GHM Delta OHM HD2304.0 User manual

Operating manual
Manometer
-Thermometer
HD2304.0
www.deltaohm.com
English
Keep for future reference.

HD2304 - 2 - V1.8
INDEX
GENERAL CHARACTERISTICS ......................................................................... 3
DESCRIPTION OF THE FUNCTIONS................................................................. 6
THE PROGRAMMING MENU........................................................................... 10
PROBES AND MEASUREMENTS...................................................................... 11
PP471 MODULE FOR PRESSURE MEASUREMENT ..........................................................11
PT100 TEMPERATURE PROBES ..............................................................................12
TEMPERATURE MEASUREMENT............................................................................12
CONNECTING THE TP47 CONNECTOR...................................................................12
DIRECT CONNECTION OF 4-WIRE Pt100 SENSOR ....................................................14
INSTRUMENT SIGNALS AND FAULTS ............................................................ 15
WARNINGS .................................................................................................. 16
INSTRUMENT STORAGE................................................................................ 17
LOW BATTERY WARNING AND BATTERY REPLACEMENT ............................... 18
WARNING ABOUT BATTERY USE.............................................................................18
NOTESABOUT WORKING AND OPERATIVE SAFETY........................................ 19
TECHNICAL CHARACTERISTICS.................................................................... 20
TECHNICAL CHARACTERISTICS OF THE MANOMETER-THERMOMETER..................................20
TECHNICAL DATA OF PROBES AND MODULES IN LINE WITH THE INSTRUMENT........................21
PRESSURE MEASUREMENT BY PP471 MODULE ........................................................21
SONDE DI TEMPERATURA SENSORE Pt100 CON MODULO SICRAM..................................22
Pt100 4-WIRE PROBES...................................................................................22
ORDERING CODES........................................................................................ 23

HD2304 - 3 - V1.8
GENERAL CHARACTERISTICS
The HD2304.0 Manometer - Thermometer is a portable instrument that allows
measurement of absolute, relative and differential pressure, and temperature.
•The PP471 electronic module is used to measure the pressure. The module
works as an interface between the instrument and the TP704 and TP705 series
Delta Ohm probes.
•The temperature is detected using immersion, penetration, contact or air
Pt100 probes with SICRAM module, or direct 4 wire Pt100 probes.
The probes are fitted with the SICRAM automatic detection module, with the factory
calibration settings already being memorized inside.
The units of measurement for the measurable quantities are:
•Pa (Pascal)
•hPa (hectopascal)
•kPa (kilopascal)
•mbar (millibar)
•bar (bar)
•atm (atmosphere)
•mmHg (millimeter of mercury)
•mmH2O (millimeter of water)
•kgf/cm² (kilogram-force/square centimeter)
•PSI
•inchHg (inch of mercury)
•inchH2O (inch of water)
•°C/°F
Using the MAX, MIN and AVG function of this instrument respectively obtains the
maximum, minimum or average values.
Other available functions are:
•the relative measurement REL;
•the HOLD function;
•the automatic turning off which can also be disabled.
For further details, see chapter ‘Description of the functions’ at page 6.

HD2304 - 4 - V1.8
Manometer - Thermometer
HD2304.0

HD2304 - 5 - V1.8
HD2304.0
1. Input for probes, 8-pole DIN45326 connector.
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 during normal operation; in the menu,
increases the current value.
8. UNIT/MENU key: it allows selection of the unit of measurement; when pressed
together with the DATA key, it allows to open the menu.
9. ZERO: performs the zero of the pressure probes.
10.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.
11. ON-OFF/AUTO-OFF key: turns the instrument on and off; when pressed
together with the HOLD key, disables the AutoPowerOff function.
12. MAX (maximum value), MIN (minimum value) and AVG (average value)
symbols.
13. Main display line.
14. Line for symbols and comments.

