Kobold HND-P Series User manual

Operating Instructions
for
Hand held Pressure Measuring Devices
with Integrated Pressure Sensors
Model:
HND-P121 HND-P123
HND-P126 HND-P127
HND-P129

HND-P121/-123/-126/-127/-129
page 2 HND-P121-129 K04/1121
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Regulation Use ............................................................................................. 3
5.Operating Principle ........................................................................................ 4
6.Electrical Connection .................................................................................... 4
6.1Mains Operation with Power Supply .................................................... 4
7.Operation / Configuration / Adjustments ....................................................... 5
7.1General ................................................................................................ 5
7.2Pop-up clip ........................................................................................... 7
7.3Calibration Services ............................................................................. 8
7.4Configuration ....................................................................................... 8
7.5The Serial Interface ............................................................................. 9
7.6Zero Displacement Sensor ('OFFS') .................................................. 10
7.7Scale Correction Sensor ('SCAL') ...................................................... 10
7.8Pressure Connection ......................................................................... 10
7.9Error and System Messages .............................................................. 11
8.Maintenance ............................................................................................... 12
8.1Battery Operation ............................................................................... 12
9.Technical Information .................................................................................. 12
10.Order Codes ............................................................................................... 14
10.1Accessories ....................................................................................... 15
11.EU Declaration of Conformance ................................................................. 16
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com

HND-P121/-123/-126/-127/-129
HND-P121-129 K04/1121 page 3
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The instruction manuals on our website www.kobold.com are always for currently
manufactured version of our products. Due to technical changes, the instruction
manuals available online may not always correspond to the product version you
have purchased. If you need an instruction manual that corresponds to the
purchased product version, you can request it from us free of charge by email
([email protected]) in PDF format, specifying the relevant invoice number and
serial number. If you wish, the operating instructions can also be sent to you by
post in paper form against an applicable postage fee.
The devices are only to be used, maintained and serviced by persons familiar
with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.
When used in machines, the measuring unit should be used only when the
machines fulfil the EC-machine guidelines.
3. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
The standard delivery includes:
 Hand held Pressure Measuring Devices with Integrated Pressure Sensors
Model: HND-P121/-P123/-P126/-P127/-P129
4. Regulation Use
Any use of the device which exceeds the manufacturer’s specification may
invalidate its warranty. Therefore, any resulting damage is not the responsibility of
the manufacturer. The user assumes all risk for such usage.

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page 4 HND-P121-129 K04/1121
5. Operating Principle
Nearly all measuring tasks for the determination of pressure can be performed
with the HND-P series KOBOLD hand-held pressure measuring devices. Various
housing designs make it possible to find the right housing with the appropriate
characteristic for every application. In addition to the large selection of external
pressure sensors up to max. 400 bar absolute, measuring devices with integrated
sensors in the millibar range are also available.
6. Electrical Connection
6.1 Mains Operation with Power Supply
Warning: When using a power supply please note that operating
voltage has to be 10.5 to 12 VDC. Do not apply overvoltage!! Cheap
12 V-power supplies often have excessive no-load voltage. We,
therefore, recommend using regulated voltage power supplies.
Trouble-free operation is guaranteed by our power supply HND-
Z002.
Prior to connecting the power supply to the mains makes sure
that the operating voltage stated at the power supply is identical
to the mains voltage.

