Specification:
|
|
|
Meas. ranges: |
Conductivity: 0.0... 200,0 µS/cm
0... 2000 µS/cm
0.00... 20.00 mS/cm
0.0... 200.0 mS/cm
manual setting or auto range
Temperature:
(GMH3410):
0.0... +85.0°C
(GMH3430): -5.0... +100.0°C
Resistance: (GMH3430) 0.005 ... 100.0 kOhm
Salinity: (GMH3430) 0.0 ... 70.0
TDS: (GMH3430) 0 ... 1999 mg/l
|
|
Resolution: |
0.1 µS/cm; 1 µS/cm 10 µS/cm bzw.
0.1mS/cm
0.1 °C
0.001 kOhm; 0.01 kOhm or 0.1 kOhm
0.1 (salinity)
1 mg/l
|
|
Accuracy: |
+ 1 digit at nominal
temperature
Conductivity: ±0.5% of meas. value ±0.3% FS
Temperature: ±0,2% of meas. value ±0.3K
|
|
Cell constant:
|
adjustable 0.8 ... 1.2 cm-1
|
|
Temperature compensation: |
automatic or
off (GMH3430).
|
|
Compensation coeffizient: |
- nLF: not linear function of
natural water according to EN27888 (DIN38404)
- Lin: Linear compensation from
0.3 ... 3.0 %/K. (GMH3430 only)
- off: no compensation
(GMH3430 only)
|
|
Display:
|
2 four-digit LCD-displays (12.4mm
and 7mm high)
for conductivity (resistance, salinity, TDS) and temperatue,
min./max values,
hold function, etc. as well as additional functional arrows.
|
|
Measuring cell:
|
Two-electrode-conductivity
measuring cell; temperature sensor integrated in shaft.
Electrode material: graphite. The graphite electrodes are the optimum solution for sewage
and can be cleaned easily.
|
|
Working temperature:
|
0 to +50°C
(device)
0 to +80°C (permanent); -5 to +100°C (short-time)
|
|
Relative humidity: |
0 to +95% r.h. (not condensing)
|
|
Storage temperature:
|
-20 to +70°C
|
|
Min-/Max value memory:
|
max. and min. values as well as
the corresponding temperature are memorized. |
|
Hold function: |
By pressing a button the current meas. value and the corresponding temperature will be 'frozen'.
|
|
Push buttons: |
6 membrane keys for ON/OFF-switch,
selection of meas. range, min- and max-value memory,
hold-function, etc.
|
|
Interface: |
serial interface (3.5mm jack
connector), direct connection to RS232 interface of a PC via electrically isolated
interface adapter GRS3100 or to USB-interface by interface adapter USB3100.
|
|
Power supply: |
9V battery, type IEC 6F22 (included) as well as additional d.c. connector (internal pin diameter 1.9 mm) for
external 10-12 V direct voltage
supply (suitable power supply: GNG 10/3000) |
|
Power-Off-function: |
Device will be automatically switched off if no
key is pressed / no interface communication takes
place for the time of the power-off delay. The power-off delay can be set to
values between 1 and 120 min.; it can be completely deactivated.
|
|
Low battery warning: |
'bAt'
|
|
Power consumption: |
approx. 5 mA (meas.
power not incl.)
|
|
Dimensions (device): |
142 x 71 x 26 mm (L x
W x D)
Impact resistant ABS plastic housing,
membrane keyboard, transparent panel.
Front side IP65, integrated pop-up
clip for table top or suspended use.
|
|
Electrode dim: |
approx. 120 mm long,
diameter approx. 12 mm, 1 m of fixed connection cable between electrode and device.
|
|
Weight:
|
approx. 255 g (incl. battery and
measuring cell)
|
|
Automatic temperature compensation: |
The
conductivity is highly dependant on the temperature, i.e. it is only valid for one
temperature.
For better comparison the device offers the possibility to compensate the conductivity to a
reference temperature (25°C, or adjustable for GMH 3430
20°C/25°C).
|
|
Temperature measurement: |
The temperature
of the medium can be displayed by means of the temperature probe integrated in the
electrode.
|
|
AutoRange: |
Automatical selection of the optimum meas. range for
conductivity measurements. AutoRange mode can be deactivated by
pressing a button.
|
|
Salinity-determination: |
(GMH3430 only): Salinity is understood to be
the sum of concentrations of all salts dissolved in water.
Reading in g/kg.
|
|
TDS-determination
(dry residue of filtrate) |
(GMH3430
only): The dry residue of filtrate is
understood to be the concentration of substances dissolved in a liquid. Unit: mg/l.
|
|
|
|
|
|
|
