Vaisala HMDW110 User Manual

USER'S GUIDE

Vaisala HMDW110 Series Humidity and

Temperature Transmitters

M211726EN-A

PUBLISHED BY

Vaisala Oyj
Street address: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland
Mailing address: P.O. Box 26, FI-00421 Helsinki, Finland
Phone: [phone]
Fax: [phone]

Visit our Internet pages at www.vaisala.com.

© Vaisala 2014

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.

Table of Contents

1 General Information 3

About This Document 3
Documentation Conventions 3
Safety 4
ESD Protection 4
Recycling 4
Trademarks 4
Software License 5
Warranty 5

2 Product Overview 6

HMDW110 Series Overview 6
Output Parameters Explained 7
HMD110/112 Parts 8
HMW110/112 Parts 9
HMS110/112 Parts 10
Component Board 11
Analog Output Overrange Behavior 12

3 Installation 13

Selecting Location 13
HMD110/112 Installation 14
HMW110/112 Installation 16
HMS110/112 Installation 17
Wiring HMDW110 19

Wiring Both Current Loops With a Single Power Supply 20
HMDW110 Power Supply Requirements 20
Wiring HMDW110 with RDP100 21

4 Service Port 22

Connecting to the Service Port 22
Terminal Application Settings 23
Serial Commands 24
Device Information and Status 25
Serial Line Output and Communication 28

Measurement Output 28

Measurement Output Format 29

Serial Line Communication 31
Analog output 33
Calibration and Adjustment Commands 36
Other Commands 39

1

5 Maintenance 41

Cleaning 41
Calibration and Adjustment 41

Adjustment Types 42

Adjustment Points 42
Calibration and Adjustment Using a Hand-Held Meter and a
Reference Probe 43
One-Point Humidity Calibration and Adjustment Using a Hand-Held
Meter and HMK15 Humidity Calibrator 45
Two-Point Humidity Calibration and Adjustment using a computer
and a HMK15 Humidity Calibrator 46
Two-Point Temperature Calibration and Adjustment using a
Computer 49
Replacing the HUMICAP®Sensor on HMD110/112 and
HMW110/112 51
Replacing the HUMICAP®Sensor on HMS110/112 52

5 Troubleshooting 54

Error Messages 54
Technical Support 55
Product returns 55

6 Technical Data 56

Specifications 56
Dimensions 58
Spare Parts and Accessories 59

2

1 General Information

1 GENERAL INFORMATION

About This Document

This document provides information for installing, operating, and maintaining
HMDW110 series transmitters.

Table 1 Version Information

Docu ment Code Description

M211726EN-A This document. July2014. First version.

Table 2 Related Documents

Docu ment Code Description

M211692EN HMDW110 Series Quick Guide

M210297EN HM70 User's Guide

M210185EN HMK15 User's Guide

M211691EN RDP100 User's Guide

Documentation Conventions

Warnings alert 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.

Cautions warn 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.

Notes highlight important information on using the product.

3

1 General Information

Safety

The HMDW110 series transmitter delivered to you has been tested for safety
and approved as shipped from the factory. Note the following precautions:

Do not modify the unit. Improper modification can damage the
product or lead to malfunction.

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, avoid touching
exposed component contacts during installation and maintenance.

Recycling

Recycle all applicable material.

Dispose of the unit according to statutory regulations. Do not
dispose of with regular household refuse.

Trademarks

HUMICAP®is a registered trademark of Vaisala Oyj.

Windows®is a registered trademark of Microsoft Corporation.

All other trademarks referred to are the property of their respective owners.

4

1 General Information

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 more information and our 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.

5

2 Product Overview

2 PRODUCT OVERVIEW

HMDW110 Series Overview

HMDW110 series transmitters are accurate humidity and temperature
transmitters for measurements in HVAC and cleanroom applications. The series
consists of the following models:

n HMD110/112 models for installation in ventilation ducts

n HMW110/112 models for wall installation

n HMS110/112 models for outdoor use

All models are loop-powered, with 2-wire current outputs for humidity and
temperature. HMD112, HMW112, and HMS112 are standard models. HMD110,
HMW110, and HMS110 are factory configurable models that are delivered with
customer specific output settings, including calculated humidity parameters and
special scaling of outputs.

HMDW110 series transmitters can be connected to Vaisala’s RDP100 panel
display for real-time viewing of the measurements. HMDW110 series can also
supply the operating power to the display using only the loop power from the
outputs.

6

2 Product Overview

Output Parameters Explained

HMDW110 series transmitters offer several output parameters. Relative humidity
(RH) and temperature (T) are the measured parameters, the others are
calculated based on RH and T.

Table 3 HMDW110 Series Output Parameters

Parameter Symbol Units Description

Temperature T °C

Relative
humidity

Dewpoint Td/f °C

Enthalpy h kJ/kg

Wet bulb
temperature

RH % Ratio of the partial pressure of water vapor in the air to

Tw °C

°F

°F

BTU/lb

°F

Check the type label on your transmitter to verify its output
parameters and scaling of the output channels.

Temperature in Celsius or Fahrenheit scale.

the saturation vapor pressure of air at current
temperature.

Temperature at which the water vapor in the air will
condense into water at the current pressure. When the
dewpoint is below 0 °C, the transmitter outputs frostpoint
(Tf) instead of dewpoint.

Sum of the internal energy of a ther modynamic system.

The minimum temperature that can be r eached by
evaporative cooling in the current conditions.

7

2 Product Overview

HMD110/112 Parts

Figure 1 HMD110/112 Parts

1 = PTFE membrane filter.
2 = Sensors for humidity and temperature.
3 = Fastening flange.
4 = Tightening screw for fastening flange.
5 = Type label.
6 = Transmitter cover.
7 = Component board. See Component Board on page11.
8 = Cable glands for 4 ... 8 mm diameter cable.

8

HMW110/112 Parts

Figure 2 HMW110/112 Parts

1 = Screw holes for mounting (2 pcs).
2 = Cable gland.
3 = Sensors for humidity and temperature.
4 = PTFE filter.
5 = Type label.
6 = Component board. See Component Board on page11.
7 = Probe.
8 = Transmitter cover with captive screws.

2 Product Overview

9

2 Product Overview

HMS110/112 Parts

Figure 3 HMS110/112 Parts

1 = Radiation shield. Do not remove for installation, only when replacing the

sensor or filter.

2 = Long screws that keep the radiation shield in place (2 pcs),

3mmhexsocket.
3 = Sensors for humidity and temperature under PTFE membrane filter.
4 = Component board. See Component Board on the facing page.
5 = Transmitter body.
6 = Screws for pole mounting (2 pcs, medium size Pozidriv).
7 = Clamp for pole mounting. The holes are threaded for the included pole

mounting screws and set screw.
8 = Set screw (medium size Pozidriv). Install after pole mounting to stop the

transmitter from turning.
9 = Medium size crosshead screws (6 pcs).
10 = Transmitter cover.
11 = Cable gland. Suitable for 4 ... 8 mm diameter cable.

10

2 Product Overview

Component Board

All HMDW110 transmitter models use the same component board and have two
4...20 mA outputs (loop powered). There is also a service port for configuration
and calibration use.

