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USER'S GUIDE
Vaisala HUMICAP®Humidity and
Temperature Module
HMM213
U339EN-1.3
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PUBLISHED BY
Vaisala Oyj Phone (int.): +358 9 8949 1
P.O. Box 26 Fax: +358 9 8949 2227
FI-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2009
No part of this manual may be reproduced in any form or by any means, electronic or
mechanical (including photocopying), nor may its contents be communicated to a third
party without prior written permission of the copyright holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or Conditions of
Sale.
Page 3
________________________________________________________________________________
Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................9
About This Manual...................................................................9
Contents of This Manual.......................................................9
Version Information.............................................................10
Related Manuals.................................................................10
General Safety Considerations........................................... 10
Feedback.............................................................................11
Product Related Safety Precautions.................................... 11
ESD Protection.......................................................................11
Recycling ................................................................................12
Regulatory Compliances....................................................... 12
Patent Notice ..........................................................................13
Trademarks............................................................................. 13
Warranty..................................................................................13
CHAPTER 2
PRODUCT OVERVIEW................................................................................ 15
Introduction to HMM213 ........................................................ 15
CHAPTER 3
TO BE NOTED WHEN MEASURING HUMIDITY........................................17
CHAPTER 4
INSTALLATION............................................................................................19
Selecting Location ................................................................. 19
Electrical Connections...........................................................19
Dimensions............................................................................. 20
Serial Bus Settings.................................................................20
CHAPTER 5
SERIAL COMMANDS.................................................................................. 21
Output via the Serial Bus.......................................................21
R Starting the Measurement Output...................................21
S Stopping the Measurement Output..................................21
SEND Outputting a Reading Once .....................................22
INTV Setting the Output Interval for the RUN State ...........22
SERI Serial Bus Settings ....................................................23
ADDR Setting the Device Address .....................................23
UNIT Selecting the Output Units.........................................24
VERS Displaying Software Version .................................... 24
RESET Resetting the Transmitter....................................... 24
Operating via the Serial Bus.................................................25
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SMODE Setting the Serial Interface....................................25
OPEN & CLOSE..................................................................25
Setting the Output Format.....................................................26
MCR Setting the Carriage Return On/Off............................26
MDEC Selecting a Decimal Separator................................26
MFLD Selecting a Field Separator......................................27
MLF Setting the Line Feed On/Off ......................................27
MSPC Setting Spaces On/Off.............................................28
MSYMB Setting Variable Symbols On/Off ..........................28
MUNIT Setting Variable Units On/Off..................................29
CHAPTER 6
CALIBRATION .............................................................................................31
Humidity Calibration ..............................................................32
Humidity Calibration with Serial Commands.......................32
Two-Point Calibration.....................................................32
One Point Calibration.....................................................33
Gain Calibration..............................................................33
With the Hand-Held Humidity and Temperature Meter
HM70 or HMI41 Indicator and Calibration Cable ................34
Calibration Table ....................................................................36
Temperature Calibration........................................................36
CT Temperature Calibration of the Warmed Humidity
Sensor Head........................................................................36
Two Point Calibration.....................................................36
One Point Calibration.....................................................37
Gain Calibration..............................................................37
CT Temperature Calibration of the Additional Sensor
Head....................................................................................38
Two Point Calibration.....................................................38
One Point Calibration.....................................................39
Gain Calibration..............................................................39
CHAPTER 7
CHEMICAL PURGE OPTION.......................................................................41
CHAPTER 8
MAINTENANCE............................................................................................43
Replacing the HUMICAP®180R Sensor and the Filter.........43
Replacing Consumables........................................................43
Parts List for Consumables .................................................43
CHAPTER 9
TROUBLESHOOTING..................................................................................45
Troubleshooting Procedure ..................................................45
Technical Support ..................................................................45
Return Instructions ................................................................46
Vaisala Service Centers.........................................................47
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CHAPTER 10
TECHNICAL DATA...................................................................................... 49
Specifications......................................................................... 49
Options....................................................................................50
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List of Figures
Figure 1 Measurement Error at 100 %RH when the Temperature
Difference between the Ambient Air and the Sensor is 1 °C....18
Figure 2 Electrical Connections..............................................................19
Figure 3 Dimensions in mm (inches)......................................................20
Figure 4 Calibration Connector for the HM70 or HMI41.........................34
Figure 5 Decrease of the Sensor Gain Due to an Interfering Chemical
and the Effect of the Chemical Purge Process.........................41
Figure 6 Dewpoint Temperature.............................................................49
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List of Tables
Table 1 Manual Revisions.....................................................................10
Table 2 Related Manuals ......................................................................10
Table 3 Emission Tests......................................................................... 12
Table 4 Immunity Tests.........................................................................12
Table 5 Output Units .............................................................................24
Table 6 Greenspan's Calibration Table with Output Values According
to the Chosen Scale.................................................................36
Table 7 Available Spare Parts...............................................................43
Table 8 Relative Humidity Specifications.............................................. 49
Table 9 General Specifications .............................................................50
Table 10 Operating Voltage Specifications.............................................50
Table 11 Modules, Sensor Heads and Outputs......................................50
Table 12 Cable Lengths for Sensor Heads.............................................51
Table 13 Chemical Purge........................................................................51
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Chapter 1 ________________________________________________________ General Information
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the manual and the product.
