracy of dewpoint temperature (°C)
T/°C
44
-40
-20
0
20
40
60
80
100
120
140
160
RH/%
10
1.82
2.09
2.51
2.87
3.24
3.60
4.01
4.42
4.86
5.31
5.80
20
1.00
1.14
1.37
1.56
1.76
1.96
2.18
2.41
2.66
2.91
3.18
30
0.74
0.83
1.00
1.13
1.27
1.42
1.58
1.74
1.92
2.10
2.30
40
0.61
0.68
0.81
0.92
1.03
1.14
1.27
1.40
1.54
1.69
1.85
50
0.53
0.59
0.70
0.79
0.88
0.97
1.08
1.19
1.31
1.44
1.57
60
0.48
0.53
0.63
0.70
0.78
0.86
0.95
1.05
1.16
1.27
1.38
70
0.44
0.49
0.57
0.64
0.71
0.78
0.86
0.95
1.04
1.14
1.24
80
0.42
0.45
0.53
0.59
0.65
0.72
0.79
0.87
0.96
1.05
1.14
90
0.50
0.55
0.61
0.67
0.74
0.81
0.89
0.97
1.06
100
0.48
0.53
0.58
0.64
0.70
0.76
0.84
0.91
0.99
HMI41 AND PROBES
Operating Manual
U171en-1.3
Accuracy of mixing ratio (g/kg) with
T/°C
ambient pressure of 1013.25 mbar
RH/%
10
20
30
40
50
60
70
80
0.002 0.002 0.002 0.002 0.003 0.003 0.003 0.003
-40
0.014 0.015 0.017 0.018 0.019 0.020 0.022 0.023
-20
0.08 0.09 0.09 0.10 0.10 0.11 0.12 0.12
0
0.31 0.33 0.35 0.37 0.39 0.41 0.43 0.45
20
0.97 1.03 1.10 1.17 1.24 1.31 1.38 1.46
40
2.70 2.94 3.46 3.76 3.72 4.08 4.42 4.79
60
6.78 7.80 9.00 10. 4 12.2 14.3 16.9 20.2
80
16.4 21.6 29.2 41.3 62.0
101
190
462
100
41.2 75.7
176
120
140
160
90
0.13
0.47
1.54
5.19
24.4
-
100
0.13
0.49
1.62
5.63
29.7
-
90
0.16
0.53
1.49
3.63
7.83
15.3
27.8
46.9
75.0
100
0.17
0.55
1.54
3.74
8.05
15.7
28.4
47.9
76.4
Accuracy of absolute humidity (g/m3 )
T/°C
-40
-20
0
20
40
60
80
100
120
140
160
RH/%
10
20
30
40
50
60
70
80
0.003 0.003 0.003 0.003 0.004 0.004 0.004 0.005
0.020 0.021 0.023 0.025 0.026 0.028 0.029 0.031
0.10 0.11 0.12 0.13 0.13 0.14 0.15 0.15
0.37 0.39 0.41 0.43 0.45 0.47 0.49 0.51
1.08 1.13 1.18 1.24 1.29 1.34 1.39 1.44
2.73 2.84 2.95 3.07 3.18 3.29 3.40 3.52
6.08 6.30 6.51 6.73 6.95 7.17 7.39 7.61
12.2 12.6 13.0 13.4 13.8 14.2 14.6 15.0
22.6 23.3 23.9 24.6 25.2 25.8 26.5 27.1
39.1 40.0 41.0 42.0 43.0 44.0 45.0 45.9
63.5 64.9 66.4 67.8 69.2 70.7 72.1 73.5
Accuracy of wet bulb temperature (°C)
T/°C
-40
-20
0
20
40
60
80
100
120
140
160
RH/%
10
20
30
40
50
60
70
80
90
100
0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
0.21 0.21 0.21 0.21 0.22 0.22 0.22 0.22
0.27 0.28 0.28 0.29 0.29 0.29 0.30 0.30 0.31 0.31
0.45 0.45 0.45 0.44 0.44 0.44 0.43 0.43 0.42 0.42
0.84 0.77 0.72 0.67 0.64 0.61 0.58 0.56 0.54 0.52
1.45 1.20 1.03 0.91 0.83 0.76 0.71 0.67 0.63 0.61
2.24 1.64 1.32 1.13 0.99 0.90 0.82 0.76 0.72 0.68
3.06 2.04 1.58 1.31 1.14 1.01 0.92 0.85 0.80 0.75
3.86 2.41 1.81 1.48 1.28 1.13 1.03 0.95 0.88 0.83
4.57 2.73 2.03 1.65 1.41 1.25 1.13 1.04 0.97 0.91
5.23 3.04 2.24 1.81 1.55 1.36 1.23 1.13 1.05 0.98
45
HMI41 AND PROBES
Operating Manual
11.4.2
U171en-1.3
Accuracies in non-metric units
Accuracy of dewpoint temperature (°F)
T/°F
-40
-4
32
68
104
140
176
212
248
284
320
RH/%
10
3.28
3.76
4.52
5.16
5.83
6.48
7.22
7.95