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HND-P121-129 K04/1121 page 5
7. Operation / Configuration / Adjustments
7.1 General
7.1.1 Safety Requirements
This device has been designed and tested in accordance with the safety
regulations for electronic devices.
However, its trouble-free operation and reliability cannot be guaranteed unless
the standard safety measures and special safety advises given in this manual will
be adhered to when using the device.
1. Trouble-free operation and reliability of the device can only be guaranteed if
the device is not subjected to any other climatic conditions than those stated
under 9 Technical Information.
2. Device and sensors have to be handled with care (don’t throw, hit, etc.).
Protect plugs and sockets from soiling.
3. If the device is transported from a cold to a warm environment condensation
may cause in a failure of the function. In such a case make sure the device
temperature has adjusted to the ambient temperature before trying a new
start-up.
4. If device is to be connected to other devices (e.g. via serial interface) the
circuitry has to be designed most carefully. Internal connection in third party
devices (e.g. connection GND and earth) may result in not-permissible
voltages impairing or destroying the device or another device connected.
Warning: If device is operated with a defective mains power
supply (e.g. short circuit from mains voltage to output voltage)
this may result in hazardous voltages at the device (e.g. at sensor
socket or interface).
5. If there is a risk whatsoever involved in running it, the device has to be
switched off immediately and to be marked accordingly to avoid re-starting.
Operator safety may be a risk if:
 there is visible damage to the device
 the device is not working as specified
 the device has been stored under unsuitable conditions for a
longer period of time.
In case of doubt, please return device to manufacturer for repair or maintenance.

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7.1.2 Display
7.1.3 Basic Operation
Please Note: Activating/deactivating tara clears the max- & min-
memories.
1) Zero-Point Adjustment: If there is no pressure or zero-pressure (absolute)
applied to the pressure ports the device will display 0. If there is a permanent
deviation (and device is operated under steady conditions), a permanent zero
point adjustment can be carried out. To carry out the adjustment press button 3
for approx. 5 seconds (Auto Null will be displayed shortly). The adjustment is
done via the OFFSET-value of the sensor (referring configuration menu).
To recall the manufacturer’s calibration press button 3 for approx. 15 seconds.

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HND-P121-129 K04/1121 page 7
7.1.4 Connections
Connection for pressure tube
Interface: Connection for el. isolated interface adapter (p.r.t.
chapter 7.5 The Serial Interface)
The mains adapter socket is located at the left side of the device.
7.2 Pop-up clip
Handling:
 Pull at label “open” in order to swing open the pop-up clip.
 Pull at label “open” again to swing open the pop-up clip further.
Function:
 The device with a closed pop-up clip can be plainly laid onto a table or
attached to a belt, etc.
 The device with pop-up clip at position 90° can be set up on a table, etc.
 The device with pop-up clip at position 180° can be suspended from a
screw or the magnetic holder.

HND-P121/-123/-126/-127/-129
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7.3 Calibration Services
Calibration certificates – DKD-certificates – other certificates:
If device should be certificated for its accuracy, it is the best solution to return it
with the referring sensors to the manufacturer.
Only the manufacturer is capable to do efficient recalibration if necessary to get
results of highest accuracy!
7.4 Configuration
To change device settings, press Menu (key 4) for 2 seconds. This will call the
configuration menu.
Pressing key Menu jumps between the parameters.
The parameters can be changed with  (key 2) or  (key 5).
Quit (key 6) finishes the configuration and returns to standard measuring
operation.
Parameter
V
alue Description
‚Menu‘ ▲ o
r
▼
mbar, bar, … Unit: Unit of display
oFF/on Sea-Level: Sea level correction: on or off
(only available at HND-P129)
-2000 … 9999 Altitude: Input of altitude above sea level [m],
only if SL=on
(only available at HND-P129)
1…120
A
uto Power-Of
f
time in minutes
oFF Auto Power-Off deactivated
0,1, 11…91 Base adress of interface
OFFS refer to list
below The offset of sensor will be displaced by this value to compensate for deviations in the
probe or in the measurin
g
device.
oFF Zero displacement inactive
(
=0.00
)
SCAL -2.000 …
2.000
The measuring scale of sensor will be
changed by this factor [%] to compensate
deviations of temperature probe or measuring
device.
oFF Scale correction factor inactive
(
=0.000
)

