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HP23-A-REFERENCE-SET
User manual
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Rotronic HP23-A-REFERENCE-SET, HP23-A-SET, HP23-AW-A, 0105.HP23-A User manual

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E-M-HP23-V2_14
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Rotronic AG Bassersdorf, Switzerland
HygroPalm HP23-A / HP23-AW-A hand-held indicator:
User Guide
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HygroPalm HP23-A / HP23-AW-A
Hand-Held Indi cat or
User Guide
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User Guide
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Table of contents
Overview ...................................................................................................................................................... 4
1
2 General description .................................................................................................................................... 6
2.1 Configuration software ............................................................................................................................. 6
2.2 Power supply ............................................................................................................................................ 6
2.3 Probe inputs ............................................................................................................................................. 6
2.4 Measured parameters .............................................................................................................................. 7
2.5 Calculated parameters ............................................................................................................................. 7
2.6 Alarm Indication on the display ................................................................................................................ 8
2.7 Real time clock ......................................................................................................................................... 8
2.8 Service connector..................................................................................................................................... 8
3 User configurable settings and functions ................................................................................................ 8
3.1 Factory default settings ............................................................................................................................ 8
3.2 Interaction between the HP23 and HygroClip 2 probe functions .............................................................. 9
4 Basic operation ......................................................................................................................................... 11
4.1 Display ................................................................................................................................................... 11
4.1.1 Display modes ........................................................................................................................ 11
4.1.2 Difference between Probe 1 and Probe 2 (Delta Probe) ........................................................ 12
4.1.3 User defined parameter.......................................................................................................... 12
4.2 Keypad ................................................................................................................................................... 12
4.3 ON/OFF key ........................................................................................................................................... 13
4.4 HOLD function ........................................................................................................................................ 13
4.5 Internal menu ......................................................................................................................................... 13
4.6 Frequently used settings ........................................................................................................................ 18
4.6.1 Unit system ............................................................................................................................ 18
4.6.2 Date and time ......................................................................................................................... 18
4.6.3 Select the calculated parameter for a probe input .................................................................. 18
4.6.4 Select which probe and/or parameters are shown on the display .......................................... 18
4.6.5 Set input 1 or 2 for a digital or analog probe .......................................................................... 19
4.7 Practical advice for measuring humidity ................................................................................................. 19
4.8 Preparation of the product samples for AW measurement ..................................................................... 19
4.8.1 Additional guidelines .............................................................................................................. 21
5 Using the HP23 functions ........................................................................................................................ 22
5.1 Data capture ........................................................................................................................................... 22
5.1.1 Capturing data ........................................................................................................................ 22
5.1.2 Viewing the captured data ...................................................................................................... 22
5.2 Data logging ........................................................................................................................................... 23
5.2.1 Logging data .......................................................................................................................... 23
5.2.2 Viewing the recorded data ...................................................................................................... 24
5.3 Calibrator function .................................................................................................................................. 24
5.3.1 Connecting a device to the HP23 ........................................................................................... 25
5.3.2 Reading measurement data ................................................................................................... 25
5.3.3 About the HP23 calibration and adjustment procedures ........................................................ 25
5.3.4 Calibration against a reference environment .......................................................................... 26
5.3.5 Calibration against a reference HygroClip 2 probe or other device ........................................ 26
5.3.6 Adjustment of humidity and temperature ................................................................................ 27
5.4 Aw Mode (HP23-AW) ............................................................................................................................. 27
5.4.1 Enabling the Aw Mode and selecting the measurement function ........................................... 28
5.4.2 Probe usage guidelines .......................................................................................................... 29
5.4.3 Using the AwQuick function ................................................................................................... 29
5.4.4 Using the AwE function .......................................................................................................... 32
6 Water activity measurement with HW4 ................................................................................................... 35
6.1 Water activity measurement modes ....................................................................................................... 35
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6.2 Mode selection and settings ................................................................................................................... 36
6.3 Working with individual probes or with a group of probes ...................................................................... 37
6.4 Measurement procedure (AwQuick or AwE Mode) ................................................................................ 38
6.5 Water activity measurement report......................................................................................................... 40
6.6 Signing the report ................................................................................................................................... 41
7 Maintenance .............................................................................................................................................. 43
7.1 Replacing the battery ............................................................................................................................. 43
7.2 Connecting the HP23 to a PC ................................................................................................................ 43
7.3 Location of the service connector (mini USB type) ................................................................................. 43
7.4 Periodic calibration check of the HygroClip 2 probe ............................................................................... 44
7.5 Cleaning or replacing the probe dust filter .............................................................................................. 44
8 Firmware updates ..................................................................................................................................... 45
9 Technical data ........................................................................................................................................... 46
9.1 Specifications ......................................................................................................................................... 46
9.2 Dew point accuracy ................................................................................................................................ 48
10 Accessories ............................................................................................................................................... 49
11 Supporting documents............................................................................................................................. 50
12 Document releases ................................................................................................................................... 51
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Applicability:
This manual is valid for the HP23 with firmware version 2.x, where 2.x can be 2.0, 2.1 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 HP23 is a multifunction hand-held indicator with data logging capability. The HP23 can be used in many different applications such as the spot check measurement of HVAC installations and manufacturing processes, the measurement of seeds, ph arma ce uti cal powders and other materials in bulk, the measurement of paper stacks and rolls, etc. The HP23 is also a calibrator that can be used to read and adjust other instruments from ROTRONIC that are based on the AirChip 3000 technology.
Each of the two probe inputs can be configured to accept either a digital HygroClip 2 humidity-temperature probes (factory default) or an analog probe measuring any signal such as barometric pressure, air velocity, etc (user configuration). The HP23 has a real time clock to keep track of the date and time when recording data and is powered with either a standard 9 V alkaline battery or with a rechargeable battery.
The HP23 features two distinct operating modes:
► Standard Mode: in this mode the HP23 can be used as a general purpose indicator, as a data logger or
as a calibrator for verifying and adjusting other instruments from ROTRONIC. The standard mode offers the following functionality (availability of some of the functions depends on the HP23 model):
Display of Measured and Calculated Values
o Relative humidity and temperature data measured by up to two HygroClip 2 digital probes o Calculated humidity parameter such as dew / frost point or other, for up to two HygroClip 2
probes
o Difference between the values measured by two probes (the probes must be of the same type:
digital or analog)
o Up to two user defined calculations such as the difference between the temperature and the dew
point measured by a probe, the average of the temperature measured by two probes, etc.
o Any parameter measured by up to two analog probes (user defined)
Manual Data Capture
o To facilitate the spot checking of humidity and temperature conditions, the HP23 features eight
data bins (non-volatile me mor y ) each capable of retaining up to 250 humidity temperature values measured by a HygroClip 2 probe (analog probe data is not recorded). Each record is stamped for date and time. The data bins can be given a user defined name.
o Probe selecti on, bin sel ect ion, data capt ure and data viewing are done from the keypad.
Data Logging
o The HP23 can automatically record up to 10,000 humidity-temperature value pairs measured by
a single HygroClip 2 probe or up to 10,000 values measured by a single 1-channel analog probe. Each record is stamped for date and time. The calculated parameter (HygroClip 2 probe only) cannot be recorded. When recording data from two probes at the same time, the recording capacity per probe is cut in half.
o The HP23 features two data logging mode: start-stop (recording ends when the memory is full)
and loop (when the memory is full, the oldest record is dumped to make room for a new record)
o Except for the log file format, a ll log settings can be selected from the keypad. Data logging can
be started and stopped from the keypad
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o The HW4 software is required to download and view the recorded data
Calibrator function:
The HP23 can be used as a calibrator for all of the ROTRONIC HygroClip 2 devices (probe, transmitter or other) and allows to do the following:
o Display the measurement data from the device on the HP23. o 1-point humidity and/or temperature adjustment of the device connected to one of the HP23
probe inputs against the HygroClip 2 probe connected to second probe input of the HP23 (reference probe).
o 1-point or multi-point humidity adjustment as well as a 1-point or 2-point temperature adjustment:
against a known reference environment.
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► Aw Mode: this specialized mode is available only with model HP23-AW and is used for measuring the
water activity (Aw) of product samples and materials in bulk such as powders, seeds, etc. When set to operate in the water activity mode, the HP23 automatically displays humidity as Aw (1.000 a Mode offers the following options:
= 100 %RH). The Aw
w
Accelerated water activity measurement (AwQuick): permits measuring the water activity of
most products in typically 5 minutes. The measurement starts simultaneously for both probe inputs and is ended automatically.
Conventional water activity measure ment (AwE): the measurement starts simultaneously
for both probe inputs. The HP23 automatically detects full equilibrium conditions and ends the measurement at that time.
Data logging and probe adjustment are available in the water activity mode, but when using these functions humidity is shown as %RH as opposed to a
The HP23 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 HP23 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 HP23 electronics is limited to -10…60°C.
The ability for the user to easily update both the HP23 and HygroClip 2 probe firmware means that the indicator and probes can be kept up-to-date regarding any future functionality improvement.
. The other standard mode functions are not available.
w
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2 General description