HD2304 - 6 - V1.8
DESCRIPTION OF THE FUNCTIONS
The keyboard of the HD2304.0 Manometer – Thermometer 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.
Once the Settings Menu has been opened, by pressing simultaneously the
DATA+UNIT keys, 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.
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, starts an Auto-test
including the detection of the probe connected to the input, and sets the instrument
ready for normal measurement. The following is displayed:
MIN
cm
min s
2
3
mµ
m
k
>>>
•AUTO/OFF: the AutoPowerOff function can be disabled by simultaneously
pressing this key and the "HOLD" key when turning the instrument on.
During turning on, should no probes be connected, the "NO_PRBE_SER_NUM"
message is displayed in the line for symbols for a few seconds, while the "ERR"
message is shown in the central part of the display. When the probe is inserted into a
functioning instrument, the "NEW_PROB_DET" (New probe detected) message
appears, while the "ERR" message is shown in the central part of the display, and a
sequence of "beeps" is simultaneously issued. As the data are captured upon turning
the instrument on, it is necessary to turn it off and on again.
Caution! Replace the probes when the instrument is off.
ON/OFF and AUTO/OFF key

HD2304 - 7 - V1.8
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.
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 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 probe 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 and 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 calculation 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
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. During electrode calibration, it allows to
decrease the nominal buffer value.
The HOLD key is used for the following functions:
•HOLD: by pressing this key the current measurement is frozen 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+MENU key, the key will
allow to increase the value of the selected parameter.
DATA/ENTER key
HOLD/key
Disabling of the automatic turning off
CLR/ESC key

HD2304 - 8 - V1.8
Pressed together with the ON/OFF key, during turn on, the AutoPowerOff function is
disabled (see the description of the ON/OFF key).
The UNIT key is used for the following functions:
•UNIT: by pressing this key the unit of measurement of the input probe is
selected: the unit of measurement will appear in the upper part of the display;
the measured value will be displayed in the central line. By repeatedly pressing
the UNIT key, the desired unit of measurement can be selected between the
following:
oPressure measurement unit:
Pa (Pascal)
hPa (hectoPascal)
kPa (kiloPascal)
mbar (millibar)
bar (bar)
atm (atmosphere)
mmHg (millimeter of mercury)
mmH2O (millimeter of water)
kgf/cm² (kilogram-force/square centimeter)
PSI
inchHg (inch of mercury)
inchH2O (inch of water)
oTemperature measurement unit:
°C (Celsius degrees)
°F (Fahrenheit degrees)
•MENU: the menu includes the Probe Type item. This item displays the type of
probe connected to the instrument's input(see chapter xx):
- the menu is opened by pressing simultaneously DATA+UNIT: 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 UNIT/MENU key again.
By pressing this key, the ZERO of the pressure probes is performed.
•In the differential pressure probes leave the two inputs open, so that they
detect the same pressure.
•In the relative pressure (compared to the atmosphere) probes, leave the input
open, so that it detects the atmospheric pressure.
•In the absolute pressure probes, apply the vacuum by using a suitable pressure
calibrator.
UNIT/MENU key
Tasto ZERO

HD2304 - 9 - V1.8
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. 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 UNIT+MENU key, the key will
allow to decrease the value of the selected parameter.
REL/key

HD2304 - 10 - V1.8
THE PROGRAMMING MENU
To access to the menu press simultaneously the following keys:
Menu:
Probe type: the "PRBE_TYPE" message is displayed in the comment line. The main
line in the center of the display shows the type of probe connected to the instrument.
The following probes can be connected to the input:
•TP704 and TP705 pressure probes combined with the PP471 module: the type
of probe (i.e. if the PP471 module and the TP704-2BAI probe (2 bar absolute)
are connected) is shown in the central part of the display. In the main line "2"
is displayed, which indicates the sensor's bottom scale. The unit of
measurement "bAr" and the sensor characteristic "Abs" (absolute) are
displayed alternately in the secondary line;
•temperature probes "Pt100" complete with SICRAM module: the "Auto"
message is displayed in the central part of the display;
•direct 4 wire "Pt100" temperature probes: in this case, the "100Pt_4u"
message is displayed.
NOTE: Upon turning on the instrument automatically detects the probes fitted with
SICRAM module: the type of probe is configured by the instrument and cannot be
modified by the user.
If direct 4 wire "Pt100" probes that are not manufactured by "Delta OHM" are
connected to the instrument, the NO_PRBE_SER_NUM message is displayed .
-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 exitthe menu, press the UNIT/MENU key again.