HND-P121/-123/-126/-127/-129
HND-P121-129 K04/1121 page 9
Device t
y
pe ad
j
ustable offset
HND-P121 -5.00…5.00 mba
r
HND-P123 -50.0…50.0 mba
r
HND-P127 -50.0…50.0 mba
r
HND-P126 -500…500 mba
r
HND-P129 -500…500 mba
r
7.4.1 Sea Level Correction for Absolute Pressure Sensors (HND-P129)
The device displays the absolute pressure measured at the sensor. This is not
necessarily the same like the values given by weather stations! The weather
stations‘ values are pressure at sea level. Usually, the sensor is placed above
sea level and therefore, if the value at sea level (zero) is to be measured, the
pressure loss resulting from the actual level above zero has to be considered! To
correct the measuring display, activate the “Sea-Level-Function” (SL, p.r.t.
chapter 7.4).
If the sea level correction is active this will be shown by the functional arrow „SL“
in the display, the device now displays the absolute pressure at sea level (zero).
7.4.2 Power off Time
The device will be automatically switched off if no key is pressed/no interface
communication takes place for the time of the power off time.
It can be completely deactivated by setting the parameter to ‚P.oFF = oFF“.
7.5 The Serial Interface
By means of the serial interface and a suitable electrically isolated interface
adapter HND-Z031, HND-Z032 (accessories) the device can be connected to a
computer for data transfer.
To avoid transmission errors, there are several security checks implemented e.g.
CRC.
The following standard software packages are available:
BUS-S20M: 20-channel software to display the measuring values
Note: The measuring and display range values read back from the
interface are always in the selected measurement unit (mbar,
bar...)!

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Supported functions:
7.6 Zero Displacement Sensor ('OFFS')
A zero displacement can be carried out for the measured value:
value displayed = value measured - offset
Standard setting: 'off' = 0.0°, i.e. no zero displacement will be carried out.
Together with the scale correction (see below) this factor is mainly used to
compensate for sensor deviations. Input is in the display unit.
7.7 Scale Correction Sensor ('SCAL')
The scale of the measuring can be influenced by this setting (factor is in %):
displayed value = measured value * (1+Scal/100)
Standard setting: 'off' =0.000, i.e. value is not corrected. Together with the zero
displacement (see above) this factor is mainly used to compensate for sensor
deviations.
7.8 Pressure Connection
2 (or 1) universal pressure connector for 6 x 1 mm (4 mm tube inner diameter) or
8 x 1 mm (6 mm tube inner diameter) plastic tubes.
7.8.1 Device type with absolute pressure (HND-P129)
Connect plastic tube to pressure port.
Code Name/Function Code Name/Function
0 Read measurement value 200 Read min display range
3 Read system state 201 Read max display range
6 Read min memory 202 Read display range - unit
7 Read max memory 204 Read display range – decimal point
12 Read ID number 208 Read # of channels
32 Read configuration flag
BitCorrectToSealevel:32
214 Read scale adjustment [%]
216 Read offset adjustment
160 Set configuration flag (see above) 220 Read altitude (only abs. press sensors)
174 Clear min memory 221 Set altitude (only abs. press sensors)
175 Clear max memory 222 Read power off time (Conf-P.oFF)
176 Read min measuring range 223 Set power off time (Conf-P.oFF)
177 Read max measuring range 240 Reset
178 Read measuring range – measuring unit 254 Program version
179 Read measuring range – decimal point
180 Read kind of measuring of sensor
199 Read kind of measuring of display