2.1 Configuration software

Most of the HP23 settings can be configured directly from the keypad. However, some of the settings and access to some of the functions requires connecting the HP23 to the USB port of a PC running the HW4 software version 3.0 or higher. For instructions see the following HW4 manual: E-M-HW4v3-F2-012

2.2 Power supply

The HP23 uses either a standard 9V alkaline battery (factory default) or a 9V rechargeable Ni-MH battery (user configuration).
The rechargeable battery is charged either by connecting the service connector to a USB port or by plugging a battery charger (part number AC1212) to the service connector. The typical charge current is 17 mA.
Important: the HP23 is shipped with a regular 9V battery and is factory preset with the battery charge function turned off. If you plan on using a rechargeable battery, you should turn on the battery charge function (see Function Menu – Settings). Before using a regular battery again, be sure to turn off the battery charge function. Trying to charge a regular battery may cause the battery to burst and may damage the instrument.
With the default display refresh rate is 1 second the probes are permanently powered. To conserve battery power, the display refresh rate can be set from the HP23 keypad to one of the following: 10 sec, 1 min or 10 min. (MENU > Device Settings > DataUpdate). The autonomy of the HP23 with a fully charged battery depends on factors such as the display backlight, the number of probes, the display refresh rate, the functions being used, etc. As an indication, the typical current consumption is as follows: 6.5mA with 1 probe and 20mA with 1 probe + backlight.
WARNING: the display refresh rate setting can affect the data logging function of both the HP23 and probe

2.3 Probe inputs

The HP23 has two probe inputs. Using the HW4 software (Device Manager), each probe input can be configured to accept one of the following:
o HygroClip 2 humidi ty -temperature digital probe. Any input configured to accept a HygroClip 2 digital probe
can also be used to read and adjust an instrument or device that is based on the AirChip 3000 technology (use service cable AC2001).
o 1-channel analog probe (general):
following requirements: supply voltage: max. 5 VDC, current consumption: max. 10 mA, output signal: 0 to max. 3.3 VDC. The HP23 uses a 12-bit A/D converter to digitize the probe analog signal and can be configured to measure practically any parameter.
o Analog pressur e probe: t hi s is a special cas e of analog probe and is subject to the same compatibility
requirements. When analog pressure probe is selected, the HP23 automatically uses the signal from the probe to calculate any humidity parameter that requires barometric pressure as an input value (example: mixing ratio).
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To be compatible with the HP23 the analog probe must meet the
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1: RXD (UART- digital probe)
7: TXD (UART – digital probe)
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Pin-Out Diagram
2: GND (digital and power) 3: V+: digital pbe: 3.3 VDC nominal, analog pbe: maximum 5.0 VDC, 10 mA 4: AGND (analog ground) 5: Not used 6: 1-channel analog probe signal : + 0.0 to 3.3 VDC

2.4 Measured parameters

Depending on the configuration of the probe inputs, the HP23 can measure the following:
o HygroClip 2 probe: humidity and temperature. The HC2 probes measure relative humidity with a
ROTRONIC Hygromer
o Analog probe (general): any parameter measured by the probe. The parameter unit must be
specified with the HW4 software (Device Manager).
o Analog pressure probe: the unit used for barometric pressure is set with the HW4 software > Device
Manager > Unit System.
®
IN1 capacitive sensor and temperature with a Pt100 RTD.

2.5 Calculated parameters

When a probe input is configured to accept a HygroClip 2 digital probe, the HP23 can calculate any of the following parameters based on the humidity and temperature values measured by the probe (to select the calculated parameter, use either the keypad or the HW4 software > Device Manager):
o Dew point (Dp) above and below freezing o Frost point (Fp) below freezing and dew point above freezing o Wet bulb temperature (Tw) o Enthalpy (H) o Vapor concentr atio n (Dv ) o Specific humi dity (Q) o Mixing ratio by weight (R) o Vapor concentr atio n at satur ati on (Dv s) o Vapor partial pressure (E) o Vapor saturation pressure (Ew)
Note: calculating some of the above parameters requires barometric pressure as an input parameter. When no pressure probe is connected to the HP23, a fixed barometric pressure value can be specified using either the keypad or the ROTRONIC HW4 software.
In addition, the HP23 can display the difference between two probes or up to two user defined calc ulat ion s such as the difference between the temperature and the dew point measured by a probe, the average of the temperature measured by two probes, etc. (see Display in this manual)
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HP23 Configurable Settings
Factory default
Device write protection
Disabled
RS-485 address
0
Device name
Instrument model
Fixed barometric pressure value
K
1013.25 hPa (29.92 In Hg or 14.70 PSI)
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2.6 Alarm Indication on the display

Depending on the type of alarm, the display shows either a symbol or a text when the HP23 detects an alarm condition:
o Out-of-limits value (defined with the HW4 software for each probe input, includes measured values
and calculated parameter).
o No communication with the probe. o Display of fixed values when no probe is connected the input. Easily identified humidity and
temperature values can be specified with the HW4 software for each probe input.
o Bad RH sensor or major sensor failure (open or shorted sensor – humidity and temperature) o Low battery charge

2.7 Real time clock

The HP23 clock keeps track of the date and time and can be adjusted from the keypad. Using the HW4 software, the clock can be synchronized with the PC date and time. The clock does not automatically adjust for daylight saving time (DST).

2.8 Service connector

The service connector of the HP23 is a USB port. Any standard cable equipped with a mini-USB type connector at one end can be used to connect the HP23 to a PC running the ROTRONIC HW4 software. See “Maintenance” for the location of the servi ce conn ect or. The service conne ctor is use d for t he following:
o Configuration of the HP23 o Downloading data recorded on the HP23 o Access to the HygroClip 2 probe functions o Firmware updates

3 User configurable set ti ngs a nd f unctions

The HP23 can be used just as any conventional humidity and temperature indicator. Making use of the HP23 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 HP23 functions and also indicated the factory default settings.

3.1 Factory default settings

Notes:
o Configuration of the HP23 and probe by the user and access to its functions requires a PC with the
ROTRONIC HW4 software (version 3.0.0 or higher) installed. A standard USB cable with a mini-USB connector at one end is used to connect the HP23 service connector to a USB port of the PC.
o Settings and functions that can also be accessed from the keypad are marked with the letter K (see also
Operation > Internal Menu).
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HP23 Configurable Settings
Factory default
Display refresh rate
K
1 sec.
Battery type / Battery charge
K
Standard (non rechargeable)
Auto Power Off
K
OFF (disabled)
Date and time
K
Time zone dependent
Unit system (Metric or English)
K
Metric, except USA: English
Date and time format, date separator
K
European format (except North America)
Input configuration
HygroClip 2 digital probe
Input name
Probe 1 or Probe 2
Psychrometric calculation for t he input
K
No calculation
Display backlight
K
On Key Press
Displayed parameters / display mode
K
%RH and temperature + date and time
Display resolution
K
1 decimal
Trend indicator (display)
K
Enabled
Menu access from keypad
Enabled
Delta Probe / User Defined Parameter
K
Disabled
Humidity / temperature calibration
K
Enabled
Humidity / temperature adjustment
K
Enabled
Manual data capture
K
Enabled
Data Logging
K
Disabled
Aw Mode (water activity measurement)
K
Disabled
Device write protection
Disabled
Out-of-limit values alarm
Disabled
Monitor sensor alarms
Enabled (this function cannot be disabled)
Loss of communication with probe alarm
Disabled
Simulator mode (fixed values)
Disabled
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For a detailed description of all HygroClip 2 probe (AirChip 3000) functions see document
E-T-AC3000-DF-V1
Instructions regarding the configuration of the HP23 and probes as well as access to the functions are provided in the following manuals:
E-M-HW4v3-F2-012 E-M-HW4v3-F2-001 E-M-HW4v3-Main (§ 6.5) E-M-HW4v3-DR-001 E-M-HW4v3-A2-001 E-M-AC3000-CP

