Delta OHM HD2303.0 User manual

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.
HD2303.0
REV. 1.5
Jan.
,
29th 2009

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Anemometer
HD2303.0

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HD2303.0
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: resets the maximum, the minimum and the average of the captured
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. STD-BY: during normal operation, it sets the hot-wire probe to stand-by; in the menu, changes
the section's unit of measurement to m2or inch2.
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.

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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 WIND SPEED MEASUREMENT................................................................................................................................... 10
4.1.1 Flow rate measurement .................................................................................................................................. 11
4.2 HOT-WIRE WIND SPEED MEASUREMENT PROBES WITH SICRAM MODULE .............................................................. 12
4.2.1 Operation........................................................................................................................................................ 14
4.2.2 Warnings, care and maintenance of the probes .............................................................................................. 15
4.2.3 Dimensions of the probes............................................................................................................................... 15
4.3 VANE WIND SPEED MEASUREMENT PROBES WITH SICRAM MODULE ..................................................................... 17
4.3.1 Calibration...................................................................................................................................................... 17
4.3.2 Operation........................................................................................................................................................ 17
4.3.3 Care and maintenance of the probes............................................................................................................... 18
4.3.4 Dimensions..................................................................................................................................................... 19
4.4 DIRECT INPUT INTO Pt100 AND Pt1000 TEMPERATURE PROBES .............................................................................. 21
4.4.1 Temperature measurement ............................................................................................................................. 21
4.4.2 Connecting the TP47 connector for the 4 wire Pt100 and 2 wire Pt1000 probes........................................... 21
4.4.3 Direct connection of 4 wire Pt100 sensors..................................................................................................... 22
5. WARNINGS................................................................................................................................................................ 23
6. INSTRUMENT SIGNALS AND FAULTS .............................................................................................................. 24
7. INSTRUMENT STORAGE....................................................................................................................................... 24
8. LOW BATTERY WARNING AND BATTERY REPLACEMENT ..................................................................... 25
8.1 WARNING ABOUT BATTERY USE.............................................................................................................................. 25
9. NOTES ABOUT WORKING AND OPERATIVE SAFETY ................................................................................. 26
10. TECHNICAL CHARACTERISTICS .................................................................................................................... 27
10.1 TECHNICAL INFORMATION ON THE ANEMOMETER ............................................................................................... 27
10.2 ON LINE INSTRUMENT PROBES AND MODULES TECHNICAL DATA................................................. 28
10.2.1 Wind speed measurement probes ................................................................................................................. 28
10.2.2 Temperature probes Pt100 sensor using SICRAM module.......................................................................... 30
10.2.3 4 wire Pt100 and 2 wire Pt1000 Probes....................................................................................................... 30
11. ORDER CODES ....................................................................................................................................................... 31
11.1 PROBES COMPLETE WITH SICRAM MODULE ........................................................................................................ 31
11.2 TEMPERATURE PROBES WITHOUT SICRAM MODULE ........................................................................................... 32

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1. GENERAL CHARACTERISTICS
The Anemometer Model HD2303.0 is a portable instrument that allows to perform measurements in
the fields of air conditioning, heating and ventilation.
It is fitted with a large LCD display for excellent visualization of the measured data. The
Anemometer Model HD2303.0:
•uses hot-wire or vane probes to measure air speed, flow rate, and temperature inside pipelines
and vents;
•while temperature only is measured by immersion, penetration or contact probes; the
temperature sensor is either a Pt100 or Pt1000.
The probes are fitted with the automatic detection module, with the factory calibration settings
already being memorized inside.
The units of measurement for the measurable quantities are:
•for wind speed:
-m/s (meter/second)
-km/h (kilometer/hour)
-ft/min (foot/minute)
-mph (mile/hour)
-knot
•for calculated flow rate:
-l/s (liter/s)
-m³/s (cubic meter/second)
-m³/s (cubic meter/minute)
-m³/h (cubic meter/hour)
-ft³/s (cubic foot/second)
-ft³/min (cubic foot/minute)
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 2.

