No part of this manual may be reproduced, published or publicly displayed in any form
or by any means, electronic or mechanical (including photocopying), nor may its
contents be modified, translated, adapted, sold or disclosed to a third party without prior
written permission of the copyright holder. Translated manuals and translated portions
of multilingual documents are based on the original English versions. In ambiguous
cases, the English versions are applicable, not the translations.
The contents of this manual are subject to change without prior notice.
This manual does not create any legally binding obligations for Vaisala towards
customers or end users. All legally binding obligations and agreements are included
exclusively in the applicable supply contract or the General Conditions of Sale and
General Conditions of Service of Vaisala.
March 2013. Previous version. Updated list of spare
parts and accessories.
Manual Code
Manual Name
M211507EN
HMD82 HMD83 Wiring Diagram
M211508EN
HMW88 HMW89 Wiring Diagram
M211328EN
HMW82 HMW83 Quick Guide
M211509EN
HMS82 HMS83 Quick Guide
Version Information
Table 1 Manual Revisions
- Added outdoor transmitter models HMS82 and
HMS83.
- Changed PTFE membrane filter model from
230727SP (30 mm long) to ASM210856SP
(24.5 mm long).
- Changed PTFE filter model from 219452SP
(40 mm long) to DRW239993SP (22 mm long).
- Improved IP classification of models with
Related Manuals
WARNING
CAUTION
Table 2 Related Manuals
Documentation Conventions
Throughout the manual, important safety considerations are highlighted
as follows:
Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury or even
death.
Caution warns you of a potential hazard. If you do not read and follow
instructions carefully at this point, the product could be damaged or
important data could be lost.
NOTE
Note highlights important information on using the product.
Chapter 1 _________________________________________________________ General Information
Installation of HMDW80 series transmitters may involve working at a
height. Assess the risks and plan your work so it is carried out safely.
Try avoiding work at height, if you can.
Make sure the wires are de
screw terminals.
Do not modify the unit. Improper modification can damage the product
or lead to malfunction.
Recycle all a
Dispose of the unit according to statutory regulations. Do not dispose of
with regular household refuse.
Safety
The HMDW80 series transmitterdelivered to you has been tested for
safety and approved as shipped from the factory. Note the following
precautions:
WARNING
CAUTION
CAUTION
-energized when you connect them to the
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent damage to
electronic circuits. Vaisala products are adequately protected against
ESD for their intended use. It is possible to damage the product,
however, by delivering electrostatic discharges when touching,
removing, or inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages yourself, always
hold component boards by the edges and avoid touching the component
contacts.
HMDW80 series complies with the following performance and
environmental test standards:
- EMC-Directive
Conformity is shown by compliance with the following standards:
- EN 61326-1: Electrical equipment for measurement, control, and
laboratory use – EMC requirements – For use in industrial locations.
- EN 550022: Information technology equipment – Radio disturbance
characteristics – Limits and methods of measurement.
Trademarks
INTERCAP® is a registered trademark of Vaisala Oyj.
Software License
This product contains software developed by Vaisala. Use of the software
is governed by license terms and conditions included in the applicable
supply contract or, in the absence of separate license terms and
conditions, by the General License Conditions of Vaisala Group.
Warranty
Visit our Internet pages for standard warranty terms and conditions:
www.vaisala.com/warranty.
Please observe that any such warranty may not be valid in case of
damage due to normal wear and tear, exceptional operating conditions,
negligent handling or installation, or unauthorized modifications. Please
see the applicable supply contract or Conditions of Sale for details of the
warranty for each product.
This chapter introduces the features and options of the HMDW80 series
transmitters.
Introduction to HMDW80 Series
Vaisala INTERCAP® Humidity and Temperature Transmitter Series
HMDW80 measure relative humidity and temperature in various building
automation applications. Transmitters combine easy installation and
reliable operation with a low requirement for maintenance.
