GHM Delta OHM HD2101.1 User manual

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Operating manual
Hygrometers / thermometers
HD2101.1 – HD2101.2
www.deltaohm.com
Companies / Brands of GHM
English
Keep for future reference.

HD2101 - 2 - V2.3
CONTENTS
INTRODUCTION..................................................................................................................................................... 3
KEYBOARD AND MENU DESCRIPTION ............................................................................................................ 8
THE PROBES..........................................................................................................................................................14
MEASUREMENT OF RELATIVE HUMIDITY..................................................................................................................14
Calibration of the combined humidity/temperature probe ...................................................................................14
Humidity and Comfort indices...........................................................................................................................16
DIRECT INPUT INTO Pt100, Pt1000 AND Ni1000 TEMPERATURE PROBES ...................................................................18
How to measure ................................................................................................................................................18
Instructions to connect the TP47 connector for 4 wire Pt100, Pt1000 and Ni1000 probes....................................18
Direct connection of 4 wire Pt100 sensors .........................................................................................................20
WARNINGS AND OPERATING INSTRUCTIONS ..............................................................................................21
INSTRUMENT SIGNALS AND FAULTS..............................................................................................................22
LOW BATTERY WARNING AND BATTERY REPLACEMENT.......................................................................24
INSTRUMENT STORAGE.....................................................................................................................................25
SERIAL INTERFACE AND USB ...........................................................................................................................26
STORING AND TRANSFERRING DATA TO A PERSONAL COMPUTER......................................................28
THE LOGGING FUNCTION -ONLY FOR HD2101.2......................................................................................................28
CLEARING THE MEMORY -ONLY FOR HD2101.2 ......................................................................................................28
THE PRINT FUNCTION ...........................................................................................................................................29
CONNECTION TO A PC........................................................................................................................................30
CONNECTION TO THE RS232C SERIAL PORT OF THE INSTRUMENT .............................................................................30
CONNECTION TO THE USB 2.0 PORT OF THE INSTRUMENT -ONLY FOR HD2101.2......................................................30
NOTES ABOUT WORKING AND OPERATING SAFETY .................................................................................31
INSTRUMENT TECHNICAL CHARACTERISTICS..........................................................................................32
TECHNICAL DATA OF PROBES AND MODULES IN LINE WITH THE INSTRUMENT ............................................................34
TEMPERATURE PROBES Pt100 SENSOR USING SICRAM MODULE.................................................................................34
RELATIVE HUMIDITY AND TEMPERATURE PROBES USING SICRAM MODULE................................................................35
PROBES Pt100 4WIRES AND Pt1000 2WIRES............................................................................................................35
ORDER CODES ......................................................................................................................................................36

HD2101 - 3 - V2.3
INTRODUCTION
The HD2101.1 and HD2101.2 are portable instruments with a large LCD display. They measure
relative humidity and temperature using a Pt100 sensor or thermocouple humidity/temperature
combined probe. Temperature only is measured by immersion, penetration or air contact probes.
The sensor can be a Pt100, Pt1000 or Ni1000.
When the combined humidity/temperature probe is connected, the instrument calculates and
displays the absolute humidity, the dew point, the partial vapour pressure, and the comfort indices.
The probes are fitted with automatic detection module, with the factory calibration settings already
being memorized inside.
The HD2101.2 instrument is a datalogger. It memorizes up to 38,000 samples which can be
transferred from the instrument connected to a PC via the RS232C serial port or USB 2.0 port. The
storing interval, printing, and baud rate can be configured using the menu.
The HD2101.1 and HD2101.2 models are fitted with an RS232C serial port and can transfer the
acquired measurements in real time to a PC or to a portable printer.
The Max, Min and Avg function calculate the maximum, minimum or average values.
Other functions include: the relative measurement REL, the HOLD function, and the automatic
turning off that can also be disabled.
The instruments have IP66 protection degree.
This manual describes the HD2101.1 and HD2101.2 models: if not otherwise specified, the
description is intended to be applicable to both models.