3.2 Interaction between the HP23 and HygroClip 2 probe functions

It is important to note that when used together, the HP23 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.
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Device protection
X X Individual to the HP23 and HC2 probe
RS-485 address
X X Individual to the HP23 and HC2 probe
User defined description replaced with the HP23 Input Name
Psychrometri c cal cu l at ion HP23 setting overrides HC2 probe setting
Refresh interval for the LC display. When set above 1 s, this
interval.
Generates fixed humidity and / or temperature value When enabled, the HP23 settings override the HC2 prob e se tting s
The HP23 setting overrides HC2 probe setting. The HC2 probe
temperature unit for both the HP23 and probe.
The HP23 settings are independent from the HC2 probe settings.
alarm.
The RH sensor is not tested when the refresh interval for the LC display is set above 1 sec.
Parameter and scale The HC2 probe settings have no effect on the HP23
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The functions and settings of the HP23 indicator and HygroClip 2 probe (HC2) operate together as indicated below:
Function / Setting HP23 HC2 Notes
Device Name X X
Calculation X X
Data refresh rate X
The device name of the HC2 probe is not displayed by HW4 and is
setting causes the HC2 probe not to be powered in between display refreshes so as to conserve battery power.
Note: when the HP23 is recording data, the probe is powered as required by the log interval, regardless of the display refresh
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Simulator function X X
Unit system X X
Out-of-limits value alarm
RH sensor test X
Analog outputs X
X X
settings still apply when the probe is used alone Make sure to use the same humidity symbol and the same
The HC2 probe settings have no effect on the HP23 and out-of­limits values defined at the probe level do not generate a HP23
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The humidity and temperature
Battery charge indicator
Standard:
o Date and time
3-line display:
o
Large:
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4 Basic operation

4.1 Display

4.1.1 Display modes

The LC display 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.
Using the HP23 Menu > Device Settings > Display Settings > Mode, the display mode can be changed as shown below:
o %RH o Temperature
The display can also be configured to show a trend indicator on each line:
▲: increasing value ▼: decreasing value
In the event of an alarm the symbol [ ! ] appears to the right of the value. The bottom of the display shows the date and time as well as which probe is currently selected:
from probe 1 are being recorded
o %RH o Temperature
o Calculated
parameter
No date and ti me
The battery charge is shown with a 7-bar icon. A diskette icon appears when the probe data is being logged.
Both the parameter and probe can be changed with the UP arrow key or the DOWN arrow key
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ON/OFF: Turns the instrument on or off.
MENU: Activates the internal menu. Press this
UP / DOWN:
ENTER:
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4.1.2 Difference between Probe 1 and Probe 2 (Delta Probe)

The difference between the humidity, temperature and calculated parameter of two probes connected to the HP23 (Probe 1 value minus Probe 2 value) can be shown on the display by turning on the DPbe/UCalc option (HP23 internal menu - accessed from the keypad). The Delta Probe function is similar to a third probe that can be selected from the keypad with the UP key or with the DOWN key.
Note: This function works only when two probes are connected to the HP23. Delta Probe is also not available when the HP23 has been configured with the HW4 software to calculate a user defined parameter (see below).

4.1.3 User defined parameter

Using the HW4 software, the HP23 can be enabled to calculate up to two user defined paramet ers suc h as the difference between the temperature and the dew point measured by a probe, the average of the temperature measured by two probes, etc.
The user defined parameters can be shown on the display by turning on the DPbe/UCalc option (HP23 internal menu - accessed from the keypad). For additional explanations and instructions see the following HW4 manual: E-M-HW4v3-F2-012.

4.2 Keypad

Activates / de-activates HOLD funct ion
key again to go back to the previous sub­menu or to exit the menu
o Changes the probe being displayed (including delta
probe or user defined parameter, when enabled)
o Changes the data-bin used to capture data o When the menu is active, use to navigate the menu,
make a selection or change a value
o When the menu is active, use to confirm the
selection of a menu item, effect a change of settings and confirm any change
o In the HP23 Standard Mode, use to capture the
current %RH and temperature data to one of the 8 data bins
o In the HP23 AW Mode, use to start, hold or stop
the water activity measurement function
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Submenu
Items
Selections or Information
Device Info
Version
Firmware version
Name
Device name
User defined
Battery charge status
Device Settings
Display Settings
Trend
ON / OFF
Trend indication on the display
Decimals
1 or 2
Display resolution
Contrast
LC display contrast adjustment
Back Light
Key Press/ON/OFF
Display backlight mode
Mode
Standard Large
DPbe/UCalc
ON / OFF
See 4.1.2 / 4.1.3
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4.3 ON/OFF key

The ON/OFF key is used as follows:
o To turn the instrument on: press the ON/OFF key o To turn the instrument off: press the ON/OFF key for more than 1 second o To activate the HOLD function: press the ON/OFF key briefly (less than 1 second) o To deactivate the HOLD function: press the ON/OFF key briefly (less than 1 second)

4.4 HOLD function

When the HOLD function is active, the word “HOLD” appears at the bottom of the LC display on the line where the date and time are normally displayed.
The display is frozen and shows the values that were either last measured or last calculated at the time the ON/OFF key was pressed. All functions such as data logging, data capture, probe adjustment, etc. are also frozen. Likewise, communication with the ROTRONIC HW4 software is frozen. The HP23 menu can still be used to change the display mode, but the values are not updated. The HOLD function is automatically ended whenever the instrument is turned off. The values that were displayed while the HOLD function was active are not memorized and are lost.
The HOLD function is not available when the Aw Mode is enabled. Enabling the Aw Mode automatically ends the HOLD function.
WARNING: when the HOLD function is active, functions such as data logging and probe adjustment from the keypad should not be used because both the measured and calculated values are no longer updated.