HMDW80 series includes transmitters for wall and duct mounting,
humid areas, and for outdoor installation. It also includes temperatureonly transmitters and transmitters with an optional display. Calculated
humidity parameters – dewpoint, wet bulb temperature, and enthalpy –
are also available.
HMDW80 series transmitters require minimal maintenance thanks to
their excellent sensor stability and high-quality materials. If necessary,
the INTERCAP® humidity sensor can be easily exchanged in the field
with practically no downtime.
Features provided by transmitters in the HMDW80 series:
- ±3.0 %RH accuracy.
- 0 ... 100 %RH measurement range.
- User exchangeable INTERCAP® humidity sensor for easy field
replacement.
- Several output parameters; see section HMDW80 Series Transmitter
Models on page 10 for list of supported parameters by transmitter
model.
- Several IP65-classified models for demanding HVAC applications.
RH % Ratio of the partial pressure of water vapor in
at the current temperature.
Dewpoint
Td
°C
Temperature at which the water vapor in the air
dewpoint.
Enthalpy
h
kJ/kg
BTU/lb
Sum of the internal energy of a thermodynamic
system.
Wet bulb
temperature
Tw
°C
°F
The minimum temperature that can be reached
by evaporative cooling in the current conditions.
HMDW80 Series Transmitter Models
Table 3 below lists the most important differences between the HMDW80
series transmitter models. For technical specifications, see Chapter 6, Technical
Data, on page 45.
Table 3 HMDW80 Series Transmitter Models
Output Parameters Explained
Table 4 Parameters Supported by HMDW80 Series
humidity
°F
the air to the saturation vapor pressure of air
will condense into water at the current pressure.
When the dewpoint is below 0 °C, the
transmitter outputs frostpoint (Tf) instead of
When the transmitter is powered on, it displays a sequence of
information screens about the transmitter and its analog outputs.
The screens are shown for a few seconds each. Checking the screens on
startup is a good way to verify that the transmitter’s configuration DIP
switches are set correctly.
1302-021
Figure 5 Startup Screens (HMD83D)
After the startup screens have been displayed, the transmitter will show
the measurement screen.
1302-024
Figure 6 Measurement Screen (HMD83D)
If one of the transmitter’s error states is active, a notification symbol and
error text will appear on the screen. Depending on the error, the affected
measurement readings may be replaced by asterisks “*”. For more
information on the possible errors, see section Error Messages on the
Display on page 42.
Analog outputs of the HMDW80 series transmitters have a defined
behavior when the values measured by the transmitter are outside the
scaled analog output range:
- Output is clipped at the end of the range.
- Output is set to error state when measured value is 5% outside the
scaled range. See section Analog Output Error State on page 42.
- Output resumes normal function when measured value is back on the
scaled range.
NOTE
NOTE
HMW82/83 and TMW82/83 transmitters are different from the rest of
the HMDW80 series. Their analog output is clipped at 10% outside the
scaled range, and their analog outputs enter the error state when the
measured value is 20% outside the range.
For example, consider the temperature output of the HMD82 transmitter.
The output is 4 ... 20 mA, scaled to -40 ... +60 °C (-40 ... +140 °F).
- When measured temperature rises above +60 °C (+140 °F), the output
rises to 20 mA and stops rising even if temperature rises further.
- If the temperature rises above +65 °C (+149 °F), the output enters the
error state of 3.6 mA.
This overrange behavior does not mean there is a problem with the
measurements, and it does not affect the readings shown on the display
(if included in the transmitter model). The display always shows the
currently measured readings if the measurement is operating without
error. For more information on transmitter errors, see section Error
Messages on the Display on page 42.
This chapter provides you with information that is intended to help you
install HMDW80 series transmitters.
Selecting Location
When mounting duct model transmitters:
- Avoid installing in a location where condensation may fall on the
sensor inside the duct.
- Position the sensor in the center of the duct.
- Select a site where the transmitter can be installed horizontally, onto
the side of the duct.
