Thorne & Derrick HygroPalm HP21 Manual de usuario

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

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Unit

HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

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1of 14

Document title

HygroPalm HP21 Hand-Held Indicator

User Guide

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

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Table of contents

1Overview ..................................................................................................................................................3

2General description.................................................................................................................................3

2.1 Power supply.........................................................................................................................................3

2.2 Measured parameters...........................................................................................................................3

2.3 Calculated parameters..........................................................................................................................3

2.4 Sensor protection (dust filter) ................................................................................................................3

2.5 Service connector..................................................................................................................................4

3User configurable settings and functions.............................................................................................4

3.1 Function overview .................................................................................................................................4

3.2 Factory default settings.........................................................................................................................6

4Operation .................................................................................................................................................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

5Maintenance.............................................................................................................................................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

6Firmware updates..................................................................................................................................11

7Technical data .......................................................................................................................................12

7.1 Specifications......................................................................................................................................12

7.2 Dew point accuracy.............................................................................................................................13

8Accessories ...........................................................................................................................................14

9Supporting documents.........................................................................................................................14

10 Document releases................................................................................................................................14

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

Document Type

Page

3of 14

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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-to-

date 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.

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

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2.5 Service connector

The service connector is a UART digital interface (Universal Asynchronous Receiver Transmitter) with a mini-

USB 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

MEASUREMENT ACCURACY AND RELIABILITY

AirChip 3000 Functions

Description

►Humidity / temperature adjustment

o1-point or multi-point humidity calibration or adjustment

o1-point or 2-point temperature calibration or adjustment

oGenerate a time stamp for calibrations and adjustments

oRetain and view last adjustment date and adjustment values

oGenerate calibration and adjustment protocols

►Automatic humidity sensor test

and optional drift compensation

Tests the humidity sensor for drift caused by contaminants and

can be used to automatically apply a correction. The test is

automatically carried out at regular intervals of time. Can be

configured, enabled, or disabled

The humidity sensor status can be verified either with the HW4

software or with the instrument display and is shown as Good,

SQ-tuned (corrected for drift) or Bad (defective)

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

Document code

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HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

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►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

oStart or stop data recording - up to 2000 value pairs (%RH

and temperature). Starting a recording session erases all

previously recorded data

oThe recording mode and log interval can be specified

oWhen the device is powered off, the recording session is

paused but not ended As long as the recording session has

not been ended, the device automatically resumes recording

data when powered up again

oThe recorded data can be downloaded to a PC with the

HW4 software, time stamped and viewed

MEASUREMENT LOOP VALIDATION

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

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

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3.2 Factory default settings

Notes:

oConfiguration of the HP21 by the user and access to its functions requires a PC with the ROTRONIC HW4

software (version 2.1.1 or higher) installed. Service cable AC3006 is used to connect the HP21 service

connector to a USB port of the PC.

oSettings and functions that can also be either partially or fully accessed from the keypad are marked with

the letter K(see also Operation > Internal Menu).

Configurable Settings

Factory default

Unit system

Metric, except USA: English

Psychrometric calculation

Dew / frost point

Display resolution

1 decimal

Display backlight

On Key Press

Displayed parameters

%RH and temperature

Trend indicator (display)

Enabled

Communication protocol

RO-ASCII

RS-485 address

Device name

Instrument model

Functions

Factory default

Humidity / temperature adjustment

Device write protection

Disabled

Menu access from keypad

Enabled

Limit humidity output to 100 %RH

Enabled

Out-of-limit value digital / display alarm

Disabled

Data recording

Enabled (loop mode –10 min. interval)

Automatic humidity sensor test

Disabled

Humidity sensor drift compensation

Disabled

Simulator mode

Disabled

oFor a detailed description of all AirChip 3000 / HP21 main functions see document E-T-AC3000-DF-V1

oInstructions regarding the configuration of the HP21 and access to its functions are provided in the

following manuals:

E-M-HW4v3-Main

E-M-HW4v3-F2-004

E-M-HW4v3-DR-001

E-M-HW4v3-A2-001

E-M-AC3000-CP

oThe factory default setting for dew / frost point calculation is frost point below freezing

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

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Unit

HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

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4 Operation

4.1 Display

The LC display of the HP21 has a backlight which

can be set to be on all the time or whenever a key is

pressed. The backlight can also be disabled.

The upper line corresponds to relative humidity or

dew / frost point and the bottom line corresponds to

temperature.

The display can be configured to show a trend

indicator on each line:

▲: increasing value

▼: decreasing value

In the event of an alarm the display shows the symbol [ ! ] to the right of the value.

For instructions see the following HW4 manual: E-M-HW4v3-F2-004.

4.2 Keypad

ON/OFF: Turns the instrument on or off

MENU: Press this key to activate the

internal menu. Press this key

again to exit the menu

UP / DOWN: When the menu is active, use these

keys to navigate the menu, make a

selection or change a value

ENTER: When the menu is active, press

this key to confirm a selection.