Figure 4 HMDW110 Series Compo nen t Board

1 = Terminal block for 4 ... 20 mA current loop outputs.
2 = Service port connector (4-pin M8).
3 = Terminal block for RS-485 output to RDP100 display panel (optional).

You can pull out the terminal blocks from the component board
for easier installation, and to disconnect the transmitter from
power and RS-485 when using the service port.

11

2 Product Overview

Analog Output Overrange Behavior

Analog outputs of the HMDW100 series transmitters have a defined behavior
when the values measured by the transmitter are outside the scaled analog
output range:

n Output is clipped at the end of the scaled output range.

n You can allow the output exceed the scaled range by 10%with the aover

serial command.

n Output is set to error state (default 3.6 mA)if an error is active (for example,

due to sensor damage). You can change the error state using the aerr
command.

For configuration of the analog outputs using serial commands, see section
Analog output on page33.

12

3 I nstallation

3 INSTALLATION

Selecting Location

When mounting duct model transmitters:

n Avoid installing in a location where condensation may fall on the sensor

inside the duct.

n Position the sensor in the center of the duct.

n Select a site where the transmitter can be installed horizontally, onto the side

of the duct. Do not point the probe downward, as this will make condensation
run down to the sensor.

When mounting wall model transmitters:

n Select a location that represents well the area of interest.

n Do not install on the ceiling.

n 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:

n Install in a location with a good airflow around the transmitter.

n Avoid placing the transmitter near windows, air conditioning units, or other

heat and moisture sources such as cooling towers.

n Install the transmitter at least 2.5 m above ground level.

13

3 I nstallation

HMD110/112 Installation

n Medium size crosshead screwdriver (Pozidriv) for screws on

cover and flange.

n Small slotted screwdriver for screw terminals.

n Drill with 2.5 mm and 13 mm bits for making the installation

holes.

n Tools for cutting and stripping wires.

n 19 mm open-end wrench for tightening the cable gland.

Figure 5 HMD110/112 Installation

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. Secure the fastening flange to the duct
with the two screws (included).

14

3 I nstallation

4. 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.

Figure 6 HMD110/112 Centering Inside Duct

5. Secure the transmitter to the flange by tightening the screw on the flange
that holds the probe in place.

6. Open the transmitter cover, and route the cables through the cable glands.
Connect the wires to the screw terminals according to the wiring
instructions:

o

Wiring HMDW110 on page19

o

Wiring HMDW110 with RDP100 on page21

For the arrangement of the screw terminals, see section Component Board
on page11.

7. Tighten the cable gland(s) and close the transmitter cover.

15

3 I nstallation

HMW110/112 Installation

n Medium size crosshead screwdriver (Pozidriv) for cover

screws.

n Small slotted screwdriver for screw terminals.

n Two installation screws: Ø ≤ 3.5 mm, head Ø≤8mm.

n Depending on the wall material and screw type, you may

need a drill and a suitable drill bit to make installation holes
for screws.

n Tools for cutting and stripping wires.

n 19 mm open-end wrench for tightening the cable gland.

Figure 7 HMW110/112 Installation

1. Open the transmitter cover and use two screws (not included) to attach the
transmitter to the wall. The probe and cable gland should point down.

16

3 I nstallation

2. Open the transmitter cover, and route the cable through the cable gland.
Connect the wires to the screw terminals according to the wiring
instructions:

o

Wiring HMDW110 on page19

o

Wiring HMDW110 with RDP100 on page21

For the arrangement of the screw terminals, see section Component Board
on page11.

3. Tighten the cable gland and close the transmitter cover.

4. Remove the yellow transport protection cap from the probe.

HMS110/112 Installation

n Medium size crosshead screwdriver (Pozidriv).

n Small slotted screwdriver for screw terminals.

n Tools for cutting and stripping wires.

n 19 mm open-end wrench for tightening the cable gland.

Additional tools for pole installation:

n Zip ties for securing the cable to the pole.

Additional tools for wall installation:

n Drill and bits.

n Screws (2 pcs, Ø < 5.5 mm) and wall plugs.

n Cable clips for securing the cable to the wall.

1. Open the six screws that hold the
transmitter cover.

2. Route the power and signal cable
through the cable gland, and
connect the wires to the screw
terminals according to the wiring
instructions:

o

Wiring HMDW110 on page19

o

Wiring HMDW110 with
RDP100 on page21

For the arrangement of the screw
terminals, see section
Component Board on page11.

17

100 mm

Ø 5.5 mm

3 I nstallation

3. Adjust the length of cable
between the cable gland and the
terminal blocks. Make the cable
short enough to close the cover
without leaving a cable loop in
the transmitter.

4. Disconnect the wired screw
terminal blocks by pulling them
off from the component board.

5. Mount the transmitter according
to the type of the installation site:

o

Pole installation

a. Use the supplied clamp

and screws to mount the
transmitter on a pole.

b. To prevent the transmitter

from turning on the pole,
tighten the set screw on
the center hole of the
clamp.

o

Wall installation

a. Drill two holes for wall

plugs 100 mm apart.

b. Place the wall plugs in the

holes.

c. Mount the transmitter

using two screws of
sufficient length.

18

6. Plug in the screw terminal blocks,
close the cover, and tighten the
screws.

7. Secure the cable to the pole
using a zip tie, or on the wall
using cable clips. Allow some
cable to hang down from the
cable gland to prevent water from
entering the transmitter along the
cable.

Wiring HMDW110

You must always connect the humidity measurement current loop (HUM,
terminals 5and 6) to power the transmitter. Connecting the temperature
measurement current loop (terminals 7 and 8) is optional.

3 I nstallation

Figure 8 HMDW110 Wiring

Terminals 1 ... 4 are for use with the RDP100 remote display
panel. For wiring instructions, see section Wiring HMDW110 with
RDP100 on page21.

19

3 I nstallation

Wiring Both Current Loops With a Single Power Supply

Figure 9 HMDW110 Wiring with Single Power Sup ply

HMDW110 Power Supply Requirements

HMDW110 series transmitters are designed for a supply voltage range of
10...28VDC. The minimum required voltage depends on the loop resistance
(0...600Ω) as shown below.

Figure 10 HMDW110 Supply Voltage Operating Region

20

3 I nstallation

Wiring HMDW110 with RDP100

You must always connect the humidity measurement current loop (HUM,
terminals 5and 6) to power the transmitter. Connecting the temperature
measurement current loop (terminals 7 and 8) is optional.

Connect the RDP100 Remote Display Panel using terminals 1 ... 4. The
HMDW110 series transmitter provides both power and data to the RDP100.

Figure 11 HMDW110 Wiring with RDP100 Remote Display Panel

When using the RDP100 with HMDW110 series transmitters, do
not connect the Extpwr jumper to the RDP100 component board.

21

4 Service Port

4 SERVICE PORT

Connecting to the Service Port

n Computer with

o

Windows operating system

o

Terminal application

o

Free USBport

o

Driver for Vaisala USB cable installed

n Vaisala USB cable for computer connection (219690)

OR

n Vaisala MI70 Hand-Held Indicator

n MI70 connection cable (219980SP)

The RS-485 line of the service port is shared with the connection to RDP100
display panel; the M8 service port connector is just an additional connector for
easier access. You can use the service port for configuration, calibration, and
troubleshooting of the transmitter.