HD2304 - 11 - V1.8
PROBES AND MEASUREMENTS
The instrument measures absolute, relative and differential pressure using the PP471
SICRAM module and the TP704 and TP705 series probes. It also measures the
temperature with a Pt100 sensor with SICRAM module or with direct 4 wire Pt100
probes.
The SICRAM module acts as an interface between the sensor on the probe and the
instrument. There is a microprocessor circuit with a permanent memory inside the
module that enables the instrument to recognize the type of probe connected and to
read its calibration information.
The probes are detected during turn on, and this cannot be performed when
the instrument is already on, therefore if a probe is connected and the
instrument is on, it is necessary to turn it off and on.
The probes fitted with SICRAM module are calibrated in the factory; no calibration is
required by the user.
PP471 MODULE FOR PRESSURE MEASUREMENT
The PP471 module acts as an interface between the TP704 and TP705 series Delta
OHM probes and the instrument. The TP704 series pressure probes have a 1/4" BSP
threaded male connection, and must be screwed into the system using the necessary
sealing gaskets. The TP705 series have two Ø5 connections where the suitable tubes
are inserted in order to perform the desired measurement.
Caution! Please pay careful attention to the joint pressure sealing; use suitable
gaskets and joints. The threaded connection is protected by a plastic cap. Put it back
after use as it protects the pressure cell from foreign bodies.
IMPORTANT! Ensure the probe's bottom scale is higher than the pressure that
will be measured. In case this value is unknown, start by using higher-
capacity probes.
For every pressure probe a range of overload pressure and a burst pressure
are declared: pressures in the range of overload pressure don’t cause the
break of the sensor but the declared accuracy can be overcome. Pressure over
the stated burst pressure may break the sensor. The application of higher
pressures than the overload pressure limit, although lower than the burst
pressure, may produce permanent damage to the probe (e.g. offset shift).
Never exceed the stated burst pressure (see Technical Characteristics of the
probes at page xx)
Upon turning on the instrument automatically detects the PP471 module. The probe's
type (absolute, relative or differential) and bottom scale value are detected even
when the instrument is on (see chapter 3).
To change the instantaneous or peak value unit of measurement, press UNIT. The
following units of measurement are available:
Pa, hPa, kPa, mbar, bar, atm, mmHg, mmH2O, kgf/cm2, PSI, inchHg, inchH2O.
Some units of measurement require a degree of multiplication:
•the "-3" symbol indicates the displayed value must be divided by 1,000;
•the "3" and "6" symbols indicate the displayed value must be multiplied
respectively by 1,000 or by 1,000,000.
The instrument does not automatically detect the probes which are not fitted with
SICRAM module.

HD2304 - 12 - V1.8
Pt100 TEMPERATURE PROBES
The instrument accepts the input of platinum temperature probes with resistances of
100Ω (Pt100).
The Pt100 sensors are connected to 4 wires; the excitation current was chosen in
order to minimize the sensor self-heating effects.
All probes with module are calibrated in the factory; no calibration is usually required
by the user.
The °C or °F unit of measurement can be chosen using the UNIT key.
TEMPERATURE MEASUREMENT
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. Please remember that the response
times in any case are longer than those for liquid measurements.
The temperature measurement by immersion is carried out by inserting the probe in
the liquid for at least 60 mm; the sensor is housed in the end part of the probe.
In the temperature measurement by penetration the probe tip must be inserted to a
depth of at least 60 mm, the sensor 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.
CONNECTING THE TP47 CONNECTOR
All probes produced by Delta Ohm are provided with a connector.
The HD2304 also work with direct 4 wire Pt100 probes manufactured by other
producers: for the instrument connection is prescribed the TP47 connector to which
the probe’s wires should be welded.
The instructions to connect the Platinum probe to the TP47 module are provided
below.
The TP47 module is supplied complete with fairlead and gasket for 5 mm maximum
diameter cables. Do the following to open the module and connect a probe:
1. unscrew the fairlead;
2. extract the gasket;
3. remove the label using a cutter;