About This Manual
This manual provides information for installing, operating, and
maintaining Vaisala HUMICAP® Humidity and Temperature Module
HMM213.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the manual
and the product.
- Chapter 2, Product Overview, introduces the features and advantages
of Vaisala HUMICAP® Humidity and Temperature Module
HMM213.
- Chapter 3, To Be Noted When Measuring Humidity, describes issues
that need to be noted in the measurement of humidity.
- Chapter 4, Installation, provides you with information that is intended
to help you install this product.
- Chapter 5, Serial Commands, contains information that is needed to
use the serial commands for this product.
- Chapter 6, Calib
this product.
- Chapter 7, Chem
chemical purge.
- Chapter 8, Maintenance, provides information that is needed in basic
maintenance of the product.
ration, contains information that is needed to calibrate
ical Purge Option, provides you with information on
- Chapter 9, Troubleshooting, describes common problems, their
probable causes and remedies, and contact information for technical
support.
- Chapter 10, Technical Data, provides the technical data of the product.
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Version Information
Table 1 Manual Revisions
Manual Code Description
U339EN-1.2 October 1999
U339EN-1.3 This manual, December 2009 - HUMICAP® sensor
type has been changed.
Related Manuals
Table 2 Related Manuals
Manual Code Manual Name
M210316EN-A Vaisala HUMICAP® Indicator HMI41 and Probes
HMP41/45/46 User's Guide
M210777EN-B Calibration of Digital Transmitters with Vaisala
HUMICAP
19164ZZ and 25917ZZ User's Guide
M210185EN-C Vaisala Humidity Calibrator HMK15 User's Guide
M210297EN-E Vaisala HUMICAP® Hand-Held Humidity and
Temperature Meter HM70 User's Guide
®
Humidity Indicator HMI41 Cables
WARNING
CAUTION
NOTE
General Safety Considerations
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 highlights important information on using the product.
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Chapter 1 ________________________________________________________ General Information
Feedback
Vaisala Customer Documentation Team welcomes your comments and
suggestions on the quality and usefulness of this publication. If you find
errors or have other suggestions for improvement, please indicate the
chapter, section, and page number. You can send comments to us by email: manuals@vaisala.com
Product Related Safety Precautions
The Vaisala HUMICAP® Humidity and Temperature Module HMM213
delivered to you has been tested for safety and approved as shipped from
the factory. Note the following precautions:
WARNING
CAUTION
CAUTION
Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.
Do not modify the unit. Improper modification can damage the product
or lead to malfunction.
Do not touch the sensor element.
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. However, it is possible to damage the product
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:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench. When this is not possible, ground yourself
to the equipment chassis before touching the boards. Ground yourself
with a wrist strap and a resistive connection cord. When neither of the
above is possible, touch a conductive part of the equipment chassis
with your other hand before touching the boards.
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- Always hold the boards by the edges and avoid touching the
component contacts.
Recycling
Recycle all applicable material.
Dispose of batteries and the unit according to statutory regulations. Do
not dispose of with regular household refuse.
Regulatory Compliances
The Vaisala HUMICAP® Humidity and Temperature Module HMM213
complies with the following performance and environmental test
standards:
The emission and immunity tests have been performed according to
standard EN61326-1.
Table 3 Emission Tests
Test Setup According to
RF field emission CISPR 22 Class B (EN55022)
Conducted emissions CISPR 22 B (EN55022)
Table 4 Immunity Tests
Test Setup According to
Electrostatic discharge IEC 1000-4-2 (EN 61000-4-2)
Fast transient burst IEC 1000-4-4 (EN 61000-4-4)
RF field immunity IEC 1000-4-3 (EN 61000-4-3)
Conducted RF immunity
NOTE: cable length max. 8 meters
Surge IEC 1000-4-5 (EN 61000-4-5)
Voltage dips, short interrupts IEC 1000-4-11 (EN 61000-4-11)
IEC 1000-4-6 (EN 61000-4-6)
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Chapter 1 ________________________________________________________ General Information
Patent Notice
The Vaisala HUMICAP® Humidity and Temperature Module HMM213
is protected by the following patents and patent applications and their
corresponding national rights:
Finnish patents 98861 and 99164, French patents 6650303 and 9504397,
German patents 69418174 and 19513274, Japanese patents 3585973 and
2801156, UK patent 0665303, and US patent 5607564.
Trademarks
Vaisala Trademark is a registered trademark of Vaisala Oyj.
Warranty
HUMICAP
Vaisala hereby represents and warrants all Products manufactured by
Vaisala and sold hereunder to be free from defects in workmanship or
material during a period of twelve (12) months from the date of delivery
save for products for which a special warranty is given. If any Product
proves however to be defective in workmanship or material within the
period herein provided Vaisala undertakes to the exclusion of any other
remedy to repair or at its own option replace the defective Product or part
thereof free of charge and otherwise on the same conditions as for the
original Product or part without extension to original warranty time.
