Rotronic HygroPalm HP22 User manual

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
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1of 16
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© 2009-2010; Rotronic AG E-M-HP22-V1_21
HygroPalm HP22 Hand-Held Indicator
User Guide

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
2of 16
Document title
© 2009-2010; Rotronic AG E-M-HP22-V1_21
Table of contents
1Overview ..................................................................................................................................................3
2General description.................................................................................................................................3
2.1 Power supply.........................................................................................................................................3
2.2 Measured parameters...........................................................................................................................3
2.3 Calculated parameters..........................................................................................................................3
2.4 Service connector..................................................................................................................................4
3User configurable settings and functions.............................................................................................4
3.1 Function overview .................................................................................................................................4
3.2 Factory default settings.........................................................................................................................5
3.3 Interaction between the HP22 and probe functions...............................................................................7
4Operation .................................................................................................................................................8
4.1 Display ..................................................................................................................................................8
4.2 Keypad..................................................................................................................................................8
4.3 Internal menu ........................................................................................................................................9
4.4 Changing the parameters shown on the display .................................................................................10
4.5 Changing the unit system....................................................................................................................10
4.6 Low battery indicator...........................................................................................................................10
4.7 Practical advice for measuring humidity..............................................................................................10
5Maintenance...........................................................................................................................................11
5.1 Replacing the battery ..........................................................................................................................11
5.2 Service cable.......................................................................................................................................11
5.3 Location of the service connector (mini USB type)..............................................................................11
5.4 Periodic calibration check of the probe................................................................................................12
5.5 Cleaning or replacing the probe dust filter...........................................................................................13
6Firmware updates..................................................................................................................................13
7Technical data .......................................................................................................................................14
7.1 Specifications......................................................................................................................................14
7.2 Dew point accuracy.............................................................................................................................15
8Accessories ...........................................................................................................................................15
9Supporting documents.........................................................................................................................15
10 Document releases................................................................................................................................16

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
3of 16
Document title
© 2009-2010; Rotronic AG E-M-HP22-V1_21
Applicability:
This manual is valid for the HP22 with firmware version 1.x, where 1.x can be 1.0, 1.1 etc. Changes to the last
digit of the version number reflect minor firmware changes that do not affect the manner in which the
instrument should be operated.
1 Overview
The HP22 is a highly accurate hand-held indicator that displays relative humidity, temperature and a
calculated parameter such as the dew or frost point. The HP22 operates with a regular 9V alkaline battery and
is available with a wide assortment of HygroClip 2 humidity-temperature probes to meet almost any
requirement. The HygroClip 2 probes feature well proven, durable sensors. Digital signal processing ensures
consistent product performance and also facilitates the task of field maintenance with features such as
potentiometer free –digital calibration.
.
Depending on the probe model, the HP22 can measure conditions within the range of 0 to 100 %RH and -100
to 200 C (-148 to 392 F). The temperature operating range of the HP22 electronics is limited to -10…60°C.
Based on the ROTRONIC AirChip 3000 digital technology the HP22 indicator and HygroClip 2 probes offer
the following user functions:
User configurable settings
Calculation of psychrometric parameters such as the dew or frost point
Humidity temperature calibration and adjustment
Simulator mode
Automatic humidity sensor test and drift compensation
Sensor failure mode
Data recording
The ability for the user to easily update both the HP22 and HygroClip 2 probe firmware means that the
indicator and probes can be kept up-to-date regarding any future functionality improvement.
2 General description
2.1 Power supply
The HP22 operates with a regular 9V alkaline battery
2.2 Measured parameters
The probes used with the HP22 measure relative humidity with a ROTRONIC Hygromer®IN1 capacitive
sensor and temperature with a Pt100 RTD.
2.3 Calculated parameters
Using the ROTRONIC HW4 software, the HP22 can be configured by the user to calculate one of the
following parameters:
oDew point (Dp) above and below freezing
oFrost point (Fp) below freezing and dew point above freezing
oWet bulb temperature (Tw)
oEnthalpy (H)
oVapor concentration (Dv)
oSpecific humidity (Q)
oMixing ratio by weight (R)
oVapor concentration at saturation (Dvs)