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HND-P121-129 K04/1121 page 11
7.8.2 Device type with relative pressure
 For measurements of overpressure (refer to summary):
Connect plastic tube to pressure port "+". Port "-" will not be used!
 For measurements of under pressure (refer to summary):
Plug the tube to pressure port "-". The measuring range covers then up to
max. overpressure range
Note: All values are displayed now as positive values. No minus sign will be
shown. Example: it is possible to measure under pressure down to
-25.00 mbar, the display shows then the value 25.00 (no minus sign).
 For measurements of pressure differences:
Connect both plastic tubes to pressure port "+" and "-"; make sure to apply
higher pressure to port "+".
Measure ranges:
Device t
y
pe Over- or under pressure Under pressure
HND-P121 -1.00…25.00 mba
r
-25.00…0.00 mba
r
HND-P123 -10.0…350.0 mba
r
-350.0…0.0 mba
r
HND-P127 -10.0…420.0 mba
r
-420.0…0.0 mba
r
HND-P126 -100…2000 mba
r
-2000…0 mba
r
7.9 Error and System Messages
Display Meaning What to do?
Low battery power, device will only continue
operation for a short period of time
Replace battery
Battery empty Replace battery
Mains operation without battery: wrong voltage Check power supply, replace it when
necessar
y
No display or
confused
characters,
device does
not react on
keypress
Battery empty Replace battery
Mains operation without battery: wrong voltage or
polarit
y
Check power supply, replace it when
necessar
y
System error Disconnect battery and power supplies, wait
shortl
y
, then reconnec
t
Device defective Return to manufacturer for repair
Err.1 Measured value above allowable range Check: pressure above 1300 mbar?
-> measurin
g
value to hi
g
h
Sensor defective Return to manufacturer for repair
Err.2 Measured value below allowable ran
g
e -> measurin
g
value to low
Sensor defective Return to manufacturer for repair
Err.
4
Value is too low to be displayed, tara is set Check: display below -2000 (tara?)?
Err.9 Measured value far out of allowable range Check: pressure not within sensor range?
Err.7 System error Return to manufacturer for repair

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8. Maintenance
8.1 Battery Operation
If ´bAt´ is shown in the secondary display the battery has been used up and
needs to be replaced. The device will, however, operate correctly for a certain
amount of time. If ´bAt´ is shown in the upper display the voltage is too low to
operate the device; the battery has been completely used up.
Please note: We recommend taking out battery if device is not
used for a longer period of time!
9. Technical Information
HND-P121:
Measuring range: -1.00...25.00 mbar
Accuracy: ±0.3 % F.S.
(hysteresis and linearity)
±0.4 % F.S.
(temperature dependency 0...50 °C)
Resolution: 1 Pa (0.01 mbar)
Pressure units: mbar, bar, Pa, kPa, MPa, mmHg, PSI, m H2O
(display “m”)
Overload: max. 100 mbar
HND-P123:
Measuring range: -10.0...350.0 mbar
Accuracy: ±0.2 % F.S.
(hysteresis and linearity)
±0.4 % F.S.
(temperature dependency 0...50 °C)
Resolution: 0.01 mbar
Pressure units: mbar, bar, kPa, MPa, mmHg, PSI, m H2O
(display “m”)
Overload: max. 1 bar
HND-P127:
Measuring range: -10.0...420.0 mbar
Accuracy: ±0.1 % F.S.
(hysteresis and linearity)
±0.4 % F.S.
(temperature dependency 0...50 °C)
Resolution: 0.1 mbar
Pressure units: mbar, bar, kPa, MPa, mmHg, PSI, m H2O
(display “m”)
Overload: max. 1 bar

HND-P121/-123/-126/-127/-129
HND-P121-129 K04/1121 page 13
HND-P126:
Measuring range: -100...2000 mbar
Accuracy: ±0.2 % F.S.
(hysteresis and linearity)
±0.4 % F.S.
(temperature dependency 0...50 °C)
Resolution: 0.1 mbar
Pressure units: mbar, bar, kPa, MPa, mmHg, PSI, m H2O
(display “m”)
Overload: max. 4 bar
HND-P129:
Measuring range: 0...1300 mbar abs.
Accuracy: ±0.2 % F.S.
(hysteresis and linearity)
±0.4 % F.S.
(temperature dependency 0...50 °C)
Resolution: 1 Pa (0.01 mbar)
Pressure units: mbar, bar, Pa, kPa, MPa, mmHg, PSI, m H2O
(display “m”)
Overload: max. 4 bar abs.
Measuring input: by means of a metal-hose stems
Sensor: piezo-resistive absolute pressure sensor,
for air or non-corrosive and
non-ionising gases and liquids,
not for water!
Display: 2 x 4 ½ digit LC-displays
Operating temperature: 0…+50 °C
Storage temperature: -20…+70 °C
Relative humidity: 0...95 % r.H. (non-condensing)
Output: serial interface
(via 3.5 mm jack, transformer on
RS232 or USB optional)
Power supply: 9V-monobloc battery
(included in the scope of delivery),
extern 10.5...12 VDC via jack
Current consumption: ~0.6 mA
Materials: housing made of impact-resistant ABS plastic
Protection: IP 65, front side
Dimensions: 142 x 71 x 26 mm (L x W x D)
Weight: approx. 165g

