Delta OHM HD2328 Manuel utilisateur

Our instruments' quality level is the results of the product continuous development. This

can bring about differences between the information written in this manual and the

instrument that you have purchased. We cannot entirely exclude errors in the manual, for

which we apologize.

The data, figures and descriptions contained in this manual cannot be legally asserted. We

reserve the right to make changes and corrections without prior notice.

HD2328.0

THERMOCOUPLE

THERMOMETER

ENGLISH

REV. 1.4

Mar.

30th 2007

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Thermocouple Thermometer

HD2328

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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.

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TABLE OF CONTENTS

1. GENERAL CHARACTERISTICS............................................................................................................................. 5

2. DESCRIPTION OF THE FUNCTIONS .................................................................................................................... 6

3. THE PROGRAMMING MENU ................................................................................................................................. 9

4. PROBES AND MEASUREMENTS.......................................................................................................................... 10

4.1 TEMPERATURE MEASUREMENT .............................................................................................................................. 10

4.2 CALIBRATION OF THE INSTRUMENT ON LINE WITH THE PROBE(S)............................................................................ 10

4.2.1 Calibration sequence ...................................................................................................................................... 11

5. WARNINGS................................................................................................................................................................ 12

6. INSTRUMENT SIGNALS AND FAULTS .............................................................................................................. 13

7. LOW BATTERY WARNING AND BATTERY REPLACEMENT ..................................................................... 14

7.1 WARNING ABOUT BATTERY USE.............................................................................................................................. 14

8. INSTRUMENT STORAGE....................................................................................................................................... 15

9. NOTES ABOUT WORKING AND OPERATIVE SAFETY ................................................................................. 16

10. TECHNICAL CHARACTERISTICS .................................................................................................................... 17

11. ORDER CODES ....................................................................................................................................................... 19

11.1 THERMOCOUPLE PROBES....................................................................................................................................... 19

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1. 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.

See chapter 2 for further information.

The instrument is provided with the factory calibration. It is also possible to perform a "User

Calibration" of instrument+probe (see chapters 3 and 4).

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2. 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 HD2328.0 measures 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 key

Disabling of the automatic turning off

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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

CLR/ESC key

HOLD/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 (see chapter 3):

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

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3. 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;

-press DATA/ENTER to confirm the modification;

-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 A-B/MENU key again.

See chapter 4 for further explanations.

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4. PROBES AND MEASUREMENTS

The instrument works with thermocouple probes of type K, J, T, or E.

See chapter 3 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.

4.1 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.

4.2 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.

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