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
Document Type
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4of 16
Document title
© 2009-2010; Rotronic AG E-M-HP22-V1_21
oVapor partial pressure (E)
oVapor saturation pressure (Ew)
Note: some of the above parameters depend on the value of the barometric pressure. Using the ROTRONIC
HW4 software, a fixed barometric pressure value can be specified. For instructions see the following HW4
manual: E-M-HW4v2-F2-006
2.4 Service connector
The service connector is a UART digital interface (Universal Asynchronous Receiver Transmitter) with a mini-
USB type connector. This allows connecting the HP22 either to a PC running the ROTRONIC HW4 software
or to a probe input of another instrument that is compatible with the HygroClip 2 (HC2) probes. In both cases a
service cable is required. See “Maintenance” for the location of the service connector and for the type of
service cable to be used.
Connecting the HP22 to a PC is used to configure the HP22, gain access to the HP22 and probe functions
such as humidity and temperature adjustment, read data from the HP22 on the PC and update the
firmware of either the HP22 or probe.
Connecting the HP22 to another instrument is useful only when the other instrument has its own display
and keypad, and has a more powerful internal menu than the HP22 (example HP23 hand-held calibrator).
This allows showing the data measured by the HP22 on the other instrument display and also allows using
the other instrument internal menu to do for example a humidity and temperature adjustment of the HP22.
3 User configurable settings and functions
The HP22 can be used just as any conventional humidity and temperature indicator and most users will never
need to use the HP22 configurable settings and functions.
Making use of the HP22 configurable settings and functions is entirely up to the user and the appropriate
settings depend on the user application. We have provided below a short description of the HP22 functions
and also indicated the factory default settings.
3.1 Function overview
MEASUREMENT ACCURACY AND RELIABILITY (PROBE FUNCTIONS)
AirChip 3000 Functions
Description
►Humidity / temperature adjustment
o1-point or multi-point humidity calibration or adjustment
o1-point or 2-point temperature calibration or adjustment
oGenerate a time stamp for calibrations and adjustments
oRetain and view last adjustment date and adjustment values
oGenerate calibration and adjustment protocols
►Automatic humidity sensor test
and optional drift compensation
Tests the humidity sensor for drift caused by contaminants and
can be used to automatically apply a correction. The test is
automatically carried out at regular intervals of time. Can be
configured, enabled, or disabled
The humidity sensor status can be verified either with the HW4
software or with the instrument display and is shown as Good,
SQ-tuned (corrected for drift) or Bad (defective)

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
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5of 16
Document title
© 2009-2010; Rotronic AG E-M-HP22-V1_21
►Data recording
The data recording function differs from a true data logging
function in the sense that the AirChip 3000 does not time stamp
the data. The data recording function can be use to investigate
events such as a sensor malfunction as well as to retrieve data
that would otherwise be lost
oStart or stop data recording - up to 2000 value pairs (%RH
and temperature)
oStarting a recording session erases all previously recorded
data
oThe recording mode and log interval can be specified
oWhen the device is powered off, the recording session is
paused but not ended As long as the recording session
has not been ended, the device automatically resumes
recording data when powered up again
oThe recorded data can be downloaded to a PC with the
HW4 software, time stamped and viewed
MEASUREMENT LOOP VALIDATION
Functions
Description
►Simulator mode
Used to make the HP22 generate fixed values for the humidity,
temperature and calculated parameter. Can be configured,
enabled or disabled
DEVICE SAFEGUARDS
Functions
Description
►Device write protection
Used to protect the HP22 with a password to prevent
unauthorized digital access by a digital user. Can be configured,
enabled or disabled
►Internal menu access from keypad
Used to prevent accidental changes to the HP22 settings and
temperature-humidity adjustment by disabling the MENU key on
the optional keypad. Can be enabled or disabled
3.2 Factory default settings
Notes:
oConfiguration of the HP22 and probe by the user and access to its functions requires a PC with the
ROTRONIC HW4 software (version 2.1.1 or higher) installed. Service cable AC3006 is used to connect the
HP22 service connector to a USB port of the PC.
oSettings and functions that can also be either partially or fully accessed from the keypad are marked with
the letter K(see also Operation > Internal Menu).

