- Datalogging
CLEAR/ZERO = Zero setting
PRINT/HOLD = Print and freeze display
START/STOP = Data recording / printing
SET= Select config. modes
SELECT= Select config. data
c Matrix display
d Connection for pneumatic hoses
e Connection for plug-in power supply unit
f Connection for RS 232 interface
d
c
e
f
Important!
Please note warning symbol
in the operating instructions.
Copyright (c) by LOVE CONTROLS.
The contents of this publication may not be
copied without the express permission of
LOVE CONTROLS.
Subject to dimension and design changes.
3
1Description
The „LOVE CONTROLS“ handheld pressure
gauge HM28 is a digital pressure measuring
instrument with integrated pressure sensor
for the measurement of differential, relative or
absolute pressures and vacuum. Its versatile
range of functions and high precision makes
it suitable for a wide range of applications.
Configuration possibilities:
•Autom. switching off, selectable time
•Selectable resolution and damping
•Selectable units of time
•Selectable measurement units
•General reset to standard setting
•Selectable data transfer rate
•Configuration printout
•Selectable measuring intervals
2Safety details
Switching off Press the OFF key, or auto-
matic switching off 1,10 or 60
min after the last keystroke.
In case of a temperature change the instrument
requires at least 30 minutes to adjust to the
new ambient temperature.
3.2 Pneumatic connection
For measuring ranges up to 7000 mbar, 4/6
mm or NPT 1/8" connectors can be connected
depending on model. Higher ranges are
equipped with NPT 1/8".
Ensure correct connection of the pneumatic
hoses!
+Phigh pressure
S-low pressure(not available
with the absolute and relative
pressure version)
The pressure values stated on the rating plate
and mentioned in these operating instructions
must not be exceeded otherwise the pressure
sensor can be destroyed.
Do not use the instrument in danger
zones (explosives zones)!
Wear eye protection for pressures > 1bar!
3Operating
3.1 Switching on and off
Switching on Press the ON key (the maxi-
mum permissible measuring
range and the class appears
on the display).
For precision measurements
the instrument must be switched on for at least 1 minute
(warm-up phase).
Measuring negative differential or relative
pressures:
connect “S-”
or
change ports “S-“ and “+P”.
The HM28 will display a positive value.
3.3 Operating modes
The modes in the matrix below can be selected
in succession by pressing the MODE key.
After switching ON, the instrument is alwaysin the mode „normal“.
4
Î negative pressure,
When screwing on a coupling it
is important to hold with a spanner in the opposite direction.
Never hold at case only!
Switching on
Normal
(differential)
and
analogue/hold
Normal
(absolute)
and differential
Zoom
Min/Max
Leak rate
Tendency
(absolute)
Record 1)
Print Record
print
hold
print
print
print
print
print
start/stop
print
quick keystroke:
max. output speed
Keystroke
approx.1s:
single or fast
output start/stop
printing
zero
display
zero
diff
zero
display
zero
(reset)
zero
display
clear
memory
Display example
Max. Range:
200 mbar
Full scale error
0.05 %
123.45 mbar
====== or
HLD123.4 mbar
1013.2 mbar
DIF1013.2 mbar
123.45
MAX150.0 mbar
MIN100.0 mbar
1234.5 mbar
LEK2.1 /min
1013.2 mbar
TND- 15.7 /min
REC432.1 mbar
STOP 30 s MEM 1
REC432.1 mbar
RUN30 s MEM 321
432.1 mbar
STOP 30 s MEM 901
PRINT RECORD
PUSH PRINT
PRT432.1 mbar
32100:13:30
PRT
Record stopped
Notes
Measuring range
displayed in desired
unit
Accuracy class as a %
of full scale reading
Only with differential
or relative pressure
models
Hold, store indicated
value
Only with absolute
pressure mode Zero
sets Diff to 0
Measurement in large
figures
With absolute pressure,
reset to actual value
Only with Diff./Rel.