Defective parts replaced in accordance with this clause shall be placed at
the disposal of Vaisala.
Vaisala also warrants the quality of all repair and service works
performed by its employees to products sold by it. In case the repair or
service works should appear inadequate or faulty and should this cause
malfunction or nonfunction of the product to which the service was
performed Vaisala shall at its free option either repair or have repaired or
replace the product in question. The working hours used by employees of
Vaisala for such repair or replacement shall be free of charge to the
client. This service warranty shall be valid for a period of six (6) months
from the date the service measures were completed.
®
is a registered trademark of Vaisala Oyj.
This warranty is however subject to following conditions:
a) A substantiated written claim as to any alleged defects shall have
been received by Vaisala within thirty (30) days after the defect or
fault became known or occurred, and
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b) the allegedly defective Product or part shall, should Vaisala so
require, be sent to the works of Vaisala or to such other place as
Vaisala may indicate in writing, freight and insurance prepaid and
properly packed and labelled, unless Vaisala agrees to inspect and
repair the Product or replace it on site.
This warranty does not however apply when the defect has been caused
through
a) normal wear and tear or accident;
b) misuse or other unsuitable or unauthorized use of the Product or
negligence or error in storing, maintaining or in handling the
Product or any equipment thereof;
c) wrong installation or assembly or failure to service the Product or
otherwise follow Vaisala's service instructions including any
repairs or installation or assembly or service made by unauthorized
personnel not approved by Vaisala or replacements with parts not
manufactured or supplied by Vaisala;
d) modifications or changes of the Product as well as any adding to it
without Vaisala's prior authorization;
e) other factors depending on the Customer or a third party.
Notwithstanding the aforesaid Vaisala's liability under this clause shall
not apply to any defects arising out of materials, designs or instructions
provided by the Customer.
This warranty is expressly in lieu of and excludes all other conditions,
warranties and liabilities, express or implied, whether under law, statute
or otherwise, including without limitation ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR A
PARTICULAR PURPOSE and all other obligations and liabilities of
Vaisala or its representatives with respect to any defect or deficiency
applicable to or resulting directly or indirectly from the Products supplied
hereunder, which obligations and liabilities are hereby expressly
cancelled and waived. Vaisala's liability shall under no cir-cumstances
exceed the invoice price of any Product for which a warranty claim is
made, nor shall Vaisala in any circumstances be liable for lost profits or
other consequential loss whether direct or indirect or for special damages.
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Chapter 2 __________________________________________________________ Product Overview
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features and advantages of Vaisala
HUMICAP® Humidity and Temperature Module HMM213.
Introduction to HMM213
The HMM213 modules are designed especially for relative humidity
measurements in environmental chamber applications with high
temperature and humidity levels. They also measure temperature and
calculate the dewpoint temperature.
The HMM213 has actually three different module options to choose
from:
- Humidity and temperature module: with a standard humidity and
temperature sensor head
- Dewpoint module with a warmed sensor head incorporating a
composite RH and T sensor
- Humidity and temperature module with two sensor heads: with a
warmed humidity sensor head incorporating a composite sensor, and
an additional temperature sensor head for ambient temperature
measurement
The HMM213 is a RS232 serial output module. The customer has two
options for the humidity probe length. Furthermore, the module can also
be ordered with a suitable cable length (0.65 m, 1.50 m, or 3.0 m). The
temperature measurement range is -70 ... +180 °C).
Output parameters depend on the module type. The output parameters for
the RH and T module are relative humidity and temperature. For the RH
and T module with two sensor heads, the parameters also include relative
humidity and temperature and for the dewpoint module, the parameter is
dewpoint temperature. The dewpoint temperature range is
-70 ... +100 °C.
The probes also have a selectable chemical purge option. Note that with a
warmed sensor head, the probe length is always 90 mm and the sensor is
protected with a sintered filter.
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The HMM213 modules are connected to process control systems with
screw terminals. These versatile modules incorporate the
HUMICAP®180R humidity sensor, which uses an operating principle
based on changes in the capacitance of a thin polymer film as it absorbs
water molecules. The HMM213 modules measure temperature with the
reliable Pt 100 sensor. If the module is ordered with chemical purge
option, it incorporates a composite sensor.
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Chapter 3 ________________________________________ To Be Noted When Measuring Humidity
CHAPTER 3
TO BE NOTED WHEN MEASURING HUMIDITY
This chapter describes issues that need to be noted in the measurement of
humidity.
In the measurement of relative humidity and especially in calibration, it
is essential that the temperature equilibrium is reached. Even a slight
difference in the temperature between the measured object and the sensor
causes an error. For example, at +20 °C (+ 68 °F) and 50 %RH, a
temperature difference of ±1 °C between the measured object and the
sensor causes an error of ±3 %RH. If relative humidity is 90 %RH, the
error is about ±5.4 %RH. A graph of the measurement error at 100 %RH
when the temperature difference between ambient air and the sensor is 1
°C is presented in Figure 1 on page 18.