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
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Configurable Settings
Factory default
Unit system (Metric or English)
K
Metric, except USA: English
Psychrometric calculation
Dew / frost point
Fixed pressure value
1013.25 hPa or 29.92 In Hg
Data refresh rate
1 sec.
Display resolution
1 decimal
Display backlight (optional)
K
On Key Press
Displayed parameters
K
%RH and temperature
Trend indicator (display)
Enabled
Communication protocol
RO-ASCII
RS-485 address
0
Device name
Instrument model
Functions
Factory default
Humidity / temperature adjustment
K
Device write protection
Disabled (HP22 and probe)
Menu access from keypad
Enabled
Limit humidity output to 100 %RH
Enabled (probe)
Out-of-limit value digital / display alarm
Disabled (HP22 and probe)
Data recording (probe)
K
Enabled (loop mode –10 min. interval)
Automatic humidity sensor test
Disabled (probe)
Humidity sensor drift compensation
Disabled (probe)
Monitor probe alarms
Enabled
Loss of communication with probe
Disabled
Simulator mode
Disabled (HP22 and probe)
oFor a detailed description of all AirChip 3000 / HP22 main functions see document E-T-AC3000-DF-V1
oInstructions regarding the configuration of the HP22 and probe as well as access to the functions are
provided in the following manuals:
E-M-HW4v2-F2-006
E-M-HW4v2-F2-001
E-M-HW4v2-Main (§ 6.5)
E-M-HW4v2-DR-001
E-M-HW4v2-A2-001
E-M-AC3000-CP
.
oThe factory default setting for dew / frost point calculation is frost point below freezing

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
7of 16
Document title
© 2009-2010; Rotronic AG E-M-HP22-V1_21
3.3 Interaction between the HP22 and probe functions
It is important to note that when used together, the HP22 indicator and HC2 probe (HygroClip 2) constitute a
2-component system. Each system component has its own microprocessor, firmware and functions. Some of
these functions are unique to each system component. Other functions are found in both components.
The functions and settings of the HP22 indicator and HygroClip 2 probe (HC2) operate together as indicated
below:
Function / Setting
HP22
HC2
Notes
Device protection
X
X
Individual to the HP22 and HC2 probe
RS-485 address
X
X
Individual to the HP22 and HC2 probe
Device Name
X
X
User defined description
The device name of the HC2 probe is not displayed by HW4 and is
replaced with the HP22 Input Name
Calculation
X
X
Psychrometric calculation
HP22 setting overrides HC2 probe setting
Data refresh rate
X
When set above 1 s, causes the HC2 probe not to be powered in
between measurements
Simulator function
X
X
Generates fixed humidity and / or temperature value
When enabled, the HP22 settings override the HC2 probe settings
Unit system
X
X
The HP22 setting overrides HC2 probe setting. The HC2 probe
settings still apply when the probe is used alone
Make sure to use the same humidity symbol and the same
temperature unit for both the HP22 and probe.
Out-of-limits value
alarm
X
X
The HP22 settings are independent from the HC2 probe settings.
The HC2 probe settings have an effect only when the HP22 is
enabled to monitor alarms generated by the probe
When out-of-limit values have been defined for the same
parameter for both the HP22 and probe, alarms are triggered
based on the narrowest set of limits.
Analog outputs
X
X
Parameter and scale
The HC2 probe settings have no effect on the HP22

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
Document Type
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8of 16
Document title
© 2009-2010; Rotronic AG E-M-HP22-V1_21
4 Operation
4.1 Display
The LC display of the HP22 has a backlight which
can be set to be on all the time or whenever a key is
pressed. The backlight can also be disabled.
The upper line corresponds to relative humidity or
dew / frost point and the bottom line corresponds to
temperature.
The display can be configured to show a trend
indicator on each line:
▲: increasing value
▼: decreasing value
In the event of an alarm the display shows the symbol [ ! ] to the right of the value.
For instructions see the following HW4 manual: E-M-HW4v2-F2-006.
4.2 Keypad
ON/OFF: Turns the instrument on or off
MENU: Press this key to activate the
internal menu. Press this key
again to exit the menu
UP / DOWN: When the menu is active, use these
keys to navigate the menu, make a
selection or change a value
ENTER: When the menu is active, press
this key to confirm a selection.