Before plugging in a connection cable to the service port, perform the following
steps:

1. Open the cover of the HMDW110 series transmitter.

2. If the terminal block for terminals 5...8 is wired, pull it out. This disconnects
the transmitter from supply voltage and prevents possible equipment
damage that may be caused by ground loops. The locations of the terminal
blocks and the service port are shown in section Component Board on
page11.

3. If the other terminal block is wired (terminals 1 ... 4), pull it out also. This
prevents the communication between the transmitter and RDP100 remote
display panel from interfering with your connection.

22

4 Service Port

Terminal Application Settings

You need a terminal application to be able to use the service port commands of
the HMDW110 series transmitter. You can download the PuTTY terminal
application from www.vaisala.com or use a terminal application of your choice.

Figure 12 PuTTYTerminal Application

Before starting a terminal session, you must set the following parameters:

n Serial line settings. The default serial line settings of a HMDW110 series

transmitter are 19200 N 8 1:

o

19200 bits per second

o

No parity

o

Eight data bits

o

One stop bit

n Number of the virtual COMport that has been created for your cable by the

Vaisala USBdriver. You can check which port the USB cable is using with the
Vaisala USB Device Finder application that has been installed in the
Windows Start menu. You can also access the USBfinder directly from the
Vaisala-supplied PuTTYapplication by clicking on the USBFinder... button
on the Serial &USBtab.

The default serial line settings are needed for compatibility with
the RDP100 remote display panel. If you are not using the
display, you can change the settings using the seri command.
Note that the service port settings will also change.

23

4 Service Port

Serial Commands

The notation <cr> refers to the carriage return control character, which you can
send in a terminal application by pressing enter on your keyboard. Before
entering commands, send a <cr> to clear the command buffer.

You can enter the commands in uppercase or lowercase. In the command
examples, the keyboard input by the user is in bold type.

Table 4 HMDW110 Serial Commands

Command Description Page

Device information and status

?

??

errs

help

system

time

Serial line output and communication

addr

close

form

intv

open

r

s

sdelay

send

seri

smode

unit

Analog output

aerr

amode

aover

asel

atest

Calibration and adjustment

crh

Show device information. 25

Show device information (will respond in poll mode). 25

Show active errors. 26

Show listof serial commands. 27

Show firmwar e information. 27

Show transmitter uptime ( time sincelast reset). 28

Show or set device address. 31

Close connection to device in POLL mode. 31

Set output format of measurement messages. 30

Set measurement output interval. 29

Open connectionto device in POLL mode. 31

Start continuous output of measurement messages. 28

Stop continuous output of measurement messages.

Show or set serial line turnaround delay. 32

Output one measurement message. 28

Set serial line settings. Default is 19200 N 8 1. 32

Set serial line operation mode. 33

Set units to metric (m) or non-metric (n). 29

Show or set error level for analog output. 33

Show analog output settings. 34

Enable or disable analog output 10% over range. 34

Show or set analog output parameters and scaling. 35

Test analog outputs by forcing them to a given value. 36

User calibration for humidity measurement. 36

29

24

4 Service Port

Command Description Page

crhclr

Clear user calibration for humidity measurement.

37

Factorycalibration remains.

ct

ctclr

User calibration for T measurement. 37

Clear user calibration for temper ature measurement. Factory

37

calibration remains.

fcrh

l

li

Two- point calibration after humidity sensor change. 38

Show adjustment offset and gain. 38

Set adjustment offset and gain. 39

Other commands

filt

frestore

Show or set measurement filtering. 39

Restore factory settings. Clears all user settings, factory

40

calibration remains.

reset

Reset the device. 40

Device Information and Status

Table 5 ? Command

Syntax Description

?<cr>

??<cr>

Example:

?

HMD 112 / 1.0 .6
Ser ial n um ber : H 01340 07
Bat ch n umber : H0130 002
Sen sor n um ber : H 00900 03
Sen sor m od el : H umica p 18 0R
Ord er c ode : H MD110 2A1VA 1
Cal . da te : 2 01406 19
Cal . in fo : V AISAL A/HEL
Tim e : 01 :43:4 3
Ser ial m od e : S TOP
Bau d P D S : 192 00 N 8 1
Out put i nt erv al : 5 S
Ser ial d el ay : 25
Add ress : 0
Fil ter : 1.0 00
Ch1 out put : 4 . .. 2 0 m A
Ch2 out put : 4 . .. 2 0 m A
Ch1 RH lo : 0.0 0 % RH
Ch1 RH hi : 100 .00 % RH
Ch2 T lo : -40 .00 ' C
Ch2 T hi : 60 .00 ' C

Show listing of device information.

Show listing of device information even if
device is in poll mode and connection has not
been opened using the

open

command.

25

4 Service Port

Table 6 Errs Command

Syntax Description

errs<cr>

Show active error( s). Possible error
messages are listed below. For more
information, see Error Messages on
page54.

n No errors

n T meas error

n Fmeaserror

n RH sensor failure

n T ambient error

n Program flash check sum error

n Parameter flash check sum error

o

INFOA check sum error

o

SCOEFS checksum error

o

CURRENT check sum error

n Unknown error

Example (no active errors):

err s

000 0h
No erro rs

26

Table 7 Help Command

Syntax Description

help<cr>

Show listof currently available serial
commands.

Example:

hel p

?
??
ADD R
AER R
AMO DE
AOV ER
ASE L
ATE ST
CLO SE
CRH
CRH CLR
CT
CTC LR
ERR S
FCR H
FIL T
FOR M
FRE STORE
HEL P
INT V
L
LI
OPE N
R
RES ET
SDE LAY
SEN D
SER I
SMO DE
SYS TEM
TIM E
UNI T

4 Service Port

Table 8 System Command

Syntax Description

system<cr>

Show firmwar e information.

Example:

ver s

Dev ice N am e : H MD 112
Cop yrigh t : Co pyrig ht ( c) Vais ala O yj 2 013 . Al l ri ght s
res erved .
SW Name : HMD 11 2
SW date : 201 4- 04- 14
SW vers ion : 1 .0.6

27

4 Service Port

Table 9 Time Command

Syntax Description

time<cr>

Show transmitter uptime ( time sincelast
reset) in hh:mm:ss.

Example:

tim e

Tim e : 00 :54:5 1

Serial Line Output and Communication

Measurement Output

Table 10 Send Command

Syntax Description

send<cr>

send [aaa]<cr>

Example:

sen d 5

T= 22.8 ' C RH = 39.8 %RH Td = 8.4 'C T w= 1 4.6 ' C h= 40.5 k J/kg

Table 11 R Command

Syntax Description

r<cr>

Example (measurement message in default format):

r

T= 22.8 ' C RH = 39.5 %RH Td = 8.3 'C T w= 1 4.5 ' C h= 40.4 k J/kg
T= 22.8 ' C RH = 39.5 %RH Td = 8.3 'C T w= 1 4.5 ' C h= 40.4 k J/kg
...