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

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HygroPalm HP21 hand-held indicator:

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4.3 Internal menu

Note: Unauthorized access to the menu can be prevented by disabling the “display menu” setting

(use the HW4 software > Device Manager > Display)

Main Menu

Menu Items

Selections / Information

Notes

Settings

Unit

°C / °F

Temperature / dew or frost point

Record

On / Off

Data recording (max. 2000 values)

Back Light

Key Press / On / Off

Display backlight mode

Device Information

Version

Firmware version

Serial Nbr

Serial number

Address

RS-485 address

Type

Device type

Name

Device name

User defined

SensorTest

Humidity sensor status

Off / Good / SQ-Tuned / Bad

Humidity Adjust

RefValue

Humidity reference value

± 0.1 %RH steps

1-point adjustment only (offset)

Temperature Adjust

RefValue

Temperature reference value

± 0.1 ˚C steps

1-point adjustment only (offset)

Notes:

oRecord: both the recording mode (start / stop and the log interval cannot be changed from the menu and

are as configured with the ROTRONIC HW4 software

oSensorTest: Off means that the humidity sensor has not been tested due to the configuration settings of

the test. For a description of the automatic humidity sensor test and drift compensation (SQ-tuning) see

documents E-T-AC3000-DF-V1 and E-M-HW4v3-F2-004

4.4 Changing the parameters shown on the display

When the menu is not active, press the ENTER key to change which parameters are shown on the display:

oRelative humidity and temperature

oDew / frost point and temperature (when calculated parameter is enabled)

4.5 Changing the temperature unit

The temperature unit of the HP21 (°C or °F) can be changed from the keypad (Menu > Settings > Unit).

Press the MENU key to show the internal menu on the display

With the menu item Settings highlighted, press the ENTER key

With the menu item Unit highlighted, press the ENTER key

Use the UP or DOWN key to change the temperature unit as desired

Press the MENU key twice to exit the menu and return the HP21 to normal operation

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

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HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

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The optional HW4 software can also be used to change the unit system:

4.6 Low battery indicator

When the battery is down to about 20% of its initial charge, “Low Battery”appears at the bottom of the display.

4.7 Practical advice for measuring humidity

The most common source of error when measuring relative humidity is a difference between the

temperature of the probe and the temperature of the environment. At a humidity condition of 50 %RH, a

temperature difference of 1 C (1.8 F) typically results in an error of 3 %RH on relative humidity.

When using the HP21 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.

5 Maintenance

5.1 Service cable

Cable AC3006 converts UART (service connector) to USB and is used to connect the HP21 to a USB port

of a PC running the ROTRONIC HW4 software. Prior to using this cable, 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.

As an alternative, cable AC2001 is used to connect the HP21 to a probe input of the HP23 hand-held

calibrator. For service purposes, the HP23 offers essentially the same functionality as the HW4 software.

5.2 Location of the service connector (mini USB type)

WARNING: the service connector is a UART

interface with a mini-USB connector type. Do not

connect the service connector directly to the USB

port of a PC or hub.

The service connector (UART interface) can be

accessed without opening the enclosure after

removing the protective red round cover.

E-M-HP21-V1_21

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroPalm HP21 hand-held indicator:

User Guide

Instruction Manual

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10 of 14

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5.3 Periodic calibration check

Both the Pt 100 RTD temperature sensor 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 HP21 should be verified every 6 to 12 months. Applications

where the HP21 is exposed to significant pollution may require more frequent verifications.

a) Procedure for adjusting the HP21 from the keypad

The keypad of the HP21 allows a 1-point adjustment of temperature or humidity against a reference.

A 1-point adjustment has the effect of adding the same offset to all measured values. A multi-point

adjustment is not possible from the keypad and requires using either a PC with the HW4 software

installed or the HP23 hand-held calibrator.

When the parameter to be adjusted is stable, press the MENU key to show the internal menu on the

display

Use the DOWN key to select either H-Adjust or T-Adjust and press the ENTER key

Make sure that the text line beginning with RefValue is highlighted and press the ENTER key

Use the UP or DOWN key to change the reference value as desired

Use the DOWN key to highlight the Adjust text line and press the ENTER key

The HP21 confirms the adjustment with the message “Adjust OK”

Press the MENU key twice to exit the menu and return the HP21 to normal operation

Notes:

oThe calibration point is automatically deleted from the probe memory after an adjustment

oInstructions for using the ROTRONIC calibration devices and humidity standards are provided in

document E-M-CalBasics

oBecause the HP21 has no real time clock, the date of the adjustment is not written to the HP21. If

retaining the adjustment date is important, use the HW4 software to adjust the HP21.

b) Procedure for adjusting the HP21 with the ROTRONIC HW4 software:

Use cable AC3006 to connect the service connector of the HP21 to the 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

Start HW4 on the PC and search for the HP21(HW4 Main Menu Bar > Devices and Groups > Search

for USB Masters).

After finding the HP21 with HW4, expand the device tree to see the HP21 functions.

Select Probe Adjustment.

For further instructions see HW4 manual E-M-HW4v3-A2-001

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