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
9of 16
Document title
© 2009-2010; Rotronic AG E-M-HP22-V1_21
4.3 Internal menu
Note: Unauthorized access to the menu can be prevented by disabling the “display menu” setting
(use the HW4 software > Device Manager > Display)
Main Menu
Menu Items
Selections / Information
Notes
Device Settings
Units
Metric / English
Back Light
Key Press / On / Off
Display backlight mode
Contrast
LC display contrast adjustment
Trend
On / Off
Trend indication on the display
Device Information
Version
Firmware version
Serial Nbr
Serial number
Address
RS-485 address
Type
Device type
Name
Device name
User defined
Probe Information
Version
Firmware version
Serial Nbr
Serial number
Address
RS-485 address
Name
Device name
User defined
SensorTest
Humidity sensor status
Off / Good / SQ-Tuned / Bad
Record
On / Off
Data recording by the probe
(max. 2000 values)
Humidity Adjust
RefValue
Humidity reference value
± 0.1 %RH steps
Acquired
Number of cal. points in probe
memory
<Acquire>
Save cal. point to probe memory
<Delete>
Erases all calibration points
<Adjust>
Effect depends on number of
calibration points
Temperature Adjust
RefValue
Temperature reference value
± 0.1 ˚C steps
<Adjust>
1-point adjustment only (offset)
oRecord: both the recording mode (start / stop and the log interval cannot be changed from the menu and
are as configured with the ROTRONIC HW4 software
oSensorTest: Off means that the humidity sensor has not been tested due to the configuration settings of
the test. For a description of the automatic humidity sensor test and drift compensation (SQ-tuning) see
documents E-T-AC3000-DF-V1 and E-M-HW4v2-F2-006

E-M-HP22-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP22 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
10 of 16
Document title
© 2009-2010; Rotronic AG E-M-HP22-V1_21
4.4 Changing the parameters shown on the display
When the menu is not active, press the ENTER key to change which parameters are shown on the display:
oRelative humidity and temperature
oRelative humidity, temperature and calculated parameter (when calculated parameter is enabled)
4.5 Changing the unit system
The unit system of the HP22 (metric or English) can be changed from the keypad (Menu > Settings > Unit).
Press the MENU key to show the internal menu on the display
With the menu item Settings highlighted, press the ENTER key
With the menu item Unit highlighted, press the ENTER key
Use the UP or DOWN key to change the unit system as desired
Press the MENU key twice to exit the menu and return the HP22 to normal operation
The optional HW4 software can also be used to change the unit system:
4.6 Low battery indicator
When the battery is down to about 20% of its initial charge, “Low Battery”appears at the bottom of the display.
4.7 Practical advice for measuring humidity
The most common source of error when measuring relative humidity is a difference between the
temperature of the probe and the temperature of the environment. At a humidity condition of 50 %RH, a
temperature difference of 1 C (1.8 F) typically results in an error of 3 %RH on relative humidity.
When using the HP22 hand-held indicator, it is good practice to monitor the display for temperature
stability. The probe should be given sufficient time to equilibrate with the environment to be measured. The
larger the initial temperature difference between the probe and the environment to be measured, the more
time temperature equilibration requires. This time can be shortened, and errors avoided, by using the probe
configuration that fits best for your application.
In extreme situations, condensation may occur on the sensors when the probe is colder than the
environment. As long as the humidity / temperature limits of the humidity sensor are not exceeded,
condensation does not alter the calibration of the sensor. However, the sensor has to dry out before it can
provide a valid measurement.
Non-moving air is an excellent insulator. When there is no air movement, surprising differences in temperature
and humidity can noted over short distances. Air movement at the probe generally results in measurements
that are both faster and more accurate.