When mounting wall model transmitters:
- Select a location that represents well the area of interest.
- Do not install on the ceiling.
- Avoid placing the transmitter near heat and moisture sources, close to
the discharge of the supply air ducts, and in direct sunlight.
When mounting outdoor transmitters:
- Install in a place that receives minimal direct sunlight. In the northern
hemisphere, the North side of the building typically provides a
suitable shaded location.
- Avoid placing the transmitter near windows, air conditioning units, or
other heat and moisture sources such as cooling towers.
- Install the transmitter at least 2.5 m above ground level.
- Medium size crosshead screwdriver (Pozidriv) for screws on
cover and flange.
- Small slotted screwdriver for screw terminals.
- Drill with 2.5 mm and 13 mm bits for making the installation
holes.
- Tools for cutting and stripping wires.
- 19 mm open-end wrench for tightening the cable gland.
1. Remove the yellow transport protection cap and separate the
fastening flange from the transmitter.
2. Use the flange to mark the location and size of the installation holes
on the side of the duct.
3. Drill the installation holes in the duct. Refer to Figure 8 below.
4. Secure the fastening flange to the duct with the two screws
(included).
5. Push the probe of the transmitter through the flange and into the
duct. The probe should reach far enough so that the sensor is
located in the middle of the duct.
6. Secure the transmitter to the flange by tightening the screw on the
flange that holds the probe in place.
7. Open the transmitter cover, and route the power and signal cable
through the cable gland. Connect the wires to the screw terminals.
Refer to section Wiring on page 26.
8. Check that the DIP switches (if present in your transmitter model)
are set as desired. See section DIP Switches on page 30.
9. Tighten the cable gland and close the transmitter cover.
Assess the risks posed by the height and accessibility of the installation
location, and plan your work so it is carried out safely. Try avoiding
work at height, if you can.
- Medium size crosshead screwdriver (Pozidriv)
- Small slotted screwdriver for screw terminals.
- Tools for cutting and stripping wires.
- 19 mm open-end wrench for tightening the cable gland.
Recommended pole diameter for HMS82/83 installation with the
supplied clamp and screws is 25 ... 60 mm.
1. Use the supplied clamp and screws to mount the transmitter on a
pole.
2. To prevent the transmitter from turning on the pole, tighten the set
screw on the center hole of the clamp.
1304-054
Figure 15 HMS82/83 Pole Installation
3. Plug in the screw terminal block, close the cover, and tighten the
screws.
4. Secure the cable to the pole using a zip tie. Allow some cable to
hang down from the cable gland to prevent water from entering the
transmitter along the cable.
Transmitters with a configurable humidity output parameter use the
marking HUM on the screw terminal labels. The default output
parameter is relative humidity (RH) with output scaled to 0 ... 100 %RH,
but the parameter can be changed using DIP switches. Changing the
parameter also changes the output scaling. See section DIP Switches on
page 30.
HMD82(D), HMW88(D), and HMS82
Two 4 ... 20 mA
outputs, temperature
output scaling
-40 ... +60 °C
(-40 ... +140 °F).
Alternate wiring with
one power supply.
TMD82
4 ... 20 mA output,
scaling -40 ... +60 °C
(-40 ... +140 °F).
Leave terminals 3 and 4
unconnected.
The DIP switches on the component board control the humidity output
parameter and scaling, and the units that are shown on the display.
The switches are present on the following models:
- HMD82(D) and HMD83(D)
- HMW88(D) and HMW89(D)
- HMS82 and HMS83
Figure 19 below shows the default position of the DIP switches. The
default settings are:
- Metric units shown on display.
- Relative humidity (RH) selected as humidity output parameter.
Do not attempt to clean contaminated INTERCAP
Instead,
purchased from Vaisala. For order codes, see secti
Accessories
CHAPTER 4
MAINTENANCE
This chapter provides information that is needed in basic maintenance of
HMDW80 series.