Output a single measurement message.

Output a single measurement message from
the device with the defined address:

aaa=address of tar get device, range

0...255.

Start the continuous outputting of
measurement values as an ASCII text string
to the serial line.

28

Table 12 S Command

Syntax Description

s<cr>

Stop the continuous outputting of
measurement values.

Example:

...
T= 22.8 ' C RH = 39.5 %RH Td = 8.3 'C T w= 1 4.5 ' C h= 40.4 k J/kg
T= 22.8 ' C RH = 39.5 %RH Td = 8.3 'C T w= 1 4.5 ' C h= 40.4 k J/kg

s

Since the interface is half-duplex, you must enter the s command
when the device is not outputting.

Table 13 Intv Command

Syntax Description

intv<cr>

intv [iii u]<cr>

Example:

int v 5 s

Out put i nt erv al : 5 S

Show the output interval of the automatically
repeating measurement messages (
command and run mode).

Set the output interval.

iii= interval, range 0 ... 255.

u =unit for interval setting:

n s =seconds

n m = minutes

n h = hours

If you set the interval to 0, the output
messages are output as quicklyas they are
generated, without additional delay.

4 Service Port

r

Measurement Output Format

Table 14 Unit Command

Syntax Description

unit<cr>

unit [m|n]<cr>

Example (set units to non-metric):

uni t n

Uni ts : N on m etric

Show current setting of the unit command.

Set types of units used on the serial line.

m = metric units, for example, Celsius

n = non-metric units, for example, Fahrenheit

29

4 Service Port

Table 15 Form Co mmand

Syntax Description

form<cr>

Show the currently used measurement
format.

form /<cr>

form [sss]<cr>

Reset measurement format to default.

Set a new measurement format.

sss=String consisting of modifiers and
abbreviations for measured parameters.
See the tables below. Maximum length 127
characters.

Example:show currently used measurement format (default format shown):

for m

3.1 "T= " T " " U3 3 .1 " RH=" RH " " U4 3. 1 "T d=" T d " " U3 3 .1 "Tw= " Tw
" " U3 4.1 "h =" h " " U 7 \r \ n

Output example:

sen d

T= 25.1 ' C RH = 39.4 %RH Td = 10 .3 ' C T w= 1 6.2 ' C h= 45. 1 k J/ kg

Example:set output format as RH and T, with start of text (ASCII character 002) and end of
text (003) ASCII codes, and without linefeed and carriage return at the end:

for m #0 02 3.1 "RH= " RH U 4 3.1 " T=" T " " U3 #003

OK

Output example (ASCII codes not visiblehere) :

sen d

RH= 39. 3%RH T= 2 5.1 ' C

Table 16 Output Parameters for Form Co mmand

Measured Parameter Abbreviation in Form Command

Temperature

Relative humidity

Dewpoint

Enthalpy

Wet bulb temperatur e

Table 17 Modi fiers for Form Command

t

rh

td

h

tw

Modifier Description

x.y

\t

\r

\n

\xxx

""

Length modifier (number of digits and decimalplaces).

Tabulator.

Carriage return.

Line feed.

ASCII character with decimal code

xxx

.

String constant.

30

Modifier Description

ux

Name of the measurement unit usingxnumber of characters. For
example, u3 shows the name of the measurement unit with three
characters.

addr

sn

time

cs4

Transmitter address.

Transmitter serial number.

Time since transmitter was started or reset.

Modulus-65536 checksum of message sent so far, ASCII encoded
hexadecimalnotation.

csx

NMEA xor-checksum of message sent so far, ASCII encoded
hexadecimalnotation

You can also use the hash character # instead of the backslash
character \.

Serial Line Communication

Table 18 Open Command

Syntax Description

open [aaa]<cr>

Example:

ope n 5

HMD 112 5 li ne o pened f or o perat or c omm an ds

Open a connection to a device at the
specified address. Required when device is
in poll mode. Addressrange 0 ... 255.

4 Service Port

Table 19 Close Command

Syntax Description

close<cr>

Close the connection that was opened with

open

the

command.

Example:

clo se

lin e cl osed

Table 20 Addr Command

Syntax Description

addr<cr>

Show current deviceaddressand prompt for
a new address.

addr [aaa]<cr>

Set new device address.

aaa=0 ... 255.

Example (shows 0 as current address, enter 5 as the new address):

add r
Add ress : 0 ? 5

31

4 Service Port

Table 21 Seri Command

Syntax Description

seri<cr>

seri [baud p d s]<cr>

Show current serial line settings.

Set new serial line settings for RS-485 line
(also affects the service port). T he new
settingsare taken into use when the device is
reset or powered up.

baud =baud rate (9600, 19200, or 38400).

p = parity

n n = none

n e = even

n o = odd

d = data bits (7 or 8) .

s = stop bits (1 or 2).

Example (show current serialline settings):

ser i

Bau d P D S : 192 00 N 8 1

Keep the serial line settings at default (19200 N 8 1) for
compatibility with the RDP100 remote display panel.

Table 22 Sdelay C ommand

Syntax Description

sdelay<cr>

sdelay [ddd]<cr>

Show serial line delay (response time).

Set serial line delay (response time).

ddd=delay,range 0 ... 255. Corresponds to
0 ... 1020 milliseconds.

Example (set serialline delay to 200 milliseconds):

sde lay 5 0

Ser ial d el ay : 50

32

Table 23 Smode Command

Syntax Description

smode<cr>

Show current start-up operating mode of the
serial line, and prompt to enter new mode.
New mode is taken into use when the device
is reset or powered up.

smode [mode]<cr>

Set serial line start-up oper ating mode.
Available modes are:

stop =No automaticoutput. All commands
available. Default mode.

run=Automaticoutput of measurement
messages. You must stop output with the s
command before entering other commands.

poll = No automatic output. Willrespond to
addressed send command and ??
command. You can use other commands
after opening a connection using an
addressed open command.

Example (set device to poll mode):

smo de
Ser ial m od e : S TOP ? p oll

Analog output

4 Service Port

Table 24 Aerr Command

Syntax Description

aerr ?<cr>

Show currently set analog output error level
for both channels.

aerr<cr>

Show currently set analog output error
levels, prompt to enter new values.

aerr [ch1] [ch2]<cr>

Set error level for both channels without
prompting.

ch1= error levelfor analog output channel 1
in mA.

ch2= error levelfor analog output channel 2
in mA.

Example (set error levelfor both analog output channels to 21 mA):

aer r

Ch1 err or o ut : 3.60 0 I ? 21
Ch2 err or o ut : 3.60 0 I ? 21

33

4 Service Port

Table 25 Amode Command

Syntax Description

amode<cr>

Show currently set analog output mode.

Example:

amo de

Ch1 out put : 4 . .. 2 0 m A
Ch2 out put : 4 . .. 2 0 m A

Table 26 Aover Command

Syntax Description

aover<cr>

aover [on|off]<cr>

Show current aover status.

Set analog output overrange to:

on = Allow output to exceed the scaled range
by 10%.

off= Keep the analog output always in the
scaled range. Note that error state behavior
overrides this setting.