The error is at its greatest when the temperature of the sensor differs from
that of the surroundings and the humidity is high. A difference of a few
degrees in temperature may cause water to condense on the sensor
surface. Efficient ventilation accelerates the evaporation of the condensed
water whereas in an unventilated space, it may take hours. The
HUMICAP
water has evaporated. Contaminated water condensing on the sensor may
shorten its life span and alter the calibration.
®
180R sensor returns to its normal functioning as soon as
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10
9
8
7
6
5
4
dRH (%RH)
3
2
1
0
-40-200 20406080100
Temperature (°C)
Figure 1 Measurement Error at 100 %RH when the
Temperature Difference between the Ambient Air and
the Sensor is 1 °C
NOTE
With a dewpoint module, the temperature equilibrium is not a problem as
the temperature of the sensor head changes continuously and the sensor
head has a fast humidity response.
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Chapter 4 _______________________________________________________________ Installation
CHAPTER 4
INSTALLATION
This chapter provides you with information that is intended to help you
install this product.
Selecting Location
Finding a suitable site for HMM213 is important for getting
representative ambient measurements
Select a place that gives a true picture of the environment or process and
is as clean as possible. Air should flow freely around the sensor head.
Install the sensor head to a sufficient distance from the duct or chamber
walls. Make sure to insert enough cable to the same space with the probe
in order to prevent heat conduction. If an additional temperature probe is
used, install it so that the warmed sensor head does not interfere with the
measurement.
Electrical Connections
The HMM213 module is connected to a process control system with
screw terminals. The wiring diagram is shown in Figure 2 below.
TX
Terminal
12-35VDC
GND
RX
+
Us
GND
RX
GND
TX
X1
Figure 2 Electrical Connections
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Dimensions
)
4
1
.
0
(
2
)
2
0
.
1
(
6
~
6
5
(
2
.
5
6
)
Figure 3 Dimensions in mm (inches)
Serial Bus Settings
The serial communication parameters set at factory are:
Parameter Value
Baud 1200
Parity None
Data bits 8
Stop bits 1
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Chapter 5 __________________________________________________________Serial Commands
CHAPTER 5
SERIAL COMMANDS
This chapter contains information that is needed to use the serial
commands for this product.
Output via the Serial Bus
R Starting the Measurement Output
R <cr>
Starts output of measurements to the peripheral devices (PC display or
printer); output interval is set with command INTV.
The output format depends on the transmitter configuration and
parameters in use. The order, however, is always the same: relative
humidity, temperature, and dewpoint. An example:
RH 43.0 %RH T 21.0 'C Tdp 8.0 'C <cr><lf>
When the transmitter sends out the readings, the serial interface does not
echo any commands; the only command that can be used is S (stop).
S Stopping the Measurement Output
S<cr>
Ends the RUN state; after this command all other commands can be used.
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SEND Outputting a Reading Once
SEND <cr> in STOP state
or
SEND aa <cr> in POLL state
aa = address of the transmitter when more than one transmitter
is connected to a serial bus (0 ... 99; set with command
ADDR)
Outputs the current measurement readings via the serial line. The output
format depends on which parameters the transmitter can output. Output
types are:
"RH 32.25 %RH T 25.74 'C ",<cr><lf>
"Td 7.93 'C",<cr><lf>
INTV Setting the Output Interval for the RUN State
INTV xxx yyy <cr>
xxx = output interval (0 ... 255)
0: no pause between outputs
yyy = unit (s, min or h)
Sets the output interval when the transmitter outputs measurement
readings to a peripheral device.
For example:
>INTV 10 MIN<cr>
Output intrv. : 10 min
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Chapter 5 __________________________________________________________Serial Commands
SERI Serial Bus Settings
SERI b p d s <cr>
b = bauds (150, 300, 600, 1200*, 2400, 4800)
p = parity (n = none*, e = even, o = odd)
d = data bits (7 or 8*)
s = stop bits (1* or 2)
* factory setting
Giving the plain command outputs the current settings:
>SERI <cr>
Communication parameters : 1200 N 8 1
>
Example of changing the serial bus settings:
>seri 1200 e 7 1
Communication parameters : 1200 E 7 1
Set terminal settings accordingly
>
ADDR Setting the Device Address
ADDR x
x = 0 ... 99
The command is used to give an address for one device. The address is
necessary for communication with a specific transmitter in POLL m ode,
when there are several modules connected to one serial bus
>ADDR 11
Address : 11
>
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UNIT Selecting the Output Units
UNIT x <cr>
x = m(etric units) or n(on-metric units)
Table 5 Output Units
Metric Units Non-Metric Units
RH %RH %RH
T
Td
For example, the command for setting the non-metric units is:
>UNIT N <cr>
Unit : non metric
>
When the command is given with no parameters, the transmitter outputs
the currently valid setting.
C F
C F
VERS Displaying Software Version
VERS
>VERS
HMM213 1.03
>
RESET Resetting the Transmitter
RESET <cr>
Resets the transmitter. All settings that have been changed stay in the
memory even after reset or power failure.