HND-P121/-123/-126/-127/-129
page 14 HND-P121-129 K04/1121
Scope of functions:
 Min-/Max-value memory
 Hold function: »freezing« of the current value
 Automatic-off function: 1...120 min (can be deactivated)
 Zero point adjustment via keyboard possible
 Tare function: Display, minimum/maximum values are set to zero
 Battery change notification
10. Order Codes
Order-No. Housing design
HND-P121 2 measuring inputs, standard
HND-P123 2 measuring inputs, standard
HND-P126 2 measuring inputs, standard
HND-P127 2 measuring inputs, greater sensor accuracy,
standard
HND-P129 1x pressure sensor input, standard

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10.1 Accessories
Order-no. Description
HND-Z002 Plug power supply unit (220/240 V, 50/60 Hz), 10.5 V/10 mA
HND-Z011 Equipment protective housing bag, nappa leather, with 1 cut-out for round
sensor connection
HND-Z012 Equipment protective housing bag, nappa leather, with 2 cut-outs for round
sensor connection
HND-Z021* Case with recess (275 x 229 x 83 mm)
HND-Z022* Universal case with egg crate foam (275 x 229 x 83 mm)
HND-Z023* Large case with recess (394 x 294 x 106 mm)
HND-Z031 Interface converter on RS232, galvanically isolated
HND-Z032 Interface converter on USB, galvanically isolated
HND-Z033 Adapter RS232 converter on USB- interface
HND-Z034 Windows software for setting and data read- and print-out of instruments of the
HND- series with logger function
BUS-S20M Software for recording measuring data on a PC for 20 modules, for devices of
the HND-series without logging function
HND-Z081 Double nozzle for hose 6/4 on hose 6/4
HND-Z082 Hose clamp for hose 6/4
HND-Z083 Adapter made of brass for G 1/4 internal threads on hose 6/4
HND-Z084 PVC-hose (5 bar), 6 mm external / 4 mm internal
HND-Z085 PE-hose (10 bar), 6 mm external / 4 mm internal
HND-Z086 PU-hose (9 bar), 6 mm external / 4 mm internal
HND-Z087 PA-hose (25 bar), 6 mm external / 4 mm internal
* observe instrument dimensions
Additional accessories on request

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11. EU Declaration of Conformance
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Hand held Pressure Measuring Devices with Integrated Pressure Sensors
Model: HND-P121/-P123/-P126/P127/-P129
to which this declaration relates is in conformity with the standards noted below:
EN 61326-1:2013
Electrical equipment for measurement, control and laboratory use - EMC
requirements - Part 1: General requirements
EN IEC 63000:2018
Technische Dokumentation zur Beurteilung von Elektro- und Elektronikgeräten
hinsichtlich der Beschränkung gefährlicher Stoffe
Also, the following EU guidelines are fulfilled:
2014/30/EU Electromagnetic compatibility
2011/65/EU RoHS (Kategorie 9)
2015/863/EU Delegierte Richtlinie (RoHS III)
Hofheim, den 23. Nov. 2021
H. Volz M. Wenzel
Geschäftsführer Prokurist