GHM Delta OHM HD2328.0 User manual

Operating manual
T
hermocouple Thermometer
HD2
328.0
www.deltaohm.com
Companies / Brands of GHM
English
Keep for future reference.

HD2328 - 2 - V1.7
CONTENTS
GENERAL CHARACTERISTICS............................................................................................................................3
DESCRIPTION OF THE FUNCTIONS ...............................................................................................................6
THE PROGRAMMING MENU ................................................................................................................................9
PROBES AND MEASUREMENTS.......................................................................................................................10
TEMPERATURE MEASUREMENT................................................................................................................................... 10
CALIBRATION OF THE INSTRUMENT ON LINE WITH THE PROBE(S)......................................................................... 10
CALIBRATION SEQUENCE –INSTRUMENT ON LINE WITH THE PROBE(S):.............................................................. 11
WARNINGS ................................................................................................................................................................12
INSTRUMENT SIGNALS AND FAULTS .........................................................................................................13
INSTRUMENT STORAGE......................................................................................................................................13
LOW BATTERY WARNING AND BATTERY REPLACEMENT ...............................................................14
WARNING ABOUT BATTERY USE................................................................................................................................. 14
NOTES ABOUT WORKING AND OPERATIVE SAFETY..........................................................................15
INSTRUMENT TECHNICAL CHARACTERISTICS .....................................................................................16
ORDERING CODES .................................................................................................................................................18

HD2328 - 3 - V1.7
GENERAL CHARACTERISTICS
The Thermocouple Thermometer Model HD2328.0 is a portable instrument with two
inputs A and B. It measures the temperature of the two input channels, and can
calculate the difference between the two channels (A-B).
It is fitted with a large LCD display for excellent visualization of the measured data.
The Thermometer Model HD2328.0 measures the temperature using immersion,
penetration, contact or air probes.
The sensor can be a thermocouple chosen among the following types:
•Type K
•Type J
•Type T
•Type E
The instrument accepts the input of one, or two, thermocouples of the same type (K-
J-T-E) even in a different form.
The units of measurement are the following:
1. °C (Celsius degrees)
2. °F (Fahrenheit degrees).
Using the Max, Min and Avg function of this instrument respectively obtains also the
maximum, minimum or average values.
Other available functions are:
•the relative measurement REL;
•the HOLD function;
•the A-B function;
•the automatic turning off which can also be disabled.
The instrument is provided with the factory calibration. It is also possible to perform a
"User Calibration" of instrument+probe (see dedicated chapters).

HD2328 - 4 - V1.7
Thermocouple Thermometer
HD2328.0

HD2328 - 5 - V1.7
HD2328.0
1. Inputs A and B for two thermocouples, with standard miniature connectors.
2. Battery symbol: displays the battery charge level.
3. Function indicators.
4. Secondary display line.
5. DATA/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.
6. CLR/ESC key: during normal operation resets the maximum, the minimum and
the average of current measurements; in the menu, it resets the value set with the
arrows.
7. HOLD/key: freezes the measurement display during normal operation; in the
menu, increases the current value.
8. A-B/MENU key: during normal operation, it displays in the secondary line the
difference of the temperatures measured by the probes connected to the inputs A
and B; when pressed together with the DATA key, it allows to open the menu.
9. REL/key: during normal operation 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.
10.ON-OFF/AUTO-OFF key: turns the instrument on and off; when pressed together
with the HOLD key, disables the AutoPowerOff function.
11.MAX (maximum value), MIN (minimum value) and AVG (average value) symbols.
12.Main display line.
13.Line for symbols and comments.

