1. Technical Specifications
Measuring ranges:
pH
-2.00 to 19.99
mV
± 2000
Temp
-20 to 150 °C (-4 to 302 °F)
Resolution
pH
0.1/0.01/0.001
mV
0.1/1
Temp
0.1 °C (0.1 °F)
Measuring error
(± 1 digit)
pH
0.002
mV
0.2
Temp
0.2 °C ( 0.4 °F)
Reproducibility
(± 1 digit)
pH
± 0.001
mV
± 0.1
Temp
± 0.1 °C (± 0.1 °F)
Automatic temperature compensation
Manual entrance.
With Pt 1000 temperature probe (A.T.C.).
With NTC 10 K probe.
Isopotential pH programmable, standard value 7.00.
pH calibration
With 1, 2 or 3 buffers selectable inside the range.
Automatic recognition of technical and DIN 19266 buffers and
up to 3 user’s buffers.
Calibration at any pH value (indirect calibration).
Theoretical calibration.
Manual introduction of the calibration parameters.
Programmable calibration validity between 0 h and 7 days.
Automatic recalibration warning.
Automatic rejection of electrodes in poor conditions.
pH calibration criteria
Asymmetry potential ± 58 mV.
Slope 41 to 62 mV/pH, at 25°C (77 °F) (sensitivity 70 to 105 %).
mV calibration
Automatic recognition of redox standard 220 mV at 25°C
(77 °F).
Calibration at any mV value.
Manual introduction of the calibration parameters.
Temperature readjustment
Correction of the temp. probe deviation (A.T.C.) at 25 °C (77 °F)
and 85 °C (185 °F).
Measuring mode
By stability (selectable stability criteria).
Continuous.
By time.
Data Logger
Storage capacity up to 340 readings, by channel.
Storage the last 9 pH calibrations.
Languages
English, German, Spanish, French, Italian, Portuguese.
Display
Graphic, backlit liquid crystal, 128 x 64 dots.
Inputs and outputs
Combined or indicator electrode, BNC connector (Imp. >10
12
).
.
Reference electrode, banana connector.
A.T.C. type Pt 1000, banana or telephonic connector.
Stirrer, RCA connector.
RS232C for printer or PC, telephonic connector.
External PC key board, mini DIN connector.
Ambient conditions
Working temperature 5 to 40 °C (41 to 104 °F).
Storage temperature -15 to 65 °C (5 to 149 °F).
Relative humidity < 80% (not condensed).
Power supply
External plug-in power supply 100-240 VAC 0.4 A 47-63 Hz.
Materials
Enclosure, ABS and PC. Keypad, PET with protective treatment.
Physical parameters
Weight: 1100 g.
Size: 350 x 200 x 110 mm.
2
PH31 HACH_LANGE 0710.indd ANG:2
PH31 HACH_LANGE 0710.indd ANG:2
8/7/10 16:44:48
8/7/10 16:44:48