Example (enable 10% overrange for analog outputs):

aov er o n

AOV ER : ON

34

Table 27 Asel Command

Syntax Description

asel ?<cr>

Show currently set analog output
parameters and scaling.

asel<cr>

Show currently set analog output
parameters and scaling, prompt to enter new
scaling values.

asel [ch1 ch2]<cr>

Set new output parameters for both
channels, prompt to enter new scaling
values.Selectable parameters for ch1and

ch2ar e:

t = temperature

rh = relative humidity

td = dewpoint

h = enthalpy

tw = wet bulb temperature

asel [ch1ch2
[ch1loch1hich2loch2hi]]<cr>

Set analog output parameters and scaling for
both channels without prompting.

ch1= Output parameter for channel 1.
Parameters as above.

ch2= Output parameter for channel 2.
Parameters as above.

ch1lo = Low limit for channel 1 scaling.

ch1hi= High limit for channel 1 scaling.

ch2lo= Low limit for channel 2 scaling.

ch2hi=High limit for channel 2 scaling.

Example (show current analog output parameters and scaling):

ase l ?

Ch1 RH lo : 0.0 0 % RH
Ch1 RH hi : 100 .00 % RH
Ch2 T lo : -40 .00 ' C
Ch2 T hi : 60 .00 ' C

4 Service Port

35

4 Service Port

Table 28 Atest Co mmand

Syntax Description

atest [ch1 ch2]<cr>

Set analog channelsto defined output value
(in mA).

ch1= Output value for channel 1.

ch2= Output value for channel 2.

atest<cr>

End analog output testing mode, return
outputs to normal.

Example (set both channelsto 20 mA, then return them to normal measurement):

ate st 2 0 20

20. 000 263 93

20. 000 263 93

ate st

6.6 94 2639 3

12. 297 263 93

Calibration and Adjustment Commands

Before using the calibration and adjustment commands, read
through section Calibration and Adjustment on page41.

Table 29 Crh C ommand

Syntax Description

crh<cr>

crh [ref]<cr>

Example :

crh

RH : 11.5379 1. ref ? 11.3
Press any key when ready ...
RH : 74.9684 2. ref ? 75.4
OK

Start the two-point humidity calibration and
adjustment sequence. For a full adjustment
procedure, see section Two-Point Humidity
Calibration and Adjustment using a computer
and a HMK15 HumidityCalibrator on
page46.

Perform a one-point adjustment at the
current relative humidity. The device
calculates the required correction based on
the reference humidity that you enter.

ref=the correct relative humidityat the
environment where the sensor is now.

36

Table 30 Crhclr Command

Syntax Description

crhclr<cr>

Clear the current user adjustment for
humidity. Factory calibration remains.

Example:

crh clr

OK

Table 31 Ct Command

Syntax Description

ct<cr>

Start the two-point temperature calibration
and adjustment sequence. For a full
adjustment procedure, see section Two­Point Temperature Calibration and
Adjustment using a Computer on page49.

ct [ref]<cr>

Perform a one-point adjustment at the
current temperature. The device calculates
the required correction based on the
reference temperatur e that you enter.

ref=the correct temperature (in degrees
Celcius) at the environment where the
sensor isnow.

Example :

ct

T : 22.9424 1. ref ? 23.0
Press any key when ready ...
T : 54.9873 2. ref ? 55
OK

4 Service Port

Table 32 Ctclr Command

Syntax Description

ctclr<cr>

Clear the current user adjustment for
temperature. Factory calibration remains.

Example:

ctc lr

OK

37

4 Service Port

Table 33 Fcrh Command

Syntax Description

fcrh<cr>

Start the two-point humidity calibration and
adjustment sequence. If you have changed
the humidity sensor of the device yourself,
you must per form a two-point humidity
calibration and adjustment using this
command. Follow the procedure in section
Two- Point Humidity Calibration and
Adjustment using a computer and a HMK15
Humidity Calibrator on page46

.

Example:

fcr h

RH : 11.3143 1. ref ? 11.3
Press any key when ready ...
RH : 75.0012 2. ref ? 75.4
OK

Table 34 L Command

Syntax Description

l<cr>

Show the current offset and gain parameter s
for user adjustment. This command is useful
for checking if user adjustments have been
applied for humidity and temperature
measurement.

Example (shows default state without user adjustments - offset is 0 and gain is1 for both
humidity (Cp offset and gain) and temperature):

l

Cp offs et : 0.000 00000 E+00
Cp gain : 1.0 000 00 00E +0 0
T offse t : 0.0 000 00 00E +0 0
T gain : 1 .0000 0000E +00

38

4 Service Port

Table 35 Li Command

Syntax Description

li<cr>

Enter values for offset and gain parameters
for user adjustment. Useful for restoring
some earlier state of user adjustment.

Use this command only to
restore values you have
previouslywritten down based
on the output from the l
command, or to restore the
default offset and gain.

Example (shows adjustment has been applied to humidity measurement offset, overwrites it
with 0):

li

Cp offs et : -1.509 22060 E-01 ? 0
Cp gain : 1.0 000 00 00E +0 0 ?
T offse t : 0.0 000 00 00E +0 0 ?
T gain : 1 .0000 0000E +00 ?

Other Commands

Table 36 Filt Command

Syntax Description

filt [f.fff]<cr>

filt<cr>

Example (view the current value and set filtering to value 0.5):

fil t
Fil ter : 1.0 00 ? 0.5

Set the speed at which the latest
measurement result is integrated into the
humidity and temperature r eadings. The
command affects both analog output and
serial line output.

f.fff= Measurement filtering setting, range

0.001 ... 1.0.

n 1.0 = No filtering, latest measurement is

output without averaging

n 0.5 = Average of last two measurements

n 0.1 = Average of approximately 16

measurements

View the current setting. Also prompts you to
enter a new value.

39

4 Service Port

Table 37 Frestore Command

Syntax Description

frestore<cr>

Restores the factory default settings. All
user-made settingsare lost, including user
calibration. Reset the transmitter after giving
this command.

Example:

fre store

Fac tory sett ings re st ore d

res et

HMD 112 / 1.0 .6

Table 38 Reset Command

Syntax Description

reset<cr>

Resets the device.

Example:

res et

HMD 112 / 1.0 .6

If you have replaced the
HUMICAP®humidity sensor of
the device yourself, you must
redo the two-point humidity
calibration using the FCRH
command after per forming a
factory reset.

40

5 Maintenance

5 MAINTENANCE

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.

Do not attempt to clean contaminated HUMICAP®sensors or
filters. Instead, replace them with new parts. Filters and sensors
can be purchased from Vaisala. For order codes, see Spare
Parts and Accessories on page59.

Calibration and Adjustment

Calibration means comparing the instrument to a known

reference, either against a second instrument or a known
reference environment. Correcting the reading of the instrument
so that is measures accurately is referred to as adjustment.

Performing an accurate calibration and adjustment takes some
time and preparation. Instead of doing it yourself, you can also
have a Vaisala service center calibrate and adjust your
transmitter. For contact information, see section Product returns
on page55.