4.5 Internal menu

Note: Unauthorized access to the menu can be prevented by disabling “display menu”
(use the HW4 software > Device Manager > Display)
Main Menu Menu Items
Serial Nbr
Type
Battery
Serial number
Device type
H+T+Calc
Notes
See 4.1.1
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Submenu
Items
Selections or Information
Local Settings
Date Fmt
dd mm yyyy yyyy mm dd
Date format Separator
. or /
Date separator
Time Fmt
24h / 12 h
Time format
Unit Sys
Metric / English
Unit system
Input 1
Pbe Type
HygroClip Pressure
Probe type Calc
Calculation
HygroClip probe only
Analog probe voltage output range
Analog probe voltage output range
Analog probe measuring range
Analog probe measuring range
Input 2
See Input 1
See Input 1
Fixed barometric pressure
calculations
DataUpdate
1s/10s/1min/10 min
Display refresh interval
Enable or disable battery charge function
OFF
60 min
Date
Manual date setting
Time
Manual time setting
Probe 1
Info
Serial Nbr
Version
Firmware version
Name
User defined (HW4)
Humi Adjust
Acquired Points
Lists the cal. points
shown)
Additional Options:
Acquire Ref
Saves value measured by probe 2 as a cal. point
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Main Menu Menu Items
mm dd yyyy
Analog
U min (mV)
U max (mV)
Range Min
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Notes
Note: this section applies only when input 1 is connected to one of the following:
• HygroClip 2 probe
Pressure
BattCharge
AutoPowerOff
Range Max
ON / OFF
1 min 5 min 15 min 30 min 45 min
present in the probe memory (a max. of 10 points are
value used as an input for some psychrometric
The HP23 powers itself down after a user specified time period
o Clear all cal. points o Clear the last point
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Submenu
Items
Selections or Information
• Service
Acquire
Manual entry: environment
Saves value entered
Adjust
Adjusts the probe
Effect depends on number probe memory
Reset to
Returns the probe to the
Temp Adjust
Acquired Points
Lists the cal. points
Additional Options:
o
Acquire Ref
Saves value measured by probe 2 as a cal. point
Acquire
Manual entry: environment
Saves value entered
Adjust
Adjusts the probe
Effect depends on number probe memory
Reset to Factory
Returns the probe to the original factory adjustment
Probe 1
Probe Sel
HF5: be sure to
or probe 2
HF5: one probe only Device Info
Serial Nbr
Information read from the
Version
Firmware version
Name
User defined (HW4)
Probe Info
Serial Nbr
Information read from the
Version
Firmware version
Name
User defined (HW4)
Humi Adjust
Acquired Points
Lists the cal. points
shown)
Additional Options: Acquire Ref
Saves value measured by point
Acquire
Manual entry: environment
Saves value entered Adjust
Adjusts the probe
Effect depends on number of calibration points in
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Main Menu Menu Items
connector of a device with integral probe (HF3, HF4, etc.)
Factory
known reference
present in the probe memory (a max. of 2 points are shown)
known reference
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Notes
manually as a cal. point
of calibration points in
initial factory adjustment
o Clear all cal. points
Clear the last point
manually as a cal. point
Note: this section applies when input 1 is connected by means of cable AC2001 to the service connector of a HF5 or HF8 transmitter
Applies to selected probe connected to HF5 or HF8
select probe 1 HF8: select probe 1
present in the probe memory (a max. of 10 points are
known reference
of calibration points in
HF8: up to 2 probes
HF5 or HF8
selected probe connected to the HF5 or HF8
o Clear all cal. points o Clear the last point
probe 2 (HP23) as a cal.
manually as a cal. point
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Submenu
Items
Selections or Information
probe memory
Reset to
Returns the probe to the
Temp Adjust
Acquired Points
Lists the cal. points
Additional Options:
o
Acquire Ref
Saves value measured by point
Acquire
Manual entry: environment
Saves value entered
Adjust
Adjusts the probe
Effect depends on number probe memory
Reset to Factory
Returns the probe to the original factory adjustment
Probe 2
(HF3, HF4, etc.)
See Probe 1
Data Capture
o Displays the names of
data bin
o Shows the individual
records
Shows the minimum, values for the data bin
Clear Data
Clears the data bin
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Main Menu Menu Items
Factory
Applies to selected probe connected to HF5 or HF8
present in the probe memory (a max. of 2 points are shown)
known reference
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Notes
initial factory adjustment
o Clear all cal. points
Clear the last point
probe 2 (HP23) as a cal.
manually as a cal. point
of calibration points in
Note: this section applies only when input 2 is connected to one of the following:
• HygroClip 2 probe
• Service connector of a device with integral probe
See Probe 1
View Data
Summary
See Probe 1
Input 2 is not designed for connection to the service connector of a HF5 or HF8 transmitter
the 8 data bins
o Press on ENTER to
select the highlighted
data records
o Use the up and down
keys to navigate the
maximum and average
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Submenu
Items
Selections or Information
Data Logging
o Recording (ON / OFF)
Start Stop / Loop
Start Recording
o Recording
o Mode
Data logging by the HP23
Settings
Interval
Log interval: 5 sec to 1 h
Mode
StartStop / Loop
Start Stop: the recording
the new record
Probe 1
ON / OFF
Probe 2
ON / OFF
Aw Mode
Enable
ON / OFF
Enable = ON changes the
Mode
AwQuick / AwE
o AwQuick: accel erat e d
measurement
Dwell Time
minutes
Dwell time (AwQuick)
AwQ Temp
°C / minute
Temperature stability definition (AwQuick)
AwE Temp
°C / minute
Temperature stability definition (AwE)
AwE Humi
aw / minute
Humidity stability definition (AwE)
SaveResult
ON / OFF
When Aw measurement is
Probe 2: always to Bin 2
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Main Menu Menu Items
Stop Recording
Cannot be changed while the HP23 is recording data
o Samples o Interval
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Notes
o Nbr of records o Log Interval o Mode:
(max. 10,000 H+T records)
stops when the memory is full Loop: when the memory is full the oldest record is dumped to make room for
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display as follows: o Humidity unit changes
to a
o No calculated o Large display mode is
o AwE: conventional
ended, the result is saved in the following data bins:
Probe 1: always to Bin 1
w
parameter disabled
water activity measurement
water activity
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NOTE: use the MENU key to go back one step from any sub-menu or to exit the entire menu (this may require several key presses).
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4.6 Frequently used settings

4.6.1 Unit system

Press the MENU key and select Device Settings > Local Settings > Unit Sys. Press ENTER to activate the Unit Sys menu item, use the UP or DOWN arrow key to change the unit system. Press ENTER to confirm and press MENU to exit.
The HW4 software can also be used to change the unit system.

4.6.2 Date and time

Press the MENU key and select Device Settings > Date or Time. Press ENTER to activate either the Date or the Time menu item, use the UP or DOWN arrow key to change the Date or the Time. After each change, the cursor moves to the right. When done, press ENTER to confirm and press MENU to exit.
To change either the date or the time format, Press the MENU key and select Device Settings > Local Settings > Date Fmt or Time Fmt. Press ENTER to activate either the Date Fmt or the Time Fmt menu item, use the UP or DOWN arrow key to change the Date or the Time format. When done, press ENTER to confirm and press MENU to exit.
The HW4 software can also be used to set the clock of the HP23 to the PC date and time.

4.6.3 Select the calculated parameter for a probe input

The calculated parameter is available only when the input is set for a digital HygroClip 2 probe. Press the MENU key and select Device Settings > Input 1 or Input 2 > Calc. Press ENTER to activate the Calc sub­menu, use the UP or DOWN arrow key to select the calculated parameter. Press ENTER to confirm and press MENU to exit.

4.6.4 Select which probe and/or parameters are shown on the displa y

Press the MENU key and select Device Settings > Display Settings > Mode. Press ENTER to activate the Mode menu item, use the UP or DOWN arrow key to select the display mode. Press ENTER to confirm and press MENU to exit.
Depending on the display mode, use the UP or DOWN arrow key to change the probe and/or parameter being displayed.
NOTE: The calculated parameter (HygroClip 2 probe only) is shown only if enabled for the probe input that is selected (MENU > Input 1 or Input 2 > Calc).
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4.6.5 Set input 1 or 2 for a digital or analog probe

Press the MENU key and select Device Settings > Input 1 or Input 2 > Pbe Type. Press ENTER to activate the Pbe Type menu item, use the UP or DOWN arrow key to change the probe type. Press ENTER to confirm and press MENU to exit.
When using an analog probe, be sure to define both the voltage signal range and the measuring range of the probe. HW4 is required to define the unit of measurement of an analog probe.
The HW4 software can also be used to change the probe type for each input.

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.

4.8 Preparation of the product samples for AW measurement

The HC2-AW probe is designed for use with the WP-40S sample holder with removable depth reduction insert.
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The WP-40S sample holder can be used with two different sizes of disposable sample cups (PS-14: shallow / PS-40: deep). Use the shallow sample cups (PS-14) together with the depth reduction insert. The PS-14 cups are suitable for calibrating the probe with the Rotronic certified humidity standards or with saturated salt solutions. In general, use the shallow cups for a liquid, a paste or a powder. Use the PS-40 deep sampl e cups for products in bulk (large chunks).
The disposable sample cups serve two purposes:
(a) Provide a means storing product sample s prior to measurements so that they can come to the same
temperature as the probe.
(b) Prevent contamination across samples.
Prior to measurements, fill a number of disposable sample cup with the products to be measured. Usually, filling up to 1/3 of the cup is sufficient. To avoid soiling the probe, do not fill the cup above the fill line (see below).
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4.8.1 Additional guidelines

a) Measure water activity only in a temperature stable area. This is an essential requirement! Do not measure on a bench that is located near a heater, an AC vent or an open window. Avoid direct exposure of the probe and/or product samples to sun light (heating effect). For best accuracy, temperature should not change by more than 0.01°C / minute (0.0075 °C / minute in the case of product with a water activity > 0.80 aw)
b) Prior to measurements, place each product sample in a disposable sample cup with the cover on. Place the cups in the same general area as the probe. Allow for sufficient time for the samples to come to the temperature of the probe (usually room temperature). A frequent mistake is to measure product samples which have been kept overnight in a refrigerator without first allowing them to come to room temperature. Another mistake is to measure samples coming straight from a hot manufacturing process. To measure water activity at a temperature other than room temperature, place both the probe and the product samples in an incubator set at the desired temperature.
c) Prior to using the probe, verify the integrity and cleanliness of the sealing O-ring located under the probe d) Avoid warming up the probe, the sample holder or the product sample by touching or holding for too long in
your hand.
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5 Using the HP23 functions

5.1 Data capture

Manual data capture is available only in the HP23 standard operating mode. Data cannot be manually captured when the HP23 is in the AW mode.
Up to 250 relative humidity and temperature records can be manually captured to each of the 8 data-bins. The captured data is automatically date and time stamped. The calculated parameter cannot be captured. A descriptive name can be given to each data-bin with the HW4 software (laboratory, warehouse, etc.)
Note: a descriptive name (laboratory, warehouse, etc.) can be given to each data-bin with the HW4 software

5.1.1 Capturing data

o Use the UP or DOWN arrow key to select the probe o Select the data-bin with the UP or DOWN arrow key o Press the ENTER key to activate the Data Capture function o Data capture is confirmed on the HP23 display o Wait a few seconds or press MENU to EXIT the Data Capture function

5.1.2 Viewing the captured data

Press the MENU key and select Data Capture. Press ENTER to activate the Data Capture menu item. Use the UP or DOWN arrow key to select the data-bin to be viewed. Press ENTER to confirm and open the data-bin sub-menu. Use the UP or DOWN arrow key to select a menu item and press ENTER to confirm:
o View Data: view individual data records
o Summary: view the maximum, minimum and average values
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o Clear Data: erase the contents of the data-bin
Press MENU to exit.