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2. DESCRIPTION OF THE FUNCTIONS
The keyboard of the Anemometer Model HD2303.0 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.
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: press this key to turn the instrument on and off.
The turning on enables all display segments for a few seconds and starts an Auto-test including the
detection of the probe connected to the input. For a very short time the filter used for measurements
(FAST or SLOW) is displayed; then the instrument carries on with the standard measurement.
MIN
cm
min s
2
3
m
µ
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, in the main line a series of dashes appears while
the "ERR" message is shown in the secondary line.
Caution! As the data are captured upon turning the instrument on, it is necessary to turn it off and
on again. Replace the probes when the instrument is 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.
Press simultaneously the ON/OFF key and the HOLD key to disable this function.
In this case, remind to turn the instrument off with the ON/OFF key: the automatic turning off
disabling is shown by the battery symbol blinking.
ON-OFF and AUTO-OFF key
Disabling of the automatic turning off

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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;
-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 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 "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 and 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 UNIT key is used for the following functions:
•UNIT: by pressing this key the unit of measurement of the main input quantity 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:
•for wind speed: m/s - km/h - ft/min - mph - knot
•for calculated flow rate: l/s - m³/s - m³/min - m³/h - ft³/s - ft³/min
By now pressing UNIT, the m/s unit of measurement is displayed again in the comment line
and, simultaneously, the unit of temperature measurement blinks. Use the and arrows, if
you wish to change the temperature display from degrees Celsius (°C) to degrees Fahreneit (°F),
or vice-versa. Confirm by pressing the UNIT key or wait for the unit of measurement to stop
blinking (about 15 seconds timeout).
•MENU: in the menu three items can be set (see chapter 3):
1. SECT m2- SECT inch2:this parameter defines a duct's section area for flow rate
calculation.
2. The filter FAST or SLOW used during measurements
3. Probe type
-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.
•During normal operation, it sets the hot-wire probe to stand-by if the probe is connected to
the input.
•In the menu, it changes the section's unit of measurement to inch2 or m2.
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/UNIT key, the key will allow to
decrease the value of the selected parameter.
REL/key
STD-BY key
UNIT/MENU key

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3. THE PROGRAMMING MENU
To access to the menu press simultaneously the following keys:
The items to be set are listed in this order:
1. SECT m2- SECT inch2: this parameter defines a duct's section area for flow rate
calculation. It is expressed in m2or inch2(see par. 4.1.1);
-use the and arrows (respectively located above the HOLD and REL keys) to
modify the displayed value;
-press STD-BY to change the unit of measurement to m2or inch2.
-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.
2. Sel Vel: selection of filter used for speed and air flow rate to reduce, when necessary, the
measurement fluctuations in case of any disturb phenomenon such as turbulences on diffuser
outputs. Select FAST to exclude the filter, SLO (Slow) to use it.
-to modify the displayed value, use the arrows UP and DOWN (placed respectively over
the HOLD and REL keys)
-push DATA/ENTER to confirm and go on to the next item, push DATA/ENTER;
-push CLR/ESC to delete the modification;
-push UNIT/MENU key again to quit.
3. 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:
•hot-wire probes complete with SICRAM module
•vane probes complete with SICRAM module
•temperature probes Pt100 complete with SICRAM module
•direct 4 wire Pt100 probes complete with TP47 module
•2 wire Pt1000 probes complete with TP47 module
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.
Upon turning on the direct 4 wire Pt100 and Pt1000 temperature probes display the
"NO_PRBE_SER_NUM" message. In this case the probe type must be entered manually
by the user:
-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 UNIT/MENU key again.

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4. PROBES AND MEASUREMENTS
The Anemometer works with hot-wire, vane and temperature probes fitted with the SICRAM
module. It works also with temperature probes with 4 wire Pt100 or 2 wire Pt1000 sensor.
Some probes are fitted with SICRAM module that 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 temperature probes without SICRAM module are not automatically detected by the instrument
and must be set up in the Probe type menu item (see chapter 3).
The probe is 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.
4.1 WIND SPEED MEASUREMENT
The probes of the AP471 and AP472 series measure the incident wind speed and flow rate. Some
also measure air temperature.
The measurement principles used are the following:
-hot-wire for the AP471 series
-vane for the AP472 series.
On request, the probes of the AP471 and AP472 series can be fitted with a telescopic rod that eases
measurements in areas difficult to reach (for example vents).
The typical applications are wind speed and flow rate checks in air conditioning, heating and
cooling systems, or environmental comfort determination, etc.
The two probe models must be used according to the wind speed:
-hot-wire probes are usually employed for precise measurements with low-medium wind speeds
(until 10 m/s);
-vane probes with speeds from 5 to 50m/s;
and according to the measured fluid temperature:
-hot-wire probes measure air flows at 80°C maximum temperature;
-vane probes measure air flows of up to 120°C, depending on the model.
Connecting the probe and turning the instrument on, it is possible to chose the unit of measurement
for the value displayed in the main line by using the UNIT key.
The following units are available:
•for wind speed: m/s - km/h - ft/min - mph (miles/hour) - knots;
•for air temperature: °C and °F;
•for flow rate: l/s (liters/s) - m3/s - m3/min - m3/h - ft3/s - ft3/min.