8.75
9.56
10.4
20
1.80
2.05
2.47
2.81
3.16
3.53
3.93
4.34
4.78
5.24
5.73
30
1.33
1.50
1.80
2.04
2.29
2.55
2.84
3.13
3.45
3.78
4.14
40
1.10
1.22
1.46
1.65
1.85
2.05
2.28
2.52
2.77
3.04
3.33
50
0.96
1.06
1.26
1.42
1.58
1.75
1.95
2.15
2.36
2.59
2.83
60
0.86
0.95
1.13
1.26
1.40
1.55
1.72
1.89
2.08
2.28
2.49
70
0.80
0.88
1.03
1.15
1.27
1.41
1.55
1.71
1.88
2.05
2.24
80
0.75
0.82
0.96
1.06
1.18
1.30
1.43
1.57
1.72
1.88
2.05
90
0.90
1.00
1.10
1.21
1.33
1.46
1.60
1.75
1.90
100
0.86
0.95
1.04
1.14
1.26
1.38
1.50
1.64
1.79
30
40
50
60
70
80
0.015 0.016 0.018 0.019 0.020 0.021
0.116 0.125 0.134 0.142 0.151 0.159
0.65 0.69 0.73 0.77 0.81 0.85
2.44 2.58 2.72 2.87 3.01 3.15
7.77 8.25 8.74 9.25 9.77 10.3
22.3 24.2 26.3 28.5 30.9 33.5
63.0 73.1 85.2
100
118
141
205
289
434
709 1329 3237
1235
-
90
0.89
3.30
10.9
36.4
170
-
100
0.93
3.44
11.4
39.4
208
-
Accuracy of mixing ratio (gr/lb)
T/°F
T/°F
46
with ambient pressure
RH/%
10
20
0.013 0.014
-40
0.099 0.108
-4
0.57 0.61
32
2.17 2.31
68
6.85 7.31
104
18.9 20.6
140
47.5 54.6
176
115
151
212
288
530
248
284
320
of 1013.25 mbar
Accuracy of absolute humidity (gr/ft3 )
RH/%
10
20
30
40
50
60
70
80
90
100
0.001 0.001 0.001 0.002 0.002 0.002 0.002 0.002
-40
0.009 0.009 0.010 0.011 0.011 0.012 0.013 0.014
-4
0.046 0.049 0.052 0.055 0.058 0.060 0.063 0.066 0.069 0.072
32
0.16 0.17 0.18 0.19 0.20 0.21 0.21 0.22 0.23 0.24
68
0.47 0.49 0.52 0.54 0.56 0.58 0.61 0.63 0.65 0.67
104
1.19 1.24 1.29 1.34 1.39 1.43 1.48 1.53 1.58 1.63
140
2.65 2.74 2.84 2.94 3.03 3.13 3.22 3.32 3.41 3.51
176
5.33 5.50 5.67 5.84 6.01 6.18 6.35 6.52 6.69 6.86
212
9.87 10.2 10.4 10.7 11.0 11.3 11.5 11.8 12.1 12.4
248
17.0 17.5 17.9 18.3 18.7 19.2 19.6 20.0 20.5 20.9
284
27.7 28.3 28.9 29.6 30.2 30.8 31.4 32.1 32.7 33.3
320
HMI41 AND PROBES
Operating Manual
U171en-1.3
Accuracy of wet bulb temperature (°F)
T/°F
11.5
-40
-4
32
68
104
140
176
212
248
284
320
RH/%
10
0.36
0.37
0.49
0.82
1.51
2.62
4.03
5.52
6.94
8.23
9.41
20
0.36
0.38
0.50
0.81
1.39
2.16
2.96
3.68
4.33
4.92
5.48
30
0.36
0.38
0.51
0.81
1.29
1.86
2.38
2.84
3.26
3.65
4.03
40
0.36
0.38
0.51
0.80
1.21
1.64
2.03
2.36
2.67
2.97
3.26
50
0.36
0.39
0.52
0.79
1.15
1.49
1.79
2.05
2.30
2.54
2.78
60
0.36
0.39
0.53
0.78
1.09
1.37
1.61
1.83
2.04
2.25
2.45
70
0.36
0.40
0.54
0.78
1.05
1.28
1.48
1.66
1.85
2.03
2.21
80
0.37
0.40
0.55
0.77
1.00
1.20
1.38
1.54
1.70
1.87
2.03
90
0.55
0.76
0.97
1.14
1.29
1.44
1.59
1.74
1.89
100
0.56
0.76
0.94
1.09
1.22
1.36
1.49
1.63
1.77
Electromagnetic compatibility
11.5.1
Emissions
Radiated interference, test setup according to EN55022
11.5.2
Immunity
Test:
Test setup according to:
Performance:
Radiated interference
IEC 1000-4-3
level 3
Electrical fast transients
IEC 801-4
level 4
Electrostatic discharge
IEC 801-2
47
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