5.2 Data logging

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Data logging can be started or stopped both in the HP23 standard operating mode and in the AW mode. The HP23 can log up to10,000 relative humidity and temperature value pairs provided by a single HygroClip 2
probe or up to 10,000 data values provided by a single 1-channel analog probe. Both probe input s can be logged at the same time and in that case the recording capacity per probe is cut in half. Each record is automatically date and time stamped. The calculated parameter cannot be directly recorded by the HP23 but it can be added to the humi dity and temp erat ur e data after downloading the r ecorded data to a PC with the HW4 software. See the following HW4 manual: E-M-HW4v3-F2-012

5.2.1 Logging data

The data logging settings apply to both probe inputs  Data logging starts and ends simultaneously for both probe inputs  The log data function settings cannot be changed as long as data logging is active
Configure the data logging function and s tart recording data:
o Press the MENU key and select “Data Logging”. Press ENTER to activate the Data Logging menu. o Use the UP or DOWN arrow key to select Settings. Press ENTER to confirm and open the Settings
sub-menu. Use the UP or DOWN arrow key to select a menu item and press ENTER to confirm:
o Select Interval (log interval). Press ENTER to activate the Interval menu item and use the UP or
DOWN arrow key to change the log interval. Press ENTER after each change to confirm and move the cursor to the right. When done, press ENTER to confirm and exit.
o Use the UP or DOWN arrow key to select the Mode menu item. Press ENTER to activate the Mode
menu item and use the UP or DOWN arrow key to change the logging mode:
- Start-Stop. the recording will stop when the memory is full
- Loop: when the memory is full the oldest record will be dumped to make room for the next record When done, press ENTER to confirm and exit.
o Use the UP or DOWN arrow key to select each probe to be logged. Press ENTER to activate the
Probe 1 or Probe 2 menu item and use the UP or DOWN arrow key to enable data logging. Press ENTER to confirm and exit.
o Press the MENU key and to use the UP arrow key to select Start Recording o Press the MENU key and use the UP arrow key to select Start Recording o Press the ENTER key twice to start recording data
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o The HP23 automatically exits the data logging function and a diskette symbol appears at the bottom
left of the display for each probe being recorded
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Stop recording data:
o Press the MENU key and select Data Logging. Press ENTER to activate the Data Logging menu
item.
o Use the UP or DOWN arrow key to select Stop Recording. Press ENTER twice to confirm. The
HP23 automatically exits the data logging function.

5.2.2 Viewing the recorded data

Data recorded with the HP23 data logging function can be viewed only after connecting the HP23 to a PC with the HW4 software. For instructions see the following HW4 manual: E-M-HW4v3-F2-012.

5.3 Calibrator function

The HP23 can be used to do the following:
o Read the measurement data from a probe, transmitter or other device o Perform a 1-point or multi-point calibration of the probe, transmitter or other device (humidity and / or
temperature) against a reference HygroClip 2 probe that is also connected to the HP23. The calibration points are retained in the probe, transmitter or other device memory.
o Perform a 1-point or a multi -point calibration of the probe, transmitter or other device (humidity and /
or temperature) against a known reference environment. The calibration points are retained in the probe, transmitter or other device memory .
o Adjust the probe, transmitter or other device using the temperature and / or humidity calibration
points already present in the probe, transmitter or other device memory.
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Use cable AC2001 to connect a
HP23
Use cable AC2001 to connect the
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5.3.1 Connecting a device to the HP23

The HP23 is compatible with all of the ROTRONIC HygroClip 2 devices (probe, transmitter or other). The table below explains how to connect the HP23 and the device to be read, calibrated or adjusted.
Device to be read / calibrated Connection to the HP23 Notes
device with a UART interface (e.g.
• HygroClip 2 plug-in probe
• Transmitter or other device with
an integral – non removable – probe. Examples: HF3, HF4 transmitters, etc.
• HygroClip 2 plug-in probe connected to a device such as the HF5 (except 2-wire models such as HF520) or HF8 transmitter
In principle, the probe, transmitter or other device can be connected to any of the two HP23 probe inputs. To avoid confusion, we recommend to systematically use probe input 1
The transmitter (or other device) must be connected to probe input 1 of the HP23. Do not connect the device to input 2
service connector) to the HP23 The probe, transmitter or other
device can be calibrated against a known reference environment or against a reference probe connected to the other input of the
service connector (UART interface) of the device to the HP23
The probe or probes connected to the device can be calibrated against a known reference environment or against a reference probe connected to

5.3.2 Reading measurement data

Connect the device to be read to the HP23 as explained under 5.3.1
o Press the MENU key and select the probe input to which the device is connected (Probe 1 or
Probe 2). Press ENTER to activate the Probe 1 or Probe 2 menu
o When the device is a HygroClip 2 probe connected to a HF5 or HF8 transmitter (or similar device),
select “Probe Sel” from the menu and press ENTER. Use the UP or DOWN arrow to select the probe to be read (HF5 transmitter: be sure to select probe 1)
o Press MENU two times to exit the menu o When more than one device is connected to the HP23, use the UP or DOWN arrow key to display
the measurements from probe input 1 or probe input 2
If so desired, measurement data can be either captured or logged.

5.3.3 About the HP23 calibration and adjustment procedures

The HP23 performs two distinct and separate procedures:
1) Acquisition and capture of calibration points to the memory of a probe or device
2) Adjustment of the probe or device based on the calibration points present in the probe or device memory
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When the purpose is just to calibrate the probe or device, use only procedure 1. Up to 2 temperature calibration points and up to100 humidity calibration points can be held indefinitely in the probe or device memory. No calibration point is saved within the HP23 itself. A calibration protocol can be printed with the HW4 software. Either the HW4 software or the HP23 can be used at any time to delete unwanted calibration points from the probe or device memory.
Adjustment can be carried out at any time after calibration, even several days later. Adjustment is a purely electronic process based on memorized data and the probe or device does not need to be exposed to any specific environment.
Note: Instructions for using the ROTRONIC calibration devices and humidity standards are provided in document E-M-CalBasics
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5.3.4 Calibration against a reference environment

Connect the device to be calibrated to the HP23 as explained under 5.3.1. Expose the device to a known environment and wait for full equilibrium with the environment. Whenever possible, provide some ventilation.
o Press the MENU key and select the probe input to which the device is connected (“Probe 1” or
“Probe 2”). Press ENTER to activate the Probe 1 or Probe 2 menu.
o When the device is a HygroClip 2 probe connected to a HF5 or HF8 transmitter (or similar device),
select “Probe 1” and “Probe Sel” from the menu and press ENTER. Use the UP or DOWN arrow to select the probe to be calibrated (HF5 transmitter: be sure to select probe 1)
o Use the DOWN arrow key to select either “Humi Adjust” or “Temp Adjust” (th is can be done in any
order).
o Press ENTER to confirm and open the next sub-menu. Use the DOWN arrow key to select the
“Acquire (Enter Ref)” menu item and press ENTER to confirm.
o Humi Adjust: the HP23 displays both the current humidity read by the device to be calibrated and
the reference humidity (known environment). Press ENTER to activate the reference value menu item and use the UP or DOWN arrow key to change each digit. Press ENTER to move the cursor to the right. When done, press ENTER to save the value. Use the DOWN arrow key to select <Acquire>. Press ENTER to activate the Acquire function. Press ENTER to confirm and save the calibration point to the device memory. The HP23 automatically exits the menu.
o Temp Adjust: the HP23 displays both the current temperature read by the device to be calibrated
and the reference temperature (known environment). Press ENTER to activate the reference value menu item and use the UP or DOWN arrow key to change each digit. Press ENTER to move the cursor to the right. When done, press ENTER to save the value. Use the DOWN arrow key to select <Acquire>. Press ENTER to activate the Acquire function. Press ENTER to confirm and save the calibration point to the device memory. The HP23 automatically exits the menu.
Note: the procedure can be repeated with different reference environments so as to accumulate several calibration points (temperature: maximum 2 points, humidity: maximum 100 points).