HMDW110 series transmitters are fully calibrated as shipped from factory. You
can use the service port to calibrate and adjust the humidity and temperature
measurement of the transmitter as needed. If you think the transmitter is not
measuring correctly, check the following before starting any calibration and
adjustment procedure:

41

5 Maintenance

n Always wait for measurement instruments to stabilize in the ambient

temperature. Temperature differences are a major source of measurement
error.

n Check that there are no heat or moisture sources near the transmitter.

n Check that the transmitter is not in direct sunlight or close to the discharge of

the supply air ducts.

n Check that there is no moisture on the probe. If the sensor has become wet,

you must allow it to dry before you can measure.

Adjustment Types

You can perform a one-point calibration and adjustment with Vaisala hand-held
meters that utilize the MI70 measurement indicator (for example, HM70). See the
following sections:

n Calibration and Adjustment Using a Hand-Held Meter and a Reference

Probe on the facing page

n One-Point Humidity Calibration and Adjustment Using a Hand-Held Meter

and HMK15 Humidity Calibrator on page45

Connecting to the service port using a computer and a terminal program allows
you to perform calibration and adjustment tasks using serial commands. You
can, for example, perform a two-point humidity calibration and adjustment, or
clear the existing user adjustments (factory calibration will remain). See the
following sections:

n Calibration and Adjustment Commands on page36

n Two-Point Temperature Calibration and Adjustment using a Computer on

page49

n Two-Point Humidity Calibration and Adjustment using a computer and a

HMK15 Humidity Calibrator on page46

If you replace the HUMICAP®humidity sensor of the
transmitter, you must perform the two-point humidity calibration
afterward.

Adjustment Points

HMDW110 series transmitters have two adjustment points for both humidity
measurement and temperature measurement:

n The first point (low point) affects offset across the entire measurement range.

For humidity adjustment, the low point must be < 50 %RH.

42

5 Maintenance

n The second point (high point) affects measurement gain. For humidity

adjustment, the high point must be > 50 %RH.

Additionally, two-point humidity calibration requires that the difference between
the two points is ≥ 30 %RH.

Temperature adjustment points must be in range -40...+60°C (-40 ... +140 °F)
with more than 30 °C (86 °F) difference.

Calibration and Adjustment Using a Hand-Held Meter and a Reference Probe

n A fully charged Vaisala MI70 indicator (the measurement

display that is included in the HM70 package)

n A calibrated reference probe that is compatible with the MI70

indicator (for example, HMP75) and its MI70 connection
cable, if not integrated with the probe

n Connection cable for HM70 hand-held meter (219980SP)

n Medium size cross-head screwdriver (Pozidriv).

1. Insert the reference probe in the same environment as the probe of the
HMDW110 series transmitter. You can also perform this procedure in the
ambient environment, as long as it is reasonably stable.

2. Connect the reference probe to port Iof the MI70 indicator (the
measurement display that is included in the HM70 package).

3. Prepare the HMDW110 series transmitter for a service port connection as
instructed in section Connecting to the Service Port on page22.

4. Plug in the connection cable 219980SPto the service port of the HMDW110
series transmitter, and the other end to port IIof the MI70 indicator.

5. Turn on the MI70 indicator.

6. Check and adjust the environment settings of the reference probe if
prompted by the MI70.

7. Select Functions > Adjustments (II) from the menu of the MI70 and select
Start. Make sure the symbol for port IIis shown after the word
"Adjustments", as your reference probe may also be adjustable using the
MI70.

8. The adjustment mode starts. Select OK.

43

5 Maintenance

9. Select the parameter for adjustment. You can only adjust relative humidity
(RH) or temperature (T). The rest of the parameters are calculated based on
RHand Tand can only be viewed.

10. Check and adjust the environment settings of the reference probe if
prompted by the MI70.

11. The adjustment mode now shows the value of the selected parameter from
both instruments, and a delta parameter (for example, ΔRH) that shows the
difference between the two. Wait at least 15 minutes for the measurement to
stabilize, and for the value of the delta parameter to stop changing.
Stabilization may take a much longer time, depending on factors such as
temperature differences and airflow around the sensors.

12. The difference between the reading should be no greater than the
combined measurement uncertainty of the HMDW110 series transmitter
and the reference probe. Depending on the result, proceed as follows:

o

If the HMDW110 series transmitter is within its accuracy specification,
there is no need to proceed with the adjustment. Select Back and Exit to
leave the adjustment mode.

o

If adjustment is required, continue with the next step.

13. Select Adjust, and then select To same as RH(I).

14. The MI70 will ask Do you really want to adjust? Select Yes. MI70 shows
the text Adjustment done and returns to the adjustment mode after a few
seconds. Check the value of the delta parameter to verify that the
adjustment has taken effect.

15. Select Back to return to the parameter selection screen.

16. Select a new parameter for adjustment and proceed as instructed above, or
select Exit to leave the adjustment mode.

17. Turn off the MI70 indicator and disconnect the connection cable from the
service port.

18. Reconnect the terminal blocks and close the cover.

44

5 Maintenance

One-Point Humidity Calibration and Adjustment
Using a Hand-Held Meter and HMK15 Humidity
Calibrator

n A fully charged Vaisala MI70 indicator (the measurement

display that is included in the HM70 package)

n Vaisala HMK15 Humidity Calibrator with the preferred salt

solution prepared (for example, LiCl (11 %RH) or NaCl (75
%RH)

n Connection cable for HM70 hand-held meter (219980SP)

n Medium size cross-head screwdriver (Pozidriv)

1. Prepare the HMDW110 series transmitter for a service port connection as
instructed in section Connecting to the Service Port on page22.

2. Plug in the connection cable 219980SPto the service port of the HMDW110
series transmitter, and the other end to port Iof the MI70 indicator. If any
other probes are connected to the MI70, disconnect them.

3. Remove the filter on the probe. This exposes the sensors to damage, so
handle the transmitter carefully.

4. Unplug the Ø12 mm hole on the HMK15 salt jar and insert the probe.

5. Wait at least 15 minutes for humidity to stabilize. Stabilization may take a
much longer time if there are temperature differences or the salt solution is
freshly made.

6. Turn on the MI70 indicator.

7. Select Functions > Adjustments from the menu of the MI70 and select
Start.

8. The adjustment mode starts. Select OK.

9. Select RH as the parameter to be adjusted.

10. Theadjustment mode should now show a stable, unchanging RH value.
The difference between the measured value and the reference humidity of
the jar should be no greater than the combined measurement uncertainty of
the HMDW110 series transmitter and the salt jar. Depending on the result,
proceed as follows:

o

If the HMDW110 series transmitter is within its accuracy specification,
there is no need to proceed with the adjustment. Select Back and Exit to
leave the adjustment mode.

o

If adjustment is required, continue with the next step.

11. Select Adjust, and then select 1-point adjustment.

45

5 Maintenance

12. Select Ready, and use the arrow buttons to enter the correct RHvalue of
the salt jar. Select OKwhen done.

13. The MI70 will ask Do you really want to adjust? Select Yes. MI70 shows
the text Adjustment done and returns to the adjustment mode after a few
seconds.