(unit/time unit)
Only with absolute
pressure (unit/time unit)
If measurement
memory cleared
Recording runs up to
964 values
Recording stopped
Appears only if values
are stored
Printing / display with
time
Recording stopped
1) at 70 bar the measurements are stored in [bar]
5
3.4 Configuration
Select mode:
Press >2 seconds
Store and exit:
Press >2 seconds
Î on the display appears
CONFIGURATION
Î on the display appears
SAVE CONFIGURATION
set unitmbar, kPa, bar, 2)
mmH2O, mH2O,
mmHg, psi, inH2O,
inHg, hPa, Pa, MPa
sethigh
resolution1)low
set dampingoff
on
set baudrate9600, 4800, 2400,
1200
set auto-off1, 10, 60 min
continuouscontinue
set time unitminutes
hourshours
set1, 5, 10, 20, 30, 60 s
Rec. interval2, 3, 5, 10, 30, 60 min
DAMPING90% recovery after 4
offmeasurements (when ON)
BAUDRATE
9600
AUTO OFFAutomatic switching off or
10 mincontinuous mode
TIME UNITFor leak rate, tendency
minutes
REC INTERVALOff = record mode is
5 s (1.3h)deactivated
(max. record interval)
DISPLAY RATENormal mode indication/zoom
2.5 Hz (400 ms)(influences DAMPING)
Notes
general reset? set on default valueszero
printprint now
configuration?
1) If changed, the measurement memory is cleared 2) See in 4.1 "Technical data"
GENERAL RESET? Reset all settings and clear
PUSH ZEROmeasurement memory
GENERAL RESET? After actuating ZERO
RESET OK
PRINT CONFIG?Unit, ...
PUSH PRINT
PRINT CONFIG?After actuating PRINT
PRINTING
6
3.5 RS 232 mode
The HM28 can be remotely operated from a
personal computer via an RS 232 interface.
The automatic switching off (chapter 3.1) is
inactive. Connection by means of a RS232cable.
Plug pin assignment RS 232, DB 9 (female)
The answer is terminated with a CR
- The checksum is formed from the least
significant byte of the command string
relative overpressure and negative
pressure. The instrument is calibrated
from 0 to100% of the measuring
range. Exceeding or underrunning this
range by up to about 10% is still
displayed.
Differential pressure sensors (d)
))
)
))
doesn’t measure the same value on
the P and S side mandatorily because
of her geometry.
O
2
O
2
4.3 Power supply unit connection
The HM28 can be operated by a regulated
plug-in power supply unit.
Input115V, 60 Hz
Output9 V DC ± 20 %, 100 mA
(7 to 14 V DC)
5Maintenance
The HM28 requires no maintenance. It can be
cleaned with a damp cloth. Do not use cleaning
agents containing solvents!
See the relevant chapters for battery change
and recalibration.
12
6Warning messages and faults
Fault/indicationPossible causeRemedy
ERROR
OUT OF RANGE
CHANGE BATTERY
No change in
measurement
Does not switch on
Instrument
inaccurate
10% exceeding or underrunning of measuring range
Battery voltage too low
Over pressure applied to
pressuresensor
No power supply
Inaccurate recalibration
Not zeroed
Natural aging of the pressure
sensor
7Accessories
Standard 1 9 V block battery
1 operating instructions
OptionPlug-in power supply unit
115V, 60Hz
Leather case with carrying strap
Service set
Hand pump with variobellows5bar
Handpump 20 bar
SCS test certificate
Adapter RS232 9M-25F
Adapter NPT1/8"
Communication SW package
comprising:
- RS232-IF cable (9 pole fem.)
- Communication-software for
MS Windows
- Measurement places
management software for
MS Windows
Apply permissible measuring
pressure
Insert new battery
Dispatch instrument for repair
Fit new battery as required
Battery possibly not correctly inserted
Plug in power supply unit correctly
Repeat recalibration
Vent and actuate zero
Carry out recalibration
13
8Calibration instructions
Recalibration to be carried out by
specially skilled staff only!
Actuate the following key combinations:
• First press MODE and keep it
pressed
• Next and additionally, press CLEAR/
ZERO and keep pressed until
CALIBRATION is displayed
Exit from this mode is possible at any time via
MODE or OFF.
The instrument must be in operation for at
least 30 minutes (warm up stabilization time).
New calibration values are only stored
when all five setpoints have been
running through correctly and
Calibration at 22 °C (71,6 °F) environmental temperature
An incorrect internal instrument temperature can lead to accuracy fluctuations!
The pressure set points have to be set in
[mbar]!
Check the instrument accuracy after
recalibration!
acceptable values acquired. In the
event of a maloperation, the calibration
process is interrupted and the previous
calibration data are retained.
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14
LOVE CONTROLS Division
Dwyer Instruments, Inc.
Highway 212 AT 12
Michigan City, IN 46360
USA
Phone ++1 219 879 8868
Fax++1 219 872 9057
I-HM28/0501, Art. Nr. 70 792 146 Printed in Switzerland
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