5.3.5 Calibration against a reference HygroClip 2 probe or other device

Connect the device to be calibrated to the HP23 as explained under 5.3.1. Connect the reference HygroClip 2 probe to the unused probe input of the HP23. Expose both the device and the reference probe to the same stable environment and wait for full equilibrium with the environment. Whenever possible, provide some ventilation.
o Press the MENU key and select either “Probe 1” or “Probe 2”. The reference probe is assumed to
be connected to the non-selected input. Press ENTER to activate the Probe 1 or Probe 2 menu
item.
o When the device is a HygroClip 2 probe connected to a HF5 or HF8 transmitter (or similar device),
select “Probe 1” and “Probe Sel” from the menu and press ENTER. Use the UP or DOWN arrow to select the probe to be calibrated (HF5 transmitter: be sure to select probe 1)
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o Use the DOWN arrow key to select either “Humi Adjust” or “Temp Adjust” (this can be done in any
order).
o Press ENTER to confirm and open the next sub-menu. Use the DOWN arrow key to select the
“Acquire (Ref = Probe)” menu item and press ENTER to confirm.
o Humi Adjust: the HP23 displays both the current humidity read by the device to be calibrated and
the value provided by the reference probe. Press ENTER to accept the calibration point. Press ENTER to confirm and save the calibration point to the device memory. The HP23 automatically exits the menu.
o Temp Adjust: the HP23 displays both the current temperature read by the device to be calibrated
and the value provided by the reference probe. Press ENTER to accept the calibration point. Press ENTER to confirm and save the calibration point to the device memory. The HP23 automatically exits the menu.
Note: the procedure can be repeated under different conditions so as to accumulate several calibration points (temperature: maximum 2 points, humidity: maximum 100 points).
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5.3.6 Adjustment of humidity and temperature

After saving calibration points to the memory of a probe or device, the HP23 can be used to do a humidity and temperature adjustment of up to two probes, transmitters or other devices. Humidity and temperature adjustment are two separate processes.
o Press the MENU key and select either “Probe 1” or “Probe 2”. Press ENTER to activate the Probe 1
or Probe 2 menu item.
o When the device is a HygroClip 2 probe connected to a HF5 or HF8 transmitter (or similar device),
select “Probe 1” and “Probe Sel” from the menu and press ENTER. Use the UP or DOWN arrow to select the probe to be calibrated (HF5 transmitter: be sure to select probe 1)
o Use the DOWN arrow key to select either “Temp Adjust” or “Humi Adjust” (we recommend
selecting Temp Adjust first). The following steps are the same for a temperature or a humidity adjustment.
o Press ENTER to confirm and open the next sub-menu. o Optional: with the “Acquired Points” menu item selected press ENTER and review the calibration
points present in memory. This submenu allows you to delete unwanted calibration points. Press MENU when done.
o Use the DOWN arrow key to select the “Adjust” menu item and press ENTER to confirm. o Press ENTER to activate the Adjust function. This function automatically erases the calibration points
in memory. When done adjusting, the HP23 automatically exits the menu.

5.4 Aw Mode (HP23-AW)

o This specialized mode is available only with model HP23-A W and is used for measuring the water
activity (Aw) of product samples and materials in bulk such as powders, seeds, etc.
o See technical note E-T-AW (Measuring Water Activity) for basic information on water activity and its
applications.
When set to operate in the Aw Mode, the HP23 automatically displays humidity as Aw (1.000 a and offers the following options:
• AwE measurement option: the HP23 waits for the full equilibration of the measured product and probe.
For most products, this takes from 30 to 60 minutes. The HP23 automatically detects equilibrium conditions (humidity and temperature) and ends the measurement at that time by freezing the display.
• AwQuick measurement option
measurement and provides a result in typically 5 minutes. The measurement ends automatically and the
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: the HP23 uses an algorithm to accelerate the water activity
= 100 %RH)
w
E-M-HP23-V2_14
Dwell Time
AwQuick
The HP23 waits the specified amount of time before processing the humidity
Recommended value: 3 or 4 minutes.
AWQ-Temp
AwQuick
The HP23 considers temperature to be stable when the rate of change of the
Recommended value: 0.01 °C / min
AWE-Temp
AwE
The HP23 considers temperature to be at equilibrium when the rate of
Recommended value: 0.01 °C / min
AWE-Humi
AwE
The HP23 considers humidity to be at equilibrium when the rate of change of
Recommended value: 0.0001 Aw / min
SaveResult
AwQuick
When the Aw measurement is ended, the result is saved in the following
Probe 2: Bin 2
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display is frozen. When temperature conditi ons are sta ble (b oth at the prod uct and probe), the value measured with the AwQuick mode is generally within ± 0.005 aw of the value that would be obtained by waiting for full equilibration of the product and probe
.
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5.4.1 Enabling the Aw Mode and selecting the measurement function

To set the HP23 to the water activity mode:
o Press the MENU key and select “Aw Mode”. Press ENTER to activate the Aw Mode menu. o With the “Enable” menu item highlighted, press ENTER and use the UP or DOWN arrow key to
select ON. Press ENTER to confirm the selection.
o Use the DOWN arrow key to select the “Mode” menu item and press ENTER. Use the UP or DOWN
arrow key to select either AwQuick or AWE. Press ENTER to confirm the selection.
o The settings for either the AwQuick or AWE function can be changed after using the UP or DOWN
arrow key to highlight the setting and by pressing on ENTER. Use the UP or DOWN arrow key to change each digit. Press ENTER to move the cursor to the right. When done, press ENTER to save the value.
o Press MENU twice to fully exit the menu.
Water activity mode settings:
Setting Applies to Notes
data with the AwQuick algorithm.
temperature signal is less than the specified value.
change of the temperature signal is less than the specified value.
the humidity signal is less than the specified value.
AwE
data bins: Probe 1: Bin 1
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5.4.2 Probe usage guidelines

1) HC2-AW probe: check that the red LED on top of the probe is lit. This indicates that the probe is being powered. If necessary, power the probe by pressing once on the red button located on top of the probe. When the red LED is no t lit, the HC2-AW probe is not powered and the instrument is not receiving a signal from the probe.
2) Measuring with only one probe at a time: both the AwQuick and AwE functions run simultaneously for both HP23 probe inputs. We strongly recommend to either disconnect or to power down any unused probe.
IMPORTANT: o The measurement starts simultaneously for both probe inputs (disconnect or power off any
unused probe)
o Usually, the measurement ends at a different time for each probe o Each probe can be displayed by using the UP or the DOWN key o Do not press on ENTER until the measurement has ended for both probes

5.4.3 Using the AwQuick function

The HP23 uses an algorithm to project the full equilibrium value (water activity) of the product sample:
1) The value of the humidity signal is constantly monitored
2) The stability of the temperature signal is constantly monitored
3) After an initial period of time (dwell time), the humidity data is used to project the end value of the
equilibration process (water activity). The measurement ends automatically as soon as the projected Aw value is stable. At that time, the HP23 freezes the display.
The measurement is automatically ended and typically requires about 5 to 6 minutes. With the default dwell time of 4 minutes, the difference between the AwQuick function and the conventional
measurement method is typically 0.005 aw or less. The value of the dwell time can be set by the user (see SETTINGS) and is a tradeoff between speed of measurement and accuracy. Generally, a longer dwell time produces more accurate results but causes measurements to take longer.
The value of temperature shown at the end of the measurement is the average temperature during the measurement. The HP23 displays a trend indicator to the left of the temperature value. This is used to verify that temperature was stable during the measurement.
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Current
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Probe 1
Elapsed time
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1. AWQ Reset: the HP23 is ready to start measuring all connected probes
When ready to measure, press on the ENTER key.
2. AWQ Dwell: the measurement is in the “dwell” phase
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in the dwell phase
humidity value
temperature value
hh:mm:ss
is being displayed
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Measurement ended
Average
Current
Final
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3. AWQ Running: at the end of the “dwell” phase the HP23 starts projecting the end result
4. AWQ Ended: when the projection is stable for a probe being displayed, the HP23 automatically ends the
measurement and freezes the display for that probe. A check mark appears to the left of the water activity value. In addition the HP23 can be set with the HW4 software to emit an acoustic signal (Beep) lasting 5 seconds. The acoustic signal can be stopped by pushing a key (do not press the ENTER key).
When two probes are connected to the HP23, use the UP or DOWN key to verify the status of each probe. IMPORTANT: do not press the ENTER key until the measurement is ended for both probes.
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Aw projection
temperature
Aw projection
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5. AWQ Reset: write down the measurement for each probe or use the automatic data capture function. This
function can be enabled from the keypad: MENU > Aw Mode > SaveResult > ON. The Aw value measured by probe 1 is saved to Data Bin 1. Probe 2 is saved to Data Bin 2 (see 5.1 Data Capture).
Press ENTER. The HP23 is ready to start a new measurement
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5.4.4 Using the AwE function