HD2304 - 13 - V1.8
4. unscrew the ring on the opposite side as illustrated in the figure:
5. open the two module shells: the printed circuit to which the probe must be
connected is housed inside. On the left there are the 1…4 points on which the
sensor wires must be welded. The JP1…JP4 jumpers are in the center of the board.
These must be closed with a tin bead for some type of sensors:
1
2
3
4
Pt100 3 fili
Pt1000
Ni1000
Not Used
Caution! Before welding, pass the probe cable through the fairlead and gasket.
6. Weld the wires as shown in the table:
Sensor
Board connection
Jumper to close
Pt100 4
wires
4JP4
3JP3
1JP1
2 JP2
Pt100
4 wires
None
Ensure the welds are clean and perfect.
7. Once the welding operation is complete, close the two shells;
8. insert the gasket in the module;
9. screw the fairlead and the ring.
10. At the other end of the module, enter the ring with the O-Ring as indicated in the
picture
11.Make sure the cable is not twisted while you are screwing the fairlead. Now the
probe is ready.

HD2304 - 14 - V1.8
DIRECT CONNECTION OF 4-WIRE Pt100 SENSOR
4 wire Pt100 sensors can be
soldered directly to the pins of
the flying female connector
without making use of the TP47
board. The 4 wires of the Pt100
sensors have to be soldered as
indicated in the figure on the left.
In order to use this type of probe
it is necessary to set up the
menu item “Probe Type” as
described at page 10.
The P100 probe is recognized
upon turning on the instrument:
connect the probe when the
instrument is switched off and
then turn it on.
Sensor
Direct soldering to the
connector
Pt100 4
wires
View of the soldering side
of the flying female connector

HD2304 - 15 - V1.8
INSTRUMENT SIGNALS AND FAULTS
The following table lists all of the indications displayed by the instrument in different
operating and error situations.
Display indications
Explanation
PROB
COMM LOST
This appears if the SICRAM module connected to the channel
has already been detected by the instrument, but is
disconnected. At the same time an intermittent beep is issued.
OVER
Measurement overflow: this appears if the pressure sensor
exceeds the limit of 120% of the full scale nominal value. Over
125%, the display indicates ERR.
Measurement overflow: this appears if the external
temperature probe is measuring a value exceeding the set
measuring range.
ERR
This appears in the menu if a module has already been
detected by the instrument, but is disconnected.
PROB
ERR
A probe with SICRAM module has been inserted when not
admissible for that specific instrument.
SYS
ERR
#
Instrument management program error. Contact the
instrument’s supplier and communicate the numeric code #
reported by the display.
CAL
LOST
Program error: it appears after turning on for a few seconds.
Contact the instrument’s supplier.
BATT TOO LOW
CHNG NOW Indication of insufficient battery charge appearing on turning
on. The instrument issues a long beep and turns off. Replace
the batteries.
### BAR ABS
Probe ###bar absolute.
### BAR DIFF
Probe ###bar differential.
### BAR GAUG
Probe ###bar relative.
### BAR SG
Probe ###bar relative compared to 1 bar.
### mBAR ABS
Probe ###mbar absolute.
### mBAR DIFF
Probe ###mbar differential.
### mBAR GAUG
Probe ###mbar relative.
PROB_SER #### ####
Serial number #### #### of the probe connected to the
input.
ERR
Error.
FUNC CLRD
Max, min and average values cleared.
NEW PROBE DET New probe detected at the input
PLS_EXIT >>> FUNC
RES_FOR_FACT ONLY
P
lease exit using ESC >>> function reserved to factory
calibration.
PRES_REL_TO_ZERO
ENTR_TO_MENU Press REL to reset probe or ENTER to access menu.
prob ERR
Error – unexpected probe.
SYS ERR #
Program error number #.