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Chapter 5 __________________________________________________________Serial Commands
Operating via the Serial Bus
SMODE Setting the Serial Interface
SMODE xxxx<cr>
xxxx = STOP, RUN or POLL
In STOP mode: measurements output only by command, all
commands can be used
In RUN mode: outputting automatically, only command S can
be used
In POLL mode: measurements output only with command
SEND. When in POLL mode, the output state is
changed as follows:
OPEN aa <cr>
SMODE xxxx<cr>
aa = address of the transmitter
xxxx = STOP, RUN or POLL
The OPEN command sets the bus temporarily in STOP MODE so that
the SMODE command can be given. For example:
>SMODE <cr> (which mode is in use at the moment)
Output mode : STOP
>SMODE STOP <cr> (setting STOP mode)
Output mode : STOP
>
OPEN & CLOSE
OPEN nn <cr>
nn = address of the transmitter (0 ... 99)
CLOSE <cr>
In STOP mode: command OPEN has no effect, CLOSE sets the
transmitter in POLL mode
In POLL mode: command OPEN sets the transmitter
temporarily in STOP mode, command CLOSE
returns the instrument to POLL mode
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When more than one transmitter is connected to the same serial bus, the
POLL mode makes it possible to communicate with the transmitters. For
example, a relative humidity calibration is performed at transmitter 2
(<bel> = ASCII 7):
>OPEN 2 <cr>
<cr><lf> 'HMM nn line opened for operator commands'
<cr><lf><bel>
>CRH <cr>
...
>CLOSE <cr>
<cr><lf><lf> 'line closed' <cr><lf>
Setting the Output Format
MCR Setting the Carriage Return On/Off
MCR x
x = ON/OFF
>MCR ON
Msg. cr : ON
>
MDEC Selecting a Decimal Separator
MDEC x
x = a character, TAB, SP, CR, LF
>MDEC .
dec. separator : .
>R
RH 60.50 %RH T 23.90 'C
RH 60.50 %RH T 23.90 'C
...
>MDEC Z
dec. separator : Z
>R
RH 60Z56 %RH T 23Z89 'C
RH 60Z56 %RH T 23Z90 'C
...
>
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Chapter 5 __________________________________________________________Serial Commands
MFLD Selecting a Field Separator
MFLD x
x = a character, TAB, SP, CR, LF
>MFLD SP
fld. separator : SP
>R
RH 60.53 %RH T 23.89 'C
RH 60.52 %RH T 23.89 'C
...
>MFLD TAB
fld. separator : TAB
>R
RH 60.58 %RH T 23.89 'C
RH 60.57 %RH T 23.89 'C
...
MLF Setting the Line Feed On/Off
MLF x
x = ON/OFF
>MLF OFF
Msg. lf : OFF
>R
>RH 60.78 %RH T 23.84 'C (repeating values)
>MLF ON
Msg. lf : ON
>R
RH 60.85 %RH T 23.86 'C
RH 60.80 %RH T 23.86 'C
...
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MSPC Setting Spaces On/Off
MSPC x
x = ON/OFF
MSPC sets on/off the outputting of a space before and after the values of
the message.
>MSPC OFF
Msg. space : OFF
>R
RH57.52%RH T73.81'F
RH57.50%RH T73.77'F
RH57.44%RH T73.76'F
>MSPC ON
Msg. space : ON
>R
RH 57.55 %RH T 73.78 'F
RH 57.55 %RH T 73.78 'F
RH 57.48 %RH T 73.82 'F
>
MSYMB Setting Variable Symbols On/Off
MSYMB x
x = ON/OFF
>MSYMB ON
Msg. symbol : ON
>R
RH 60.86 %RH T 23.87 'C
RH 60.86 %RH T 23.87 'C
...
>MSYMB OFF
Msg. symbol : OFF
>R
60.91 %RH 23.87 'C
60.84 %RH 23.87 'C
...
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Chapter 5 __________________________________________________________Serial Commands
MUNIT Setting Variable Units On/Off
MUNIT x
x = ON/OFF
>MUNIT ON
Msg. unit : ON
>R
RH 61.01 %RH T 23.85 'C
RH 60.99 %RH T 23.85 'C
...
>MUNIT OFF
Msg. unit : OFF
>R
RH 60.97 T 23.84
RH 60.98 T 23.87
...
>
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Chapter 6 _______________________________________________________________ Calibration
CHAPTER 6
CALIBRATION
This chapter contains information that is needed to calibrate this product.
Vaisala recommends a recalibration of the HMM213 module after six
months of use. After the first recalibration, the recommended calibration
interval is approximately 12 months. However, please note that these
intervals depend on the operating conditions and the required accuracy.
When calibrating humidity instruments, it is important that the probe, the
reference instrument, and the calibrator are in thermal equilib rium.
Therefore, always allow enough time for stabilization before starting the
actual calibration.
NOTE
- Calibration in the chamber: leave the calibrator (for example, the
HMK15) in the chamber overnight with the chamber door open.