HD2101 - 4 - V2.3
Hygro-Thermometer
HD2101.1

HD2101 - 5 - V2.3
HD2101.1
1. Input for probes, 8-pole DIN45326 connector.
2. External auxiliary power supply connector input.
3. Battery symbol: displays the battery charge level.
4. Functions indicators.
5. Secondary display line.
6. HOLD/key: freezes the measurement during normal operation; in the menu, increases the
current value.
7. FUNC/ENTER key: during normal operation displays the maximum (MAX), the minimum
(MIN) and the average (AVG) of current measurements; in the menu, confirms the current
selection.
8. REL/key: enables the relative measurement (displays the difference between the current
value and the logged value when the key is pressed); in the menu, decreases the current value.
9. SERIAL key: starts and ends data transfer to the serial communication port.
10. MENU key: allows access to and exit from the menu.
11. °C/°F-ESC key: changes the unit of measurement for temperature from degrees Celsius to
Fahrenheit; in the menu, cancels the operation in progress without making changes.
12. UNIT/USER CAL key: during normal operation selects the unit of measurement for the main
variable; when pressed together with the FUNC key, starts the calibration procedure for the
probe connected to the instrument.
13. ON-OFF/AUTO-OFF key: turns the instrument on and off; when pressed together with the
HOLD key, disables the automatic turn off.
14. MAX, MIN and AVG symbols.
15. Line for main dispay
16. Line for symbols and comments.
17. 8-pole MiniDin connector for RS232C. For the connection to PC (with cable HD2110CSNM or
C206) or printer (with cable HD2110CSNM).

HD2101 - 6 - V2.3
Hygro-Thermometer
HD2101.2

HD2101 - 7 - V2.3
HD2101.2
1. Input for probes, 8-pole DIN45326 connector.
2. External auxiliary power supply connector input.
3. Battery symbol: displays the battery charge level.
4. Main display line.
5. Secondary display line.
6. HOLD/key: freezes the measurement during normal operation; in the menu, increases the
current value.
7. FUNC/ENTER key: during normal operation displays the maximum (MAX), the minimum
(MIN) and the average (AVG) of current measurements; in the menu confirms the current
selection.
8. REL/key: enables the relative measurement (displays the difference between the current
value and the logged value when the key is pressed); in the menu, decreases the current value.
9. SERIAL/ERASE LOG key: starts and ends data transfer to the serial communication port. In
the menu, clears the data contained in the instrument's memory.
10. LOG/DUMP LOG key: during normal operation, starts and ends the saving of the data in the
internal memory; in the menu, starts the data transfer from the instrument's memory to the PC.
11. Mini-USB type B connector for USB 2.0. For the connection to PC (with cable CP23).
12. MENU key: allows access to and exit from the menu.
13. °C/°F-ESC key: changes the unit of measurement for temperature from degrees Celsius to
Fahrenheit; in the menu, cancels the operation in progress without making changes.
14. UNIT/USER CAL key: during normal operation selects the unit of measurement for the main
variable; when pressed together with the FUNC key, starts the calibration procedure for the
probe connected to the instrument.
15. ON-OFF/AUTO-OFF key: turns the instrument on and off; when pressed together with the
HOLD key, disables the automatic turn off.
16. MAX, MIN and AVG symbols.
17. Main display line
18. Line for symbols and comments.
19. 8-pole MiniDin connector for RS232C. For the connection to PC (with cable HD2110CSNM or
C206) or printer (with cable HD2110CSNM).

HD2101 - 8 - V2.3
KEYBOARD AND MENU DESCRIPTION
Foreword
The instrument keyboard is composed of single-function keys, like the MENU key, and double-
function keys such as the ON-OFF/Auto-OFF key.
In the double-keys, the function in the upper part is the "main function", while the one in the bottom
part is the "secondary function". When the instrument is in standard measurement mode, the main
function is active. In the menu or in conjunction with the FUNC key, the secondary function is
enabled.
The pressing of a key is accompanied by a short confirmation beep: a longer beep sounds if the
wrong key is pressed.
Each key specific function is described in detail below.
ON-OFF/Auto-OFF key
The instrument is turned on and off using the ON/OFF key. The turning on enables all display
segments for a few seconds, starts an auto-test including the detection of the probe connected to the
input and sets the instrument ready for normal measurement.
MIN
cm
min s
2
3
m
µ
m
k
>>>
During turning on, should no probes be connected, the message "NO_PRBE_ SER_NUM" is
displayed in the line for symbols for a few seconds, and in the main line a series of dashes
appears while the ERR message replaces the temperature.
When the probe is inserted into a functioning instrument, the "NEW_PROB_DET" (New
probe detected) message appears: as the probe's data are captured upon turning the
instrument on, it is necessary to turn the instrument off and on again.
Replace the probes when the instrument is off.
+
Automatic turning off
The instrument has an AutoPowerOff function that automatically turns the instrument off after about
8 minutes if no key is pressed during the intervening time. The AutoPowerOff function can be
disabled by holding the HOLD key pressed down when turning the instrument on: the battery
symbol will blink to remind the user that the instrument can only be turned off by pressing the
<ON/OFF> key.