HD2304 - 16 - V1.8
WARNINGS
1. Do not expose the probes to gases or liquids that could corrode the material of the
sensor or the probe itself. Clean the probe carefully after each measurement. Some
pressure probe models are suitable for measurement of non-corrosive gases or air
and dry and not liquid only: check the membrane compatibility with the plant fluid.
2. Do not bend the probe connectors or force them upward or downward. Do not bend
or force the contacts when inserting the probe connector into the instrument.
3. Do not bend, deform or drop the probes, as this could cause irreparable damage.
4. Always select the most suitable probe for your application.
5. Do not use the temperature probes in presence of corrosive gases or liquids. The
sensor container is made of AISI 316 stainless steel, while the contact probe
container is made from AISI 316 stainless steel plus silver. Avoid contact between
the probe surface and any sticky surface or product that could corrode or damage it.
6. Above 400°C and below –40°C, avoid violent blows or thermal shocks to Platinum
temperature probes as this could cause irreparable damage.
7. To obtain reliable measurements, temperature variations that are too rapid must be
avoided.
8. Temperature probes for surface measurements (contact probes) must be held
perpendicular against the surface. Apply oil or heat-conductive paste between the
surface and the probe in order to improve contact and reduce reading time.
Whatever you do, do not use water or solvent for this purpose. A contact
measurement is always very hard to perform. It has high levels of uncertainty and
depends on the ability of the operator.
9. Temperature measurements on non-metal surfaces usually require a great deal of
time due to the low heat conductivity of non-metal materials.
10.Probes are not insulated from their external casing; be very careful not to
come into contact with live parts (above 48V). This could be extremely
dangerous for the instrument as well as for the operator, who could be
electrocuted.
11.Avoid taking measurements in presence of high frequency sources, microwave
ovens or large magnetic fields; results may not be very reliable.
12.Clean the probe carefully after use. Clean the probe pressure chamber carefully.
Avoid deposits or incrustations left by the fluid coming into contact with the
membrane, as with time this could cause measurement errors.
13.Avoid inserting nails or spikes into the pressure chamber as the membrane could be
unintentionally torn.
14.In order to fix the probes, use a suitable fixed wrench, and possibly sealing gaskets.
15.Great attention must be paid while installing the probes in containers and
tubes under pressure. Also pay attention to the probes’ bottom
scale. In addition to the irreparable damage, it can even cause
serious physical damage to both the operator and things. Before the
probe a stop valve should always be present. Ensure that the plant is not
subject to abnormal or unexpected depressed fluid fluctuations.
16.The instrument is water resistant and IP67, but should not be immersed in water.
The probe connectors must be fitted with sealing gaskets. Should the instrument fall
into the water, check for any water infiltration. Gently handle the instrument in such
a way as to prevent any water infiltration from the connectors’ side.

HD2304 - 17 - V1.8
INSTRUMENT STORAGE
Instrument storage conditions:
•Temperature: -25…+65°C.
•Humidity: less than 90%RH without condensation.
•Do not store the instrument in places where:
•humidity is high;
•the instrument may be exposed to direct sunlight;
•the instrument may be exposed to a source of high temperature;
•the instrument may be exposed to strong vibrations;
•the instrument may be exposed to steam, salt or any corrosive gas.
The instrument case is made of ABS plastic: do not use any incompatible solvent for
cleaning.