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4.1.1 Flow rate measurement
The flow rate measurement requires knowledge of the duct or vent area orthogonal to the flow: the
menu items indicated by "SECT m2" and "SECT INC2" define the section area m2or inch2.
To set the area value:
-press simultaneously DATA and UNIT to open the menu;
-using the 5and arrows, set the value expressed in m2;
-confirm with DATA/ENTER.
To use the inch2unit of measurement:
-select the "SECT m2" menu item;
-press STD-BY to change the unit of measurement from m2to inch2;
-using the 5and arrows, enter the desired 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.
The area comprised must be between 0.0001m2(1 cm2) and 1.9999 m2.
After input of the duct's section area:
select the unit of measurement for the flow rate by using the UNIT key:
-l/s
-m3/s
-m3/min
-m3/h
-ft3/s
-ft3/min.
The display shows the calculated flow rate on the section set with the parameters "SECT m2"
and "SECT INC2".

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4.2 HOT-WIRE WIND SPEED MEASUREMENT PROBES WITH SICRAM MODULE
The hot-wire wind speed measurement probes, fitted with SICRAM module, are the models:
•AP471 S1
•AP471 S2
•AP471 S3
•AP471 S4
•AP471 S5.
The AP471 S1 and AP471 S3 probes measure incident air flows up to 40m/s.
-The AP471 S2, AP471 S4 and AP471 S5 probes are fitted with an omnidirectional sensor
allowing measurement of speeds up to 5m/s in any direction of the air flow incident on the
probe.
-The AP471 S4 probe is also fitted with support base and sensor protection.
-The AP471 S5 is identical to the AP471 S4, but instead of a base it is provided with a telescopic
rod. The wind speed measurement is compensated for according to temperature within the range
of 0…+80°C.
The probes AP471S1, AP471 S2, and AP471S3 measure the environment temperature in the range
of -30°C…+110°C; AP471 S4 and AP471S5 in the range 0°C…+80°C.
NOTE: The AP471S… modules are calibrated in the factory; no calibration is required by the user.
A
P471 S1
A
P471 S3

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The AP471 S1, S2 and S3 probes are fitted with a cylindrical
protection screen that can slide longitudinally over a groove.
The screen has two end-of-travel positions that block it in
measurement condition (completely low) or rest condition
(completely high). To reduce the space occupied when not
used, the AP471 S4 and AP471 S5 are supplied with a
protection cylinder that can be screwed on the probe's head.
AP471 S4 - AP471 S5
SPEED SENSOR
LINE OF STREAM DIRECTIO
N
COMPENSATION SENSOR
AMBIENT
SENSOR
TEMPERATURE
CYLINDRICAL SLEEVE
AP471 S1 - AP471 S3 AP471 S2

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4.2.1 Operation
1. Extend the telescopic rod to the necessary length paying attention to the cable so that it can slide
freely and without strain;
2. Uncover the sensor;
3. Introduce the probe in the air flow being measured, maintaining the arrow at the top of the probe
parallel to the flow, as indicated in the figures.
NOTE: the probe should be maintained orthogonal to the flow and not tilted in relation to it:
OK NO
4. Proceed with measurement following the instructions provided in this chapter.
Top of the probe
Flow direction indication