HD2101 - 9 - V2.3
The automatic turning off function is disabled when external power is used. On the other
hand, it cannot be disabled when the batteries are discharged.
FUNC/ENTER key
During normal measurement this enables the display and logging of the maximum (MAX),
minimum (MIN) and average (AVG) value of the measurements captured by the probe connected to
the instrument, updating them with the acquisition of new samples. The acquisition frequency is
once a second.
In the menu, the ENTER key confirms the current parameter and then goes to the next one.
The MAX, MIN and AVG measurements remain in the memory until the instrument is on, even
after exiting the calculation function. To reset the previous values and restart with a new
measurement session, press FUNC until the message "FUNC CLR" appears, then use the arrows to
select YES and confirm using ENTER.
Attention: the data captured using the Record function cannot be transferred to the PC.
HOLD/key
It increases the current parameter when used in the menu; when used in measurement mode, it freezes
the measurement in progress, and upon application of pressure on the key, the message HOLD
appears in the upper side of the display. To return to the current measurement, press the key again.
Upon turning on the instrument, the AutoPowerOff function can be disabled by holding the HOLD
key down (please see the ON-OFF key description).
UNIT/UserCAL key
In measurement mode, it allows selection of the unit of measurement of the main input quantity
(shown in the central line of the display). By repeatedly pressing the function key, the different
units of measurement are displayed in sequence:
1. %RH % of relative humidity
2. g/kg Grams of vapor in a kilogram of dry air
3. g/m3Grams of vapor in a cubic meter of dry air
4. hPa Partial vapor pressure (hPa)
5. J/g Enthalpy
6. Td Dew point (°C or °F)
7. Tw Wet bulb temperature (°C or °F)
8. DI Discomfort Index
9. NET Net Index
This setting changes the information displayed and the immediate print of data (SERIAL key). The
data recorded using the LOG function (HD2101.2) and sent to the printer or PC through the
serial port using the SERIAL function (HD2101.1 and HD2101.2), keep the chosen unit of
measurement and display it.

HD2101 - 10 - V2.3
+
%RH probe calibration
Simultaneous pressure on the UNIT and FUNC keys starts the calibration procedure of the probe
connected to the instrument. Please see the paragraph dedicated to calibration on page 14.
°C/°F - ESC key
Changes the unit of measurement for the temperature from degrees Celsius to Fahrenheit for both
the main and secondary variable.
When used in the menu, it clears or cancels the active function.
REL/key
In measurement mode, it displays the difference between the current value and that measured on
pressing the key for both measurements - main and secondary. The REL message appears on the
display; press the key again to return to the current measurement.
When used in the menu, it decreases the current variable value.
MENU Key
The first menu item is accessed by initially pressing on the MENU key; press ENTER to go to the
following items. To modify the item displayed, use the arrow keys (and ). The current value is
confirmed by pressing the ENTER key and the display moves on to the next parameter, by pressing
the ESC key the setting is cleared.
To exit the menu, press the MENU key at any time.
The menu items are listed in this order:
1) Management of logged data (only HD2101.2): the message ">>>_LOG_DUMP_or_E-
RAS" (Transfer data or erase) is scrolled in the comment line. The center figure reports the
number of free memory pages (FREE). All memory data are permanently erased by pressing
SERIAL/EraseLOG. By pressing LOG/DumpLOG, the data transfer of the logged data on
the serial port is started: the "BAUD-RATE" must have previously been set to the maximum
value (please see the menu items described below and the paragraph "STORING AND
TRANSFERRING DATA TO A PERSONAL COMPUTER" on page 28).