HD2304 - 18 - V1.8
LOW BATTERY WARNING AND BATTERY REPLACEMENT
The battery symbol
on the display constantly shows the battery charge status. To the extent that batteries
have discharged, the symbol "empties". When the charge decreases still further it
starts blinking.
In this case, batteries should be replaced.
If you continue to use it, the instrument can no longer ensure correct measurement.
However, the memory data are maintained.
If the battery charge level is insufficient, the following message appears
when you turn the instrument on:
BATT TOO LOW
CHNG NOW
The instrument issues a long beep and turns off. In this case, replace the
batteries in order to turn the instrument back on.
To replace the batteries, proceed as follows:
1. switch the instrument off;
2. unscrew the battery cover counter clockwise;
3. replace the batteries (3 1.5V alkaline batteries - type AA);
4. screw the cover on clockwise.
Malfunctioning upon turning on after battery replacement.
After replacing the batteries, the instrument may not restart correctly; in this case,
repeat the operation.
After disconnecting the batteries, wait a few minutes in order to allow circuit
condensers to discharge completely; then reinsert the batteries.
WARNING ABOUT BATTERY USE
•Batteries should be removed when the instrument is not used for an extended
time.
•Flat batteries must be replaced immediately.
•Avoid batteries leaking.
•Always use good quality leakproof alkaline batteries. Sometimes on the market, it
is possible to find new batteries with an insufficient charge capacity.

HD2304 - 19 - V1.8
NOTES ABOUT WORKING AND OPERATIVE SAFETY
Authorized use
The technical specifications as given in chapter TECHNICAL CHARACTERISTICS must
be observed. Only the operation and running of the measuring instrument according
to the instructions given in this operating manual is authorized. Any other use is
considered unauthorized.
General safety instructions
This measuring system is constructed and tested in compliance with the EN 61010-1
safety regulations for electronic measuring instruments. It left the factory in a safe
and secure technical condition.
The smooth functioning and operational safety of the measuring system can only be
guaranteed if the generally applicable safety measures and the specific safety
instructions in this operating manual are followed during operation.
The smooth functioning and operational safety of the instrument can only be
guaranteed under the environmental and electrical operating conditions that are in
specified in chapter TECHNICAL CHARACTERISTICS.
Do not use or store the product in places such as listed below:
•Rapid changes in ambient temperature which may cause condensation.
•Corrosive or inflammable gases.
•Direct vibration or shock to the instrument.
•Excessive induction noise, static electricity, magnetic fields or noise.
If the measuring system was transported from a cold environment to a warm
environment, the formation of condensate can impair the functioning of the measuring
system. In this event, wait until the temperature of the measuring system reaches
room temperature before putting the measuring system back into operation.
Obligations of the purchaser
The purchaser of this measuring system must ensure that the following laws and
guidelines are observed when using dangerous substances:
EEC directives for protective labour legislation
National protective labour legislation
Safety regulations

HD2304 - 20 - V1.8
TECHNICAL CHARACTERISTICS
TECHNICAL CHARACTERISTICS OF THE MANOMETER-THERMOMETER
Instrument
Dimensions (length x width x height) 140 x 88 x 38 mm
Weight 160 g (complete with batteries)
Material ABS
Display 2x4½ digits plus symbols
Visible area: 52 x 42 mm
Operating conditions
Operating temperature -5…+50 °C
Warehouse temperature -25…+65 °C
Working relative humidity 0…90% RH without condensation
Protection degree of the case IP67
Power
Batteries 3 1.5V type AA batteries
Autonomy 200 hours with 1800 mAh alkaline
batteries
Power absorbed with instrument off < 20 µA
Connections
Input for probes 8-pole male DIN45326 connector
Unit of measurement Pa, hPa, KPa, mbar, bar, atm, mmHg,
mmH2O, kgf/cm2,PSI, inchHg, °C, °F
Measurement of temperature by Instrument
Pt100 measurement range -200…+650 °C
Resolution 0.1 °C
Accuracy ±0.1 °C
Drift after 1 year 0.1 °C/year