HD2328 - 6 - V1.7
DESCRIPTION OF THE FUNCTIONS
The keyboard of the Thermocouple Thermometer Model HD2328.0 is composed of
double-function keys. The function on the key is the "main function", while the one
above the key is the "secondary function".
When the instrument is in standard measurement mode, the main function is active.
In the menu, the secondary function is enabled; press the DATA+(A-B) keys
together to open the menu.
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.
The HD2328.0measures the temperature at the two inputs: the temperature
measurement at the "A" input is displayed in the main line, while the secondary line
shows the value at the "B" input.
This key has two functions:
•ON/OFF: to turn the instrument on press ON, to turn it off press OFF.
The turning on enables all display segments for a few seconds, and then the type of
calibration enabled (CAL FACT = factory calibration; CAL USER = user calibration).
•AUTO/OFF: the AutoPowerOff function can be disabled by simultaneously
pressing this key and the "HOLD" key when turning the instrument on.
If no probe is connected to one of the input connectors, the "BURN" message
appears in the corresponding line, that is, in the first line for input "A" and in
the second line for input "B".
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.
Press simultaneously the ON/OFF key and the HOLD key to disable this function.
In this case, remember to turn the instrument off using the ON/OFF key: disabling of
the automatic turning off is shown by the blinking battery symbol.
ON-OFF and AUTO-OFF
Disabling of the automatic turning off

HD2328 - 7 - V1.7
The DATA key is used for the following functions:
•DATA: during normal measurement, by pressing this key once the maximum
(MAX) value of the measurements captured by the probes connected to the
instrument is displayed, updating it with the acquisition of new samples;
-by pressing this key again the minimum (MIN) value is displayed;
-by pressing this key a third time the average (AVG) value is displayed.
The acquisition frequency is once a second.
The MAX, MIN and AVG values remain in the memory until the instrument is on,
even after exiting the DATA display function. When the instrument is off, the
previously memorized data are cleared. Upon turning on, the instrument
automatically starts memorizing the MAX, MIN and AVG values.
To reset the previous values and start with a new measurement session, press
CLR until the FUNC_CLRD message appears.
•ENTER: once the MENU has been opened with the DATA+UNIT keys, the DATA
key will perform the ENTER function and the MENU can be browsed and the
displayed parameter confirmed.
The CLR key has two functions:
•CLEAR (CLR): allows to reset the maximum (MAX), minimum (MIN) and average
(AVG) value of the captured measurements;
•ESC: once the MENU has been opened with the DATA+UNIT keys, the CLR key
will allow to cancel the parameters set using the and arrows.
The HOLD key is used for the following functions:
•HOLD: by pressing this key the current measurement update is stopped and the
"HOLD" message will appear in the upper left-hand corner of the display. To return
to the current measurement, press the key again.
•: once the MENU has been opened with the DATA+UNIT keys, the key will
allow to increase the value of the selected parameter.
Pressed together with the ON/OFF key, during turn on, the AutoPowerOff function is
disabled (see the description of the ON/OFF key).
DATA/ENTER key
HOLD/key
CLR/ESC key

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The A-B key is used for the following functions:
•A-B: in measurement mode, it displays in the secondary line the difference of the
temperatures measured by the probes connected to the inputs Aand B, and
indicates "ERR" if one of the probes is in error (not connected, faulty or
overrange). To end the function, press the key again.
•MENU: in the menu three items can be set:
1. Selection of the unit of measurement for temperature: °C or °F.
2. Selection of the type of Thermocouple: K, J, T, E.
3. Starting the User calibration procedure.
-the menu is opened by pressing simultaneously DATA+(A-B): the first item of the
instrument programming menu will appear;
-use the and arrows (respectively located above the HOLD and REL keys) to
modify the displayed value;
-press DATA/ENTER to confirm the modification and go onto the next item;
-press CLR/ESC to cancel the modification;
-to exit the menu, press the A-B/MENU key again.
The REL key is used for the following functions:
•REL: it displays the difference between the current value and that measured on
pressing the key for both measurements: main and secondary. The "REL" message
is displayed on the left. To return to the normal measurement, press the key
again.
•: once the MENU has been opened with the DATA+(A-B) keys, the key will
allow to decrease the value of the selected parameter.
REL/key
A-B/MENU key