14. Select Back to return to the parameter selection screen, and Exit to leave
the adjustment mode.

15. Remove the probe from the salt jar and reconnect the filter. Plug the hole on
the salt jar.

16. Turn off the MI70 indicator and disconnect the connection cable from the
service port.

17. Reconnect the terminal blocks and close the cover.

Two-Point Humidity Calibration and Adjustment
using a computer and a HMK15 Humidity
Calibrator

n Computer with

o

Windows operating system

o

Terminal application

o

Free USBport

o

Driver for Vaisala USB cable installed

n Vaisala USB cable for computer connection (219690)

n Vaisala HMK15 Humidity Calibrator with LiCl (11 %RH) and

NaCl (75 %RH) salt solutions prepared.

Other solutions may be used, but the difference between the
two points must be ≥ 30 %RH. Additionally, one solution must
be < 50 %RH,and the other must be > 50 %RH.

n Medium size cross-head screwdriver (Pozidriv)

If you have changed the HUMICAP®humidity sensor of the
transmitter, perform the procedure below so that you use the
FCRHcommand instead of the CRHcommand.

1. Prepare the HMDW110 series transmitter for a service port connection as
instructed in section Connecting to the Service Port on page22.

46

5 Maintenance

2. Plug in the connection cable 219690to the service port of the HMDW110
series transmitter, and the other end to a free USBport on your computer.

3. Remove the filter on the probe. This exposes the sensors to damage, so
handle the transmitter carefully.

4. Unplug the Ø12 mm hole on the LiCl (11 %RH) salt jar and insert the probe.

5. Wait at least 15 minutes for humidity to stabilize. Stabilization may take a
much longer time if there are temperature differences or the salt solution is
freshly made.

6. Start a terminal application on the computer and open a new terminal
session to the transmitter. For more information, see Terminal Application
Settings on page23.

7. Give the errs and send commands to check that there are no active errors,
and that the measurement is working:

errs

0000h
No errors

send

T= 23.1 'C RH= 11.5 %RH Td= -7.3 'C Tw= 9.9 'C h= 28.5
kJ/kg

8. Give the l command to view the currently active user adjustment
parameters.

Example:default values of the user adjustment parameters (no user
adjustment done).

Cp offset : 0.00000000E+00
Cp gain : 1.00000000E+00
T offset : 0.00000000E+00
T gain : 1.00000000E+00

9. Give the crhcommand to start the calibration and adjustment sequence.
The transmitter shows the measured RH value and prompts you to enter the
real humidity of the first reference point.

crh

RH : 11.5378 1. ref ?

47

5 Maintenance

10. Press enter to refresh the measured value (to see if the measurement is
now stable). When it is, enter the value of the first reference point and press
enter.

RH : 11.5378 1. ref ? <cr>
RH : 11.5379 1. ref ? <cr>
RH : 11.5379 1. ref ? 11.3
Press any key when ready ...

To exit the procedure without adjusting the measurement,
press the escape key on your keyboard.

11. Transfer the probe to the NaCl (75 %RH) salt jar. Plug the hole on the LiCl
(11 %RH) jar.

12. Wait for the humidity to stabilize. Press enter on the keyboard to refresh the
measured value:

Press any key when ready ...
RH : 74.6984 2. ref ? <cr>
RH : 74.7173 2. ref ? <cr>

13. When the measurement is stable, enter the value of the second reference
point and press enter.

RH : 74.9684 2. ref ? 75.4
OK

14. If the adjustment is successful, the transmitter responds with the text OK, and
stores the adjustment.

If the reference points do not fulfill the requirements, or the measurement is
too unstable for adjustment, the adjustment sequence will exit with an error
message. In such a case, the adjustment is not be stored.

15. Give the l command to verify that the values of the adjustment parameters
Cp offset and Cp gain have changed.

Example:user adjustment parameters after two-point humidity
adjustment. Your values will be different.

Cp offset : -2.21914053E-03
Cp gain : 1.00767076E+00
T offset : 0.00000000E+00
T gain : 1.00000000E+00

48

5 Maintenance

16. Remove the probe from the salt jar and reconnect the filter. Plug the hole on

the salt jar.

17. Disconnect the connection cable from the service port.

18. Reconnect the terminal blocks and close the cover.

Two-Point Temperature Calibration and Adjustment using a Computer

n Computer with

o

Windows operating system

o

Terminal application

o

Free USBport

o

Driver for Vaisala USB cable installed

n Vaisala USB cable for computer connection (219690)

n Two temperature references in range -40 ... +60 °C (-40 ...

+140 °F) with more than 30 °C (86 °F) difference

n Medium size cross-head screwdriver (Pozidriv)

1. Prepare the HMDW110 series transmitter for a service port connection as
instructed in section Connecting to the Service Port on page22.

2. Plug in the connection cable 219690to the service port of the HMDW110
series transmitter, and the other end to a free USBport on your computer.

3. Insert the probe in the first temperature reference.

4. Wait at least 15 minutes for temperature to stabilize.

5. Start a terminal application on the computer and open a new terminal
session to the transmitter. For more information, see Terminal Application
Settings on page23.

6. Give the errs and send commands to check that there are no active errors,
and that the measurement is working:

errs

0000h
No errors

send

T= 23.1 'C RH= 11.5 %RH Td= -7.3 'C Tw= 9.9 'C h= 28.5
kJ/kg

49

5 Maintenance

7. Give the l command to view the currently active user adjustment
parameters.

Example:default values of the user adjustment parameters (no user
adjustment done).

Cp offset : 0.00000000E+00
Cp gain : 1.00000000E+00
T offset : 0.00000000E+00
T gain : 1.00000000E+00

8. Give the ctcommand to start the calibration and adjustment sequence. The
transmitter shows the measured T value and prompts you to enter the real
temperature of the first reference point.

ct

T : 22.9424 1. ref ?

9. Press enter to refresh the measured value (to see if the measurement is
now stable). When it is, enter the value of the first reference point (in
degrees Celcius) and press enter.

T : 22.9424 1. ref ? <cr>
T : 22.9424 1. ref ? 23.0
Press any key when ready ...

To exit the procedure without adjusting the measurement,
press the escape key on your keyboard.

10. Transfer the probe to the second temperature reference.

11. Wait for the temperature to stabilize. Press enter on the keyboard to refresh
the measured value:

Press any key when ready ...
T : 54.9871 2. ref ? <cr>
T : 54.9873 2. ref ? <cr>

12. When the measurement is stable, enter the value of the second reference
point and press enter.

T : 54.9873 2. ref ? 55
OK

50

5 Maintenance

13. Give the l command to verify that new values for user adjustment

parameters T offset and T gain have been stored.

Example:user adjustment parameters after two-point temperature
adjustment. Your values will be different.

Cp offset : 0.00000000E+00
Cp gain : 1.00000000E+00
T offset : 7.64255524E-02
T gain : 1.00767076E+00

14. Remove the probe from the temperature reference.

15. Disconnect the connection cable from the service port.

16. Reconnect the terminal blocks and close the cover.

Replacing the HUMICAP®Sensor on HMD110/112
and HMW110/112

n New HUMICAP

®

humidity sensor (HUMICAP180R or

HUMICAP180VHP).

n New filter (always recommended when replacing the sensor).

n 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.