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4.2.2 Warnings, care and maintenance of the probes
-The speed sensor of the AP471 Sx probes is heated and, in the presence of gas
vapours, could trigger a fire or explosion. Do not use the probe in the presence of
inflammable gases. Ensure that no gas or explosive vapour leakage is present in
the measurement spaces.
-The probe is very delicate and should be handled with extreme care. Even a simple collision,
especially of the omnidirectional probes that have an uncovered sensor, could render the probe
unusable.
-After measurement, the sensor set on the probe head must be protected with the supplied
metallic screen or threaded cylinder.
-During use, the AP471 S4 and AP471 S5 omnidirectional probes must be protected with the
special metallic grid.
-During transportation, the sensor must be closed into the special cylinder screwed on the end
part of the probe.
-Do not let fingers touch the sensors.
-Use only alcohol to clean the probe.
4.2.3 Dimensions of the probes
85 87200 min - 880 max
Ø13
Ø8
A
P471 S1
110
Ø13
Ø8
A
P471 S2
85 87
102
200 min
880 max
Ø13
Ø8
A
P471 S3

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MIN=350 - MAX=1020
∅ =120
AP471 S4 AP471 S5

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4.3 VANE WIND SPEED MEASUREMENT PROBES WITH SICRAM MODULE
The AP472 S1, AP472 S2 and AP472 S4 vane probes measure the incident wind speed and flow
rate.
The AP472 S1, AP472 S4LT and AP472 S4HT probes measure also the temperature using a
thermocouple of type K. On request, they can be fitted with a telescopic rod that eases
measurements in areas difficult to reach (for example vents). The probes' speed and temperature
measurement ranges are outlined in the table below:
Speed (m/s) Temperature (°C) Temperature
sensor
Diameter
(mm)
AP472 S1 0.6…25 -25…+80
Thermocouple
K 100
AP472 S2 0.25…20 -25…+80
(functioning temperature) ---- 60
AP472 S4L 0.6…20 -25…+80
(functioning temperature) ---- 16
AP472 S4LT 0.6…20 -30…+120 (*)
Thermocouple
K 16
AP472 S4H 10…50 -25…+80
(functioning temperature) ---- 16
AP472 S4HT 10…50 -30…+120 (*)
Thermocouple
K 16
(*) The temperature limit refers to the probe head, where the vane and temperature sensors are located, and not to the
handle, cable and telescopic rod that can be subjected to maximum temperatures of 80°C.
•Greater diameters are suitable for flow measurements in the presence of turbulence with
medium-low air speeds (i.e. at the exit of the ducts).
•Lower diameters are suitable in applications where the probe surface is much smaller than the
duct cross section within which the measurement is carried out, i.e. ventilation ducts.
4.3.1 Calibration
The AP472 S1, AP472 S2 and AP472 S4 probes are calibrated in the factory: no calibration is
required by the user.
4.3.2 Operation
1. Where present, extend the telescopic rod to the necessary length paying attention to the cable so
that it can slide freely and without strain.
2. Introduce the probe in the air flow being measured, maintaining the arrow at the top of the probe
parallel to the flow as indicated in the following figure.

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NOTE: the probe should be maintained orthogonal to the flow and not tilted in relation to it:
OK NO
The probe is correctly positioned in relation to the air-flow when the value measured is the
maximum possible.
3. Proceed with measurement following the instructions provided in the introductory paragraphs of
this chapter.
4.3.3 Care and maintenance of the probes
The probe performance, mainly at low speeds, largely depends on the very slow friction of the vane
on its own axis. In order not to compromise this characteristic, it is recommended that forcing is
avoided, as well as blocking or rotating the vane with the fingers, and if possible, avoid inserting it
in air flows that could soil the probe, and do not exceed its measurement capacity.

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4.3.4 Dimensions
1
ø100
3
ø60
1
3
ø16
1
2
3
AP472 S1 AP472 S2 AP472 S4

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Further to the telescopic extension shaft with the directional head, the probes AP472S1 – AP472
S2 can be used with the stiff extension shaft diam.16mm. In order to screw the handle off (3) hold
the probe tight on point (1). Screw the shaft top AP471S1.23.6 on the screw (2). Other extension
shafts AP471S1.23.6 can be added. The handle (3) or the extension shaft AP471A1.23.7 (6) are the
last element.
The probe AP472S4 can be used only with the stiff extension shafts AP471S1.23.6.