Cleaning
The body of the transmitter can be cleaned by wiping with a moistened
lint-free cloth. Do not use cleaning agents or solvents, or blow
pressurized air into the transmitter housing or on the filter.
NOTE
Calibration
You can verify the performance of your HMDW80 series transmitter by
comparing its reading with the reading from a portable reference
instrument such as the HM70 Hand-Held Humidity and Temperature
Meter. For operating instructions, refer to the documentation of your
reference instrument.
If the comparison indicates that the reading from the transmitter is not
within specification, the transmitter may need to have its filter and sensor
replaced.
®
sensors or filters.
replace them with new parts. Filters and sensors can be
1 = Vaisala INTERCAP® sensor. Handle by the plastic frame.
2 = Temperature sensor. Do not touch or attempt to remove.
3 = Sensor socket.
4 = Transmitter probe.
1
2
3
4
Replacing the INTERCAP® Humidity Sensor
HMDW80 series transmitters use the Vaisala INTERCAP® sensor for
humidity measurement. The INTERCAP® sensor is designed to be
replaced when necessary, and does not require adjustment by the user.
Replacing the INTERCAP® Sensor on
Models HMD82/83 and HMW88/89
REQUIRED
TOOLS
- New INTERCAP® humidity sensor.
- New filter (always recommended when replacing the sensor).
- Duct models only: medium size crosshead screwdriver (Pozidriv).
1. Power down the transmitter.
2. Duct models only: loosen the tightening screw on the fastening
flange, and pull the probe out of the duct.
3. Remove the filter to access the sensors. See Figure 20 below.
4. Pull out the old INTERCAP® sensor, and insert the new one.
5. Insert the new filter.
6. Duct models only: push the probe back into the duct, to the same
depth where it was before. Tighten the tightening screw on the
fastening flange.
7. Power up the transmitter.
8. Verify that the transmitter now provides a valid humidity reading.
Replacing the INTERCAP® Sensor on
Outdoor Models HMS82/83
REQUIRED
TOOLS
NOTE
- New INTERCAP® humidity sensor.
- New filter (always recommended when replacing the sensor).
- Medium size crosshead screwdriver (Pozidriv)
- Flat head screwdriver
- 3 mm hex key (Allen key) for opening the radiation shield screws.
- If transmitter mounted on pole: 2.5 mm hex key for opening and
tightening the set screw.
You will need to remove the radiation shield to access the sensor, and
this is difficult to do while the transmitter remains mounted on a pole or
wall. The procedure below takes advantage of the detachable screw
terminal to allow the cable to remain in place during the operation.
1. Power down the transmitter.
2. Open the transmitter cover and unplug the screw terminal. This
allows you to leave the cable and cover at the installation site.
1305-019
Figure 22 Unplugging the Screw Terminal
3. Remove the transmitter from its installation point.
Internal problem with the transmitter. Restart the
technical support if unable to remove the problem.
ERROR HUM
Humidity measurement failed. Check if the humidity
sensor is damaged or missing.
ERROR T
Temperature measurement failed. Check if the
temperature sensor is damaged or missing.
Analog Output Error State
HMDW80 series transmitters set the output channel(s) into a defined
error level instead of the measured result in two situations:
- Transmitter detects a measurement malfunction. This means an actual
measurement problem, such as sensor damage or unsuitable
environmental conditions.
- Measured value(s) are well outside the scaled output range. For a
more detailed explanation, see section Analog Output Overrange
Behavior on page 16.
The error level depends on the output type:
- For 0 ... 10 V output, the error level is 11 V.
HMW83 and TMW83 are an exception to this, their error level is 0 V.
- For 4 ... 20 mA output, the error level is 3.6 mA.
The transmitter resumes normal operation of the analog output(s) when
the cause of the error state is removed.
Error Messages on the Display
Table 8 Error Messages on the Display
INTERNAL 2
transmitter to see if the problem remains. Contact Vaisala