- Calibration of a humidity and temperature module: allow at least one
hour for the stabilization of the calibrator (for example, HM70 handheld humidity and temperature meter with a reference probe).
- Calibration of a dewpoint module or of a humidity and temperature
module with two sensor heads: allow at least 3 hours for stabilization
if the sensor head is in such an environment that the warming function
has been active.
- Calibration of a module with chemical purge option: chemical purge is
activated when the power is connected. When calibrating a probe, turn
the power on with the sintered stainless steel filter on the probe, wait
for 10 minutes, and remove the filter. Let stabilize and perform a
calibration. NOTE: do not turn the power off during calibration.
When calibrating a module with the warmed sensor head,
deactivate first the heating by using command HEAT 0 <cr>. If the
sensor head is in such an environment that the warming function has
been active, allow at least 3 hours for stabilization. After calibration,
the heating is reactivated with command HEAT 1 <cr>.
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Humidity Calibration
A one-point calibration can be done against an accurate transfer standard
in the field and a two-point calibration using saturated salt solutions in
controlled conditions (HMK15). You can also send the instrument to
Vaisala or a Vaisala representative for recalibration.
Humidity Calibration with Serial Commands
Two-Point Calibration
CRH <cr>
With this command, the transmitters can be calibrated at two humidity
points against a reference.
An example of performing the two point calibration with the HMK15:
1. Leave the calibrator and the probe for at least 1 hour in the same
environment so that their temperatures have time to equalize.
2. Remove the sintered filter and insert the probe into the
measurement hole of the LiCl salt chamber in the humidity
calibrator.
3. Give the command CRH and the following text appears:
>CRH <cr>
RH : 12.00 Ref1 ?
4. Wait for 20 to 40 minutes. If the stabilization of the sensor to the
humidity in the calibrator needs to be monitored, the measurement
output can be repeated by <cr> at Ref1 and Ref2.
>CRH <cr>
RH : 12.00 Ref1 ? <cr>
RH : 11.70 Ref1 ? <cr>
RH : 11.50 Ref1 ? <cr>
...
5. Check the temperature and read the closest corresponding RH
value in the calibration table. Give the value and acknowledge it
with enter.
RH : 12.00 Ref1 ? 11.3 <cr>
Press any key when ready ...
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Chapter 6 _______________________________________________________________ Calibration
6. Insert the probe into the measurement hole of the NaCl chamber.
Wait for 20 to 40 minutes.
7. Check the temperature and read the closest corresponding RH
value in the calibration table. Give the value and acknowledge it
with enter.
RH : 76.00 Ref2 ? 75.5 <cr>
>
8. Check again the reading at the first point and repeat the procedure
if necessary.
One Point Calibration
CRH xx.xx yy.yy
xx.xx = current humidity
yy.yy = offset calibration
Example of performing the offset calibration in one reference point:
>crh 54.63 2.3
>
Use an accurate and calibrated reference only.
Gain Calibration
CRH 0 0 xx.xx yy.yy
xx.xx = current humidity
yy.yy = correction (RH
ref
-RH
measured
Example of performing the gain calibration in one reference point:
>crh 0 0 73.60 1.7
>
Use an accurate and calibrated reference only.
)
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With the Hand-Held Humidity and Temperature Meter HM70 or HMI41 Indicator and Calibration Cable
The HMM213 module can be calibrated with the Hand-Held Humidity
and Temperature Meter HM70 or HMI41 indicator and an appropriate
calibration cable (for HM70: 27159ZZ; for HMI41: 19164ZZ).
Connect the cable to the test connector of the HMM213 module and
insert the jumper as indicated in Figure 4 below. For detailed
instructions, see the following documents:
- Vaisala HUMICAP® Indicator HMI41 and Probes HMP41/45/46
User's Guide
- Vaisala HUMICAP® Hand-Held Humidity and Temperature Meter
HM70
- Calibration of Digital Transmitters with Vaisala HUMICAP®
Humidity Indicator HMI41 Cables 19164ZZ and 25917ZZ User's
Guide
1
Figure 4 Calibration Connector for the HM70 or HMI41
The following numbers refer to Figure 4 above:
1 = For calibration with the HM70 or HMI41, insert the jumper as
indicated here.
2 = Calibration connector for the HM70 or HMI41
2
NOTE
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The serial communication parameters are:
1200 bauds, no parity, 8 data bits, 1 stop bit
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Chapter 6 _______________________________________________________________ Calibration
NOTE
When the connection is being established, the message 'CON ERROR'
blinks on the HMI41 display for a couple of times after which
measurement readings appear. This is quite normal and requires no
action; however, if the message is not replaced by measurement readings,
it is an indication of an operation error.
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Calibration Table
Table 6 Greenspan's Calibration Table with Output Values
According to the Chosen Scale
Temperature °C
°F
LiCl %RH *) 11.3 11.3 11.3 11.3
NaCl %RH 75.6 75.5 75.3 75.1 74.9
15
59
20
68
25
77
30
86
35
95
*) If the LiCl solution is used or stored in temperatures below +18 °C (+64 °F), the equilibrium
humidity of the salt solution may change permanently.