51

5 Maintenance

3. Remove the filter to access the sensors.

1 = Vaisala HUMICAP®sensor. Handle by the

plastic frame.

2 = Temperature sensor. Do not touch or

attempt to remove.
3 = Sensor socket.
4 = Transmitter probe.

4. Pull out the old HUMICAP®sensor, and insert the new one.

5. Perform a two-point humidity calibration on the serial line using the
FCRHcommand. See section Two-Point Humidity Calibration and
Adjustment using a computer and a HMK15 Humidity Calibrator on
page46.

6. Insert the new filter.

7. 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.

8. Power up the transmitter.

Replacing the HUMICAP®Sensor on HMS110/112

n New HUMICAP

HUMICAP180VHP).

n New filter (always recommended when replacing the sensor).

n Medium size crosshead screwdriver (Pozidriv).

n Flat-head screwdriver

n 3 mm hex key (Allen key) for opening the radiation shield

screws.

52

®

humidity sensor (HUMICAP180R or

5 Maintenance

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.

3. Remove the transmitter from its installation point.

4. Open the two long screws that hold the radiation shield, and pull them out.

5. Use a flat head screwdriver to push on the visible plastic tab below the
radiation shield.

6. Tilt the radiation shield away from the opened tab. This opens the second
tab on the other side, allowing you to remove the radiation shield.

7. Remove the filter to access the sensors.

1 = Vaisala HUMICAP®sensor. Handle by the

plastic frame.

2 = Temperature sensor. Do not touch or

attempt to remove.
3 = Sensor socket.
4 = Transmitter probe.

8. Pull out the old HUMICAP®sensor, and insert the new one.

9. Perform a two-point humidity calibration on the serial line using the
FCRHcommand. See section Two-Point Humidity Calibration and
Adjustment using a computer and a HMK15 Humidity Calibrator on
page46.

10. Insert the new filter.

11. Reassemble, remount, and reconnect the transmitter.

12. Power up the transmitter.

53

5 T roubleshooting

5 TROUBLESHOOTING

Error Messages

To show the currently active error messages of the transmitter, use the errs
serial command. See page 26.

Table 39 Error Messages

Error Message Possible Cause Solution

T meas error Temperature sensor is short

F meas error Humidity sensor is wet. Dry the sensor by gently

RHsensor failure Humidity sensor is damaged

T ambient error Ambient temperatur e is too

Program flash check sum
error

Parameter flash check sum
error

INFOA check sum error

SCOEFS checksum error

CURRENT check sum error

Unknown error

circuited, damaged, or
missing.

or missing.

high.

Internal transmitter error. If the error remains after a

Check that sensor legs are
not short circuited. Contact a
Vaisala Service Center if
sensor isdamaged.

blowing dry instrument air on
it.

Replace the sensor or
contact a Vaisala Service
Center.

Lower the temperature at the
installation site.

reset and restoring the
factory settings,contact a
Vaisala Service Center .

54

5 T roubleshooting

Technical Support

For technical questions, contact the Vaisala technical support by e-mail at

[e-mail]. Provide at least the following supporting information:

n Name and model of the product in question

n Serial number of the product

n Name and location of the installation site

n Name and contact information of a technically competent person who can

provide further information on the problem.

Product returns

If the product must be returned for service, see www.vaisala.com/returns.

For contact information of Vaisala Service Centers, see

www.vaisala.com/servicecenters.

55

6 T echnical Data

6 TECHNICAL DATA

Specifications

Table 40 Performance

Property Specification

Relative humidity

Measurement range 0 ... 100 %RH

Accuracy

Temperature range +10 ... +30 °C (+50 ... +86 °F)

0 ... 90 %RH

90 ... 100 %RH

Temperature range -20 ... +10 °C, +30 ... +60 °C
(-4...+50 °F, +86 ... +140 °F)

0 ... 90 %RH

90 ... 100 %RH

Temperature range -40 ... -20 °C (-40 ... -4 °F)

0 ... 100%RH

Stability in typicalHVAC applications ±0.5 %RH/year

Humidity sensor HUMICAP®180R
Temperature

Measurement range -40 ... +60 °C (-40 ... +140 °F)

Accuracyat +20 °C (+68 °F) ±0.3 °C

Temperature dependence ±0.01 °C/°C

Temperature sensor Pt1000 RTD Class F0.1 IEC60751
Calculated parameters

Measurement range for dewpoint temperature and
wet bulb temperature

Measurement range for enthalpy -40 ... 460 kJ/kg

Accuracyof the calculated parameters should be calculated at the actual condition based on
the RH and temperature specification.

Accuracyat 20°C (68°F) and 80 %RH

Dew point

Wet bulb temperatur e

Enthalpy

±2 %RH

±3 %RH

±3 %RH

±4 %RH

±4 %RH

-40 ... +60 °C (- 40 ... +140 °F)

(-10...+190BTU/lb)

±0.7 °C (1.2 °F)

±0.5 °C (0.9 °F)

±1.6kJ/kg (0.7 BTU/lb)

56

6 T echnical Data

Table 41 Operating Environment (Al l Mo dels)

Property Specification

Operating temperature range -40 ... +60 °C (- 40...+140 °F)

Operating humidity range 0 ... 100 %RH

Maximum wind/flow speed 30 m/s

Storage temperature -40 ... +60 °C (- 40...+140°F)

Electromagnetic compliance EN61326-1,

IndustrialEnvironment

Table 42 Mechanics

Property Specification

Max wire size 1.5 mm2(AWG 16)

Standard housing color White (RAL9003)

Housing material PC + 10%GF

(UL-V0approved)

Table 43 Inputs and Outputs

Property Specification

Analog output 4 ... 20 mA, looppowered

Loop resistance 0 ... 600 Ω

Supply voltage

at 0Ωload

at 600 Ω load

10 ... 28 VDC

20 ... 28 VDC

Data input for RDP100 Remote Panel Display RS485, Vaisala proprietary

protocol

57

6 T echnical Data

Dimensions

All dimensions are in millimeters (mm).

Figure 13 HMS110/112 Dimensions

Figure 14 HMD110/112 Dimensions

58

Figure 15 HMW110/112 Dimensions

Spare Parts and Accessories

6 T echnical Data

Information on spare parts, accessories, and calibration products
isavailable online at www.vaisala.com and store.vaisala.com.

Table 44 Spare Parts and Accessories

Item Order Code

Remote Panel Display RDP100

Conduit fitting + O-ring (M16x1.5 / NPT1/2 Inch) 210675SP

Conduit fitting + O-ring (M16x1.5 / PG9, RE-MS) 210674SP

Fastening set HMS110 237805

Porous PTFE Filter DRW239993SP

Membrane Filter ASM210856SP

Terminal Block, Blue 236620SP

USB cable for computer connection 219690

Connection cable for HM70 hand-held meter 219980SP

HUMICAP®180R sensor HUMICAP180R

CatalyticHUMICAP®sensor HUMICAP180VHP

59

www.vaisala.com

*M211726EN*