The HP23 monitors the water activity and temperature values measured by the probe. When both values are at equilibrium during a few minutes, the measurement is automatically ended. Depending both on the product being measured and on the stability of temperature, measurements typically require 30 to 60 minutes.
1. AWE Reset: the HP23 is ready to start a measurement using one or two probes
When ready to measure, press on the ENTER key.
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Current
Current
AwE mode is running
Probe 1
Elapsed time
Measurement ended
Final
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2. AWE Running: the HP23 starts monitoring the humidity and temperature signals for equilibrium
3. AWE Ended: when both the humidity and temperature signals measured by a probe are stable, the HP23
automatically ends the measurement and freezes the display for that probe. A check mark appears to the left of the water activity value. In addition the HP23 can be set with the HW4 software to emit an acoustic signal (Beep) every 5 seconds. The acoustic signal can be stopped by pushing a key (do not press the ENTER key).
When two probes are connected to the HP23, use the UP or DOWN key to verify the status of each probe. IMPORTANT: do not press the ENTER key until the measurement is ended for both probes.
Page
humidity value
temperature value
hh:mm:ss
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Aw measurement
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4. AWE Reset: write down the measurement for each probe or use the automatic data capture function. This
function can be enabled from the keypad: MENU > Aw Mode > SaveResult > ON. The Aw value measured by probe 1 is saved to Data Bin 1. Probe 2 is saved to Data Bin 2 (see 5.1 Data Capture).
Press ENTER. The HP23 is ready to start a new measurement
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6 Water activity measurement with HW4

6.1 Water activity measurement modes

The AwE / AwQuick tab is available only with HW4 Professional with AwQuick. HW4 features two modes for measuring water activity and the name of the tab depends on which mode has been selected.
● AwE mode
In this mode HW4 monitors the stability of both temperature and humidity. The measurement is automatically ended as soon as both humidity and temperature reach equilibrium. The natural (or static) equilibration of most products typically requires from 45 to 60 minutes and can take as long as a couple of hours.
● AwQuick mode:
In the AwQuick mode, HW4 uses an algorithm to project the full equilibrium value (water activity) of the measured product. The measurement is automatically ended and typically requires about 5 minutes.
HW4 performs the following tasks:
1) The value of the humidity signal is constantly monitored
2) The stability of the temperature signal is constantly monitored
3) After an initial period of time (dwell time), HW4 uses the humidity data to project the end value of the equilibration process (water activity). The measurement ends automatically as soon as the projected Aw value is stable.
With the dwell time set to 4 minutes, measurements typically require about 5 minutes. When temperature conditions are stable (both at the product and probe), the measurement obtained with the AwQuick mode is generally within ± 0.005 aw of the measurement that would be obtained by waiting for full equilibration (AwE mode).
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er Settings and Tools select HW4 Global Settings and select the AwQuick
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6.2 Mode selection and settings

To select the mode and to enter or modify the settings to be used in each mode, select Settings and Tools in the HW4 main menu bar. Und Mode / AwE Mode tab (the name of this tab changes depending on the mode that is currently selected).
Note: the values shown above are the most frequently used. IMPORTANT: Both the selected mode and its settings apply globally to all instruments and probes.
To select the mode and to enter or modify the settings to be used in each mode, click on the Settings button located on the AwE / AwQuick tab.
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6.3 Working with individual probes or with a group of probes

Working with individual probes
Probes just discovered by HW4 (HW4 Main Menu Bar > Devices and Groups > Search for Master Devices > USB Masters) are shown individually in the Device Tree.
At any time only one probe can be selected in the Device Tree. After selecting a probe, the user can start measuring water activity with that probe.
HW4 can run several water activity measurements concurrently. Select any probe and start measuring water activity with that probe. Select another probe and start measuring water activity with that other probe. The water activity measurement process (AwQuick or AwE mode) runs independently for each probe. When measuring water activity with several individual probes simultaneously, it is incumbent to the user to change from time to time the probe selected in the Device Tree so as to find out when the measurement is ended.
Note: the bottom of the form has 3 text fields labeled “Batch Number”, “Product Name” and “Comments”. The contents of these fields will appear on the water activity measurement report, assuming that the user decides to generate such a report. To customize the contents of these fields for each probe, wait until one of the probes is done and enter a text in each field just before clicking on the “Generate report” button. Select another probe and proceed in the same manner.
Working with a group of probes
Probes that have been discovered by HW4 can be put into a group created by the user as illustrated below :
Working with a group of probes offers the convenience of monitoring all probes at the same time. However, the contents text fields labeled “Batch Number”, “Product Name” and “Comments” are shared by all probes within the group and cannot be customized for each individual probe.
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6.4 Measurement procedure (AwQuick or AwE Mode)

1) Select an individual probe or a group of probes in the Device Tree (left pane of the HW4 main screen)
2) In the right pane of the HW4 main screen, select the AwE / AwQuick tab (the label of this tab changes depending on which mode is currently selected in the HW4 Global Settings). Note that the right pane is slightly different depending on whether an individual probe or a group of probe has been selected in the Device Tree.
3) Select the probe or probes to be used for the measurement by clicking on the box located to the left of the probe (a check mark appears when the probe is selected).
4) To start the measurement, click on the Start button located at the bottom of the form.
A small blue symbol appears to the left of the probe to indicate that the measurement is in progress. After a while trend indicators also appear next to the water activity and temperature readings.
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5) When HW4 detects equilibrium condition, the measurement ends automatically and the symbol to the left of the probe changes to green. The result appears in the “Water Activity” column.
6) Optional: at this time you may want to enter a Batch Number, a Product Name and Comments in the fields located at the bottom of the form. This information will appear in the water activity measurement report should you choose to generate such a report.
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7) Optional: click on the button labeled “Generate report” to generate a water activity report.
8) The process is ended by clicking on the Stop button located at the bottom of the form. At this time a new measurement can be started.
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6.5 Water activity measurement report

NOTE: Generate and save Protocols” must be enabled in HW4 Global Settings > Events tab
Prior to clicking on the Stop button, click on the “Generate report” button to generate a measurement report. HW4 opens a dialog box that allows the user to specify a file name and a location. The report is saved as a text file (extension txt).
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Use the report menu bar to sign and / or print the report.
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6.6 Signing the report

Select “Sign document” from the file menu to add your HW4 user name and a comment text to the report. For authentication purposes you will need to enter your password.
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A new section is inserted at the bottom of the report:
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7 Maintenance

7.1 Replacing the battery

To replace the battery, turn the latching button counter-clockwise and pull out the battery holder.

7.2 Connecting the HP23 to a PC

Any USB cable (mini-USB con nect or at one end) can be used to connect the HP23 to a USB port of a PC running the ROTRONIC HW4 software. Prior to connecting the HP23, the ROTRONIC USB driver must be installed on the PC. Both the driver and the installation instructions (document E-M-HW4v3-Main) are located on the HW4 CD.

7.3 Location of the service connector (mini USB type)

The service connector is a USB port and can be accessed without opening the enclosure after removing the protective red round cover.
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7.4 Periodic calibration check of the HygroClip 2 probe

Both the Pt 100 RTD temperature sensor used in the probe and associated electronics are very stable and should not require any calibration after the initial factory adjustment. Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1 %RH per year. For maximum accuracy, calibration of the probe should be verified every 6 to 12 months. Applications where the probe is exposed to significant pollution may require more frequent verificatio ns.
The procedures for using the HP23 to calibrate and adjust a probe, a transmitter or any other device are described in the Calibrator Function chapter of this manual.

