ROTRONIC HP21 User Manual
E-M-HP21-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP21 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
1 of 14
Document title
HygroPalm HP21 Hand-Held Indicator
User Guide
© 2009-2010; Rotronic AG E-M-HP21-V1_21
E-M-HP21-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP21 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
2 of 14
Document title
Table of contents
1 Overview .................................................................................................................................................. 3
2 General description ................................................................................................................................. 3
2.1 Power supply ......................................................................................................................................... 3
2.2 Measured parameters ........................................................................................................................... 3
2.3 Calculated parameters .......................................................................................................................... 3
2.4 Sensor protection (dust filter) ................................................................................................................ 3
2.5 Service connector .................................................................................................................................. 4
3 User configurable settings and functions ............................................................................................. 4
3.1 Function overview ................................................................................................................................. 4
3.2 Factory default settings ......................................................................................................................... 6
4 Operation ................................................................................................................................................. 7
4.1 Display .................................................................................................................................................. 7
4.2 Keypad .................................................................................................................................................. 7
4.3 Internal menu ........................................................................................................................................ 8
4.4 Changing the parameters shown on the display ................................................................................... 8
4.5 Changing the temperature unit .............................................................................................................. 8
4.6 Low battery indicator ............................................................................................................................. 9
4.7 Practical advice for measuring humidity ................................................................................................ 9
5 Maintenance ............................................................................................................................................. 9
5.1 Service cable ......................................................................................................................................... 9
5.2 Location of the service connector (mini USB type) ................................................................................ 9
5.3 Periodic calibration check .................................................................................................................... 10
5.4 Replacing the battery .......................................................................................................................... 11
5.5 Cleaning or replacing the dust filter ..................................................................................................... 11
6 Firmware updates .................................................................................................................................. 11
7 Technical data ....................................................................................................................................... 12
7.1 Specifications ................................ ................................ ...................................................................... 12
7.2 Dew point accuracy ............................................................................................................................. 13
8 Accessories ........................................................................................................................................... 14
9 Supporting documents ......................................................................................................................... 14
10 Document releases................................................................................................................................ 14
© 2009-2010; Rotronic AG E-M-HP21-V1_21
E-M-HP21-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP21 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
3 of 14
Document title
Applicability:
This manual is valid for the HP21 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 HP21 is a highly accurate hand-held indicator that displays relative humidity, temperature and the dew or
frost point. The HP21 is perfect for spot checking HVAC installations, manufacturing and storage areas, and
generally for all ambient air measurement within the temperature range of -10 to 60°C (14 to 140 °F). The
HP21 operates with a regular 9V alkaline battery.
Based on the ROTRONIC AirChip 3000 digital technology the HP21 offers the following user functions:
User configurable settings
Calculation of 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 the AirChip 3000 firmware means that the HP21 can be kept up-todate regarding any future functionality improvement.
2 General description
2.1 Power supply
The HP21 operates with a regular 9V alkaline battery
2.2 Measured parameters
The HP21 measures 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 HP21 can be configured by the user to calculate either the dew
point or the frost point.
2.4 Sensor protection (dust filter)
The HP21 is supplied with a Polyethylene filter to protect the sensors against dust particles and high air
velocity.
© 2009-2010; Rotronic AG E-M-HP21-V1_21
E-M-HP21-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP21 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
4 of 14
Document title
MEASUREMENT ACCURACY AND RELIABILITY
AirChip 3000 Functions
Description
► Humidity / temperature adjustment
o 1-point or multi-point humidity calibration or adjustment
o 1-point or 2-point temperature calibration or adjustment
o Generate a time stamp for calibrations and adjustments
o Retain and view last adjustment date and adjustment values
o Generate 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)
2.5 Service connector
The service connector is a UART digital interface (Universal Asynchronous Receiver Transmitter) with a miniUSB type connector. This allows connecting the HP21 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 HP21 to a PC is used to configure the HP21, gain access to the HP21 functions such as
humidity and temperature adjustment, read data from the HP21 on the PC and update the AirChip 3000
firmware.
Connecting the HP21 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 HP21 (example HP23 hand-held calibrator).
This allows showing the data measured by the HP21 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 HP21.
3 User configurable settings and functions
The HP21 can be used just as any conventional humidity and temperature indicator and most users will never
need to use the HP21 configurable settings and functions.
Making use of the HP21 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 HP21 functions
and also indicated the factory default settings.
3.1 Function overview
© 2009-2010; Rotronic AG E-M-HP21-V1_21
E-M-HP21-V1_21
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroPalm HP21 hand-held indicator:
User Guide
Instruction Manual
Document Type
Page
5 of 14
Document title
► 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. This data recording function can be used to investigate
events such as a sensor malfunction as well as to retrieve data
that would otherwise be lost
o Start or stop data recording - up to 2000 value pairs (%RH
and temperature). Starting a recording session erases all
previously recorded data
o The recording mode and log interval can be specified
o When 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
o The recorded data can be downloaded to a PC with the
HW4 software, time stamped and viewed
MEASUREMENT LOOP VALIDATION
AirChip 3000 Functions
Description
► Simulator mode
Used to make the HP21 generate fixed values for the humidity,
temperature and calculated parameter. Can be configured,
enabled or disabled
DEVICE SAFEGUARDS
AirChip 3000 Functions
Description
► Device write protection
Used to protect the HP21 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 HP21 settings and
temperature-humidity adjustment by disabling the MENU key on
the keypad. Can be enabled or disabled
© 2009-2010; Rotronic AG E-M-HP21-V1_21
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