Temperature Calibration
NOTE
The temperature channel of the HMM213 is very stable and the modules
have been calibrated at the factory. Unless there is a strong reason to
believe that the adjustments have changed, do not perform a temperature
calibration. This is a very demanding procedure and requires both
expertise and extremely accurate references. Furthermore, it is important
to allow enough time for the stabilization during calibration.
If for some reason it is necessary to perform the temperature calibration,
follow attentively the instructions given below. Use an accurate and
calibrated reference only.
CT Temperature Calibration of the Warmed Humidity Sensor Head
Two Point Calibration
CT <cr>
Using this command the transmitters can be calibrated against an
accurate reference, such as a Pt 100 simulator. A two-point calibration is
performed as follows:
>CT <cr>
T : 23.22 Ref1 ? 23.3 <cr>
Press any key when ready ...
T : 101.42 Ref2 ? 101 <cr>
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Chapter 6 _______________________________________________________________ Calibration
If the stabilization of the sensor to the temperature of the reference needs
to be monitored, the measurement output can be repeated with <cr> at
Ref1 and Ref2:
>CTA <cr>
T : 23.19 Ref1 ? <cr>
T : 23.20 Ref1 ? <cr>
.
.
.
T : 23.22 Ref1 ? 23.3 <cr>
Press any key when ready ...
T : 101.42 Ref2 ? 101 <cr>
One Point Calibration
CT xx.xx yy.yy
xx.xx = current temperature
yy.yy = offset correction
Example of performing the offset calibration in one reference
temperature:
>CT 21.2 2.3
>
Use an accurate and calibrated reference only.
Gain Calibration
CT xx 0 yy.yy zz.zz
xx = temperature in which there is no changes in offset
yy.yy = current temperature
zz.zz = correction (T
ref-Tmeasured
)
Example of performing the gain calibration in one reference point
without changing the offset at 0 °C:
>CT 0 0 101 -0.5
>
Example of performing the gain calibration in one reference point
without changing the offset at -70 °C:
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>CT -70 0 101 -0.5
>
Use an accurate and calibrated reference only.
CT Temperature Calibration of the Additional Sensor Head
Two Point Calibration
CTA <cr>
Using this command the transmitters can be calibrated against an
accurate reference, such as a Pt 100 simulator. A two-point calibration is
performed as follows:
>CTA <cr>
T : 23.19 Ref1 ? 23.3 <cr>
Press any key when ready ...
T : 101.42 Ref2 ? 101 <cr>
If the stabilization of the sensor to the temperature of the reference needs
to be monitored, the measurement output can be repeated with <cr> at
Ref1 and Ref2:
>CTA <cr>
T : 23.19 Ref1 ? <cr>
T : 23.20 Ref1 ? <cr>
.
.
.
T : 23.22 Ref1 ? 23.3 <cr>
Press any key when ready ...
T : 101.42 Ref2 ? 101 <cr>
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Chapter 6 _______________________________________________________________ Calibration
One Point Calibration
CTA xx.xx yy.yy
xx.xx = current temperature
yy.yy = offset correction
Example of performing the offset calibration in one reference
temperature:
>CTA 21.2 2.3
>
Use an accurate and calibrated reference only.
Gain Calibration
CTA xx 0 yy.yy zz.zz
xx = temperature in which there is no changes in offset
yy.yy = current temperature
zz.zz = correction (T
ref-Tmeasured
)
Example of performing the gain calibration in one reference point
without changing the offset at 0 °C:
>CTA 0 0 101 -0.5
>
Example of performing the gain calibration in one reference point
without changing the offset at -70 °C:
>CTA -70 0 101 -0.5
>
Use an accurate and calibrated reference only.
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Chapter 7 ______________________________________________________Chemical Purge Option
y
O
i
l
CHAPTER 7
CHEMICAL PURGE OPTION
This chapter provides you with information on chemical purge.
In some applications, the sensor gain may decrease gradually due to
interference caused by some chemical present in the ambient air (see
Figure 5 below). The sensor polymer absorbs the interfering chemical;
this reduces its water abs
In chemical purge, the interfering chemical is evaporated by heating the
humidity sensor to a temperature level of approximately +160 °C.
Automatic chemical purge takes place at startup.
orption ability and so decreases the sensor gain.
Calibration
values
Chemical purge
Measured values
gna
utput s
Humidit
after chemical
exposure
Figure 5 Decrease of the Sensor Gain Due to an Interfering
Chemical and the Effect of the Chemical Purge Process
The sensor with chemical purge option is a composite sensor in which
the HUMICAP® and Pt 100 temperature sensors are attached to each
other. Chemical purge option requires that the sensor is protected with a
stainless steel sintered filter (part no. HM46670).
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Chapter 8 ______________________________________________________________Maintenance
CHAPTER 8
MAINTENANCE
This chapter provides information that is needed in basic maintenance of
the product.
Replacing the HUMICAP®180R Sensor and the Filter
Remove the damaged sensor and insert a new one. Handle the sensor by
the plastic socket. Recalibrate the transmitter.