HD2328 - 9 - V1.7
THE PROGRAMMING MENU
To access to the programming menu press simultaneously the DATA+(A-B) keys.
The items to be set are listed in this order:
1. Selection of the unit of measurement: the "SEL_MEAS_UNIT" message is
displayed in the comment line. The main line in the center of the display shows
the selected unit of measurement: Celsius (°C) or Fahrenheit (°F) degrees.:
•use the and arrows (respectively located above the HOLD and
REL keys) to modify the type of probe;
•press DATA/ENTER to confirm the modification and go onto the next
item;
•press CLR/ESC to cancel the modification;
•to exit the menu, press the A-B/MENU key again.
2. Selection of the type of Thermocouple: the "SEL" message is displayed in
the main line, while the type of probe is displayed in the comment line; in the
secondary line is shown the "tc" message.
The types of thermocouple that can be selected are: K, J, T, or E.
•use the and arrows (respectively located above the HOLD and
REL keys) to modify the type of thermocouple;
•press DATA/ENTER to confirm the modification and go onto the next
item;
•press CLR/ESC to cancel the modification;
•to exit the menu, press the A-B/MENU key again.
3. Starting the User calibration procedure: the ">>>_CAL_MODE" message
is displayed in the comment line, and "FACt" is displayed in the main line.
The instrument is provided with the factory ("FACt") calibration. It is also
possible to perform a "USER calibration" ("USEr")of instrument+probe. The
calibration information is saved in the instrument’s memory. The same
correction is applied to any probe connected to the input: therefore, the "USER
calibration" should only be used with the probe used for calibration and not with
other probes.
•use the and arrows (respectively located above the HOLD and REL
keys) and select USEr, to access the "USER calibration" procedure;
•press DATA/ENTER to confirm the modification;
•the "SEL_CHAN" message is displayed in the comment line;
•use the and arrows (respectively located above the HOLD and REL
keys) to select the input "A" or "B" in the main line;
•the "SEL_MEAS_1/2" message is displayed in the comment line;
•use the and arrows (respectively located above the HOLD and REL
keys) to select "0", "1" or "2" in the main line;
•press DATA/ENTER to confirm the modification;
•press CLR/ESC to cancel the modification;
•to exit the menu, press the UNIT/MENU key again.

HD2328 - 10 - V1.7
PROBES AND MEASUREMENTS
The instrument works with thermocouple probes of type K, J, T, or E.
See chapter ‘The programming menu’for the selection of the type of probe.
The contacts of the thermocouple probe connector are polarized. They must be
inserted on the standard miniature socket located on the instrument in the correct
direction. These probes are usually marked with a "+" and "–" sign.
The user can choose the unit of measurement for display of temperature: °C and °F.
The Thermometer HD2328.0 has two inputs: the temperature for input "A" (see
description of the inputs) is displayed in the main line: the temperature for input "B"
is displayed in the secondary line. When the "A-B" function is enabled, the relevant
differential temperature is displayed in the secondary line.
If two probes are used, they must be the same type of thermocouple.
TEMPERATURE MEASUREMENT
In all versions the thermocouple hot junction is housed in the end part of the probe.
The response time for the measurement of the temperature in air is greatly reduced if
the air is moving. If the air is still, stir the probe. The response times are longer than
those for liquid measurements.
The temperature measured by immersion is carried out by inserting the probe in the
liquid, in the oven where you wish to perform the measurement; the hot junction is
housed in the end part of the probe.
In the temperature measured by penetration the probe tip must be inserted into the
material; the hot junction is housed in the end part of the probe.
NOTE: when measuring the temperature on frozen blocks it is convenient to use a
mechanical tool to bore a cavity in which to insert the tip probe.
In order to perform a correct contact measurement, the measurement surface must
be even and smooth, and the probe must be perpendicular to the measurement plane.
So as to obtain the correct measurement, the insertion of a drop of oil or
heat-conductive paste between the surface and the probe is useful (do not
use water or solvents). This method also improves the response time.
CALIBRATION OF THE INSTRUMENT ON LINE WITH THE PROBE(S)
To calibrate the probes correctly, a knowledge of and abiding by the physical
phenomena on which the measurement is based is fundamental: this is the reason
why it is recommended to abide by what is reported below carefully, and only to
perform new calibrations if technically proficient and using the suitable equipment.
The instrument is provided with the only FACT (factory) calibration.
The user is also able to perform a USER calibration of instrument+probe.