7.5 Cleaning or replacing the probe dust filter

See document E-M-HC2 Probes-V1
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8 Firmware updates

Firmware updates will be available on the ROTRONIC website for downloadi ng. Fir mw are f iles are given a name that shows both to which device the file applies and the version number of the firmware. All firmware files have the extension HEX. Procedure for updating the firmware:
o Use a USB cable to connect the service connector of the HP23 to a USB port of a PC with the
ROTRONIC HW4 software installed. Note that the ROTRONIC USB driver must be installed on the PC as explained in the HW4 manual E-M-HW4v3-Main.
o Copy the firmware update file from the ROTRONIC website to the PC. o Start HW4 software on the PC and search for the HP23 (HW4 Main Menu Bar > Devices and Groups
> Search for USB Masters).
o After finding the HP23, expand the device tree to its functions. Select Device Manager. In the Device
Manager menu bar select Tools > Firmware Update. For instructions see document E-M-HW4v3-F2-012
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E-M-HP23-V2_14
General
HP23
Humidity-temperature hand-held indicator with 2 configurable probe time)
Battery type
9 V alkaline (standard) or Ni-MH 8.4V, 170…250mAh (rechargeable)
Low battery indication
Yes (7-s egment icon)
Yes (rechargeable battery only) via service connector (use PC USB port or AC adapter)
Operating modes
HP23
Display of %RH, temperature + calculated parameter Display of analog probe measurement
Display of water activity and temperature
o AwQuick : accelerated measurement
Probe input options
HP23
Digital probe
HygroClip 2 probe
Supply voltage to probe: 5 VDC Configurable measuring range and measurement unit
Humidity and temperature measurement
See document E-M-HC2 Probes > Specifications
Calculated parameters
HP23
Dew point (Dp) above and below freezing
Vapor saturation pressure (Ew)
Start-up time and data refresh rate
HP23
Start-up time
3 s (typical)
Data refresh rate
1 s (typical)
Functions
HP23
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9 Technical data

9.1 Specifications

Device type
Battery charge
Standard mode
AW mode
inputs (HygroClip 2 or analog probe) and real time clock (date and
o AwE : conventional measurement
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Analog probe (12-bit AD conver ter)
Psychrometric calculations
Maximum probe signal range: 0 to 3.3 VC
HygroClip 2 probe
Frost point (Fp) below freezing and dew point above freezing Wet bulb temperature (Tw) Enthalpy (H) Vapor concentration (Dv) Specifi c humidity ( Q) Mixing ratio by weight (R) Vapor concentration at saturation (Dv s) Vapor partial pressure (E)
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Functions
HP23
o %RH, temperature and calculated parameter difference (probe 1
two user defined parameters
o Manual data capture of %RH and temperature + date and time
o Up to 250 records per data bin
o Configurable log interval (from 5 sec to 1 hour)
being simultaneously recorded
o Can be used to calibrate and adjust HygroClip probes,
o Calibration against reference probe or reference environment
o Conventional water activity measurement
Simultaneous measurement of two probes (HygroClip 2 only)
Service connector
HP23
Interface type
USB
Maximum service cable length
5 m (16.4 ft)
General specifications
HP23
LC, 1 or 2 decimals resolution, backlight, trend, alarm, data logging and low battery indication
%RH and temperature + date and time
Water activity and temperature
Housing material
ABS
Housing protection grade
IP 40
Overall dimensions
270 x 70 x 30 mm (10.63 x 2.76 x 1.17”)
Weight
About 198 g (7.0 oz)
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Delta Probe or User defined parameter
Data capture
Data logging
less probe 2). This is available only when the calculation of a user defined parameter is not enabled.
o Using the HW4 software, the HP23 can be set to calculate up to
stamp (HygroClip 2 probe only)
o 8 separate data bins (each can be given a specific name with
the HW4 software)
o Start-Stop or Loop mode o Up to 10,000 RH+T records for a single HygroClip 2 probe o Up to 10,000 records for a single 1-channel analog probe o Each data record is given a date and time stamp o Recording capacity per probe is cut in half when two probes are
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Calibrator
Water activity measurement
Display
Display modes
transmitters and other devices based on the AirChip 3000 technology
o Fully fledged calibration and adjustment function
o Accelerated water activity measurement o Automatic end of measurement
%RH, temperature and calculated parameter %RH or temperature or calculated parameter + date and time
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Conformance to standards
HP23
EMC Directive 2004/108/EG: EN 61000-6-3: 2005, EN 61000-6-4: 2001 + A11
Solder type
Lead free (RoHS directive)
FDA / GAMP directives
Compatible
Environmental limits
HP23
Storage and transit
-20…+70 °C / 0…100 %RH, non condensing
-10….60 °C (limited by LC display) 0…100 %RH, non condensing
Temperature limits at probe
Depends on probe model
100 %RH up to 80 °C (176 °F)
15 %RH at 150 °C (302 °F)
Maximum air velocity at probe
20 m/s (3,935 ft /min)
Critical environments
Humidity sensor: as per DV04-14.0803.02 - Critical chemicals
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CE / EMC immunity
Operating limits at electronics
Maximum humidity at probe
EN 61000-6-1: 2001, EN 61000-6-2: 2005
75 %RH at 100 °C (212 °F) 45 %RH at 125 °C (260 °F)
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9.2 Dew point accuracy

See document E-M-HC2 Probes > Dew point accuracy
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E-M-HP23-V2_14
Document code Unit
Rotronic AG Bassersdorf, Switzerland
HygroPalm HP23-A / HP23-AW-A hand-held indicator:
User Guide
Document title
Page
Instruction Manual
49 of 51

10 Accessories

For accessories and parts such as the HW4 configuration software, service cables, calibration accessories and spare dust filters, please see document E-M-HC2-accessories
© 2009-2014; Rotronic AG E-M-HP23-V2_14
Find Quality Products Online at: sales@GlobalTestSupply.com
www.GlobalTestSupply.com
E-M-HP23-V2_14
Document File Name
Contents
HW4 software version 3: General instructions and functions common to all devices
HW4 software version 3: HP23 hand-held indicator and probes Device Manager and Data Recording functions
Temperature and humidity calibration basics Instructions for using the ROTRONIC humidity standards
Document code Unit
Rotronic AG Bassersdorf, Switzerland
HygroPalm HP23-A / HP23-AW-A hand-held indicator:
User Guide
Document title

11 Supporti ng doc um ent s

E-M-HC2 Probes-V1
E-M-HC2-accessories
E-T-AC3000-DF-V1
E-M-HW4v3-DIR
E-M-HW4v3-Main
E-M-HW4v3-F2-012
HygroClip 2 (HC2) Humidity Temperature Probes, User Guide
Accessories and parts for probes, indicators and transmitters
AirChip 3000 Description and Main Functions
List of the HW4 manuals
Page
Instruction Manual
50 of 51
E-M-HW4v3-F2-001
E-M-HW4v3-A2-001
E-M-HW4v3-DR-001
E-M-AC3000-CP
E-M-CalBasics
E-T-HumiDefs
E-T-AW
Note: All document file names have an extension corresponding to the document release number. This extension is not shown in the above table.
HW4 software version 3: Device Manager – HC2 probe series
HW4 software version 3: Probe Adjustment function AirChip 3000 devices
HW4 software version 3: Data Recording Function AirChip 3000 Devices
AirChip 3000 Communication Prot ocol
Humidity Definitions
Measuring water activity
© 2009-2014; Rotronic AG E-M-HP23-V2_14
Find Quality Products Online at: sales@GlobalTestSupply.com
www.GlobalTestSupply.com
Document code Unit
HP23 cannot be used to read data from 2-wire models of the HF5 transmitter series
Added AutoPowerOff function (automatic power down after a user specified time period)
HygroPalm HP23-A / HP23-AW-A hand-held indicator:
User Guide
Document title
Page

12 Document releases

Doc. Release Date Notes
_10 June 16, 2010 Original release _11 Jan. 6, 2012 _12 Jan. 25, 2012 Minor editorial changes _13 Nov. 12, 2012 _14 Nov. 7, 2014 New chapters: 4.8 and 6
Instruction Manual
Document Type
51 of 51
© 2009-2014; Rotronic AG E-M-HP23-V2_14
Find Quality Products Online at: sales@GlobalTestSupply.com
www.GlobalTestSupply.com
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