CAUTION
Do not touch the sensor element.
Replace a dirty filter to ensure a maximum lifetime and a fast response
for the sensor.
Replacing Consumables
This section describes how to replace consumables.
Parts List for Consumables
Table 7 Available Spare Parts
Spare Part Order Code
HUMICAP®180R Sensor HUMICAP180R
Stainless steel sintered filter HM46670
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Chapter 9 ___________________________________________________________ Troubleshooting
CHAPTER 9
TROUBLESHOOTING
This chapter describes common problems, their probable causes and
remedies, and contact information for technical support.
Troubleshooting Procedure
When troubleshooting the product, write a problem report consisting of
the following issues:
- What failed (what worked / did not work)?
- Where did it fail (location and environment)?
- When did it fail (date, immediately / after a while / periodically /
randomly)?
- How many failed (only one defect / other same or similar defects /
several failures in one unit)?
- What was connected to the product and to which connectors?
- Input power source type, voltage and list of other items (lighting,
heaters, motors etc.) that were connected to the same power output.
- What was done when the failure was noticed?
Technical Support
For technical questions, contact the Vaisala technical support:
E-mail helpdesk@vaisala.com
Fax +358 9 8949 2790
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Return Instructions
If the product needs repair, please follow the instructions below to speed
up the process and to avoid extra costs to you.
1. Read the section Warranty on page 13.
2. Contact a Vaisala Service Center or a local Vaisala representative.
The latest contact information and instructions are available from
www.vaisala.com. Addresses of the Service Centers are provided
in section Vaisala Service Centers on page 47.
Please have the following information on hand:
- serial number of the unit
- date and place of purchase or last calibration
- description of the fault
- circumstances in which the fault occurs/occurred
- name and contact information of a technically competent person
who can provide further information on the problem
3. Pack the faulty product in a strong box of adequate size, with
proper cushioning material to avoid damage.
4. Include the information specified in step 2 in the box with the
faulty product. Also include a detailed return address.
5. Ship the box to the address specified by your Vaisala contact.
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Chapter 9 ___________________________________________________________ Troubleshooting
Vaisala Service Centers
Vaisala Service Centers perform calibrations and adjustments as well as
repair and spare part services. See contact information below.
Vaisala Service Centers also offer accredited calibrations, maintenance
contracts, and a calibration reminder program. Do not hesitate to contact
them to get further information.
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Chapter 10 ___________________________________________________________ Technical Data
CHAPTER 10
TECHNICAL DATA
This chapter provides the technical data of the product.
Specifications
Table 8 Relative Humidity Specifications
Property Description / Value
Measurement range 0 ... 100 %RH
Accuracy (including non-linearity, hysteresis
and repeatability)
Response time (90%) at +20 °C in still air
(with sintered filter)
Typical temperature dependence of
electronics
Humidity sensor HUMICAP®180R
Temperature measurement range -70 ... +180 °C
Typical accuracy of electronics at +20 °C ±0.1 °C
Typical temperature dependence of
electronics
Temperature sensor Pt 100 RTD 1/3 IEC 751 Class B
±2 %RH (0 … 90 %RH )
±3 %RH (90 … 100 %RH )
60 s
0.02 %RH /°C
0.0025 °C/°C
Dewpoint temperature (°C)
5
4
3
2
1
Accuracy in dewpoint measurement (°C)
0
0 20406080
-40
Dewpoint difference (°C)
-20 0 20 40
60
80
100
100
Figure 6 Dewpoint Temperature
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Table 9 General Specifications
Property Description / Value
Operating temperature range
Probe
Electronics
Storage temperature range
(electronics)
Sensor protection:
Standard
Connections Screw terminals for 0.5 ... 1.5 mm2 wires
-70 … +180 °C
-5 … +55 °C
-40 … +70 °C
Stainless steel sintered filter
Table 10 Operating Voltage Specifications
Property Value
Operating voltage DC: 10 … 35 V
AC: 9 … 24 V
NOTE
Options
AC supply only possible without warming or chemical purge option.
Current consumption without warming or
chemical purge option
Voltage output:
Average power needed during warming
(option)
12 mA at 35 VDC
20 mA at 24 VAC
1 W (100 … 300 mA
modulated current)
Maximum power needed during chemical
purge (option):
1.4 W (100 … 300 mA
modulated current)
Table 11 Modules, Sensor Heads and Outputs
Module Sensor Heads Output
RH and T module One sensor head RH and T output
Dewpoint module Warmed humidity sensor
head
RH and T module with
two sensor heads
Warmed humidity sensor
head
Dewpoint output
RH and T output
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Chapter 10 ___________________________________________________________ Technical Data
Table 12 Cable Lengths for Sensor Heads
Sensor Head Cable Length
Humidity sensor head 65, 150, 300 cm
Optional T sensor head/ module with
two sensor heads
150 or 300 cm
Table 13 Chemical Purge
Module Automatic Chemical Purge at
Startup
RH and T module Yes
Dewpoint module Yes
RH and T module with two sensor
heads
Yes
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EN
*
www.vaisala.com
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