Metrohm 773 pH/mV Simulator - Manual (Page 13)

3.1 Technical data
773 pH/mV Simulator
11
3 Appendix
3.1 Technical data
Simulated pH values
Range........................................................................................................ pH = 0...20
Divisions......................................................................................................... ∆pH = 1
Temperatures for pH compensation .............................. 0, 20, 25, 40, 60, 80, 100 ° C
Simulated potential values
Range
Divisions
U = 0...20 mV ∆U = 1 mV
U = 0...200 mV ∆U = 10 mV
U = 0...2000 mV ∆U = 100 mV
Turn-on transient
1...10 minutes after switch-on: typically 25 x 10 -6
Influence of ambient temperature
Range
Typically
U = ±0...20 mV 100 x 10 -6 /K
U = ±0...200 mV 20 x 10 -6 /K
U = ±0...2000 mV 15 x 10 -6 /K
Longterm stability (2 years)
Voltage source (pH/mV) .................................................................................. < 0.3 ‰
Resistance for temperature check ..................................................................... < 2 ‰
Source resistances
at U = 0 mV or pH = 7...................................................................................... < 1 Ω
Ri = 1000 MΩ ± 20 %
Ri ∼ 0.002 MΩ between -20 ... +20 mV............................................max. 2.2 kΩ
-200 ... +200 mV..........................................max. 1.8 kΩ
-2000 ... +2000 mV.........................................max. 600 Ω
Power supply
4 Mignon 1.5V-LR6 batteries; 2200 mAh
Working life 1-2 years
Automatic switch-off after 50 minutes
In order to avoid incorrect measurements resulting from exhausted batteries the
pH/mV Simulator switches itself off when the voltage is insufficient.
Ambient temperature
Nominal working range ............................................................................. 0...+50 ° C
Storage and transport............................................................................. -40...+70 ° C
General construction
Safety specifications according to IEC 1010/EN61010-1, class 3
IP 40
Dimensions
Width
225 mm
Height 90 mm
Depth 95 mm
Weight .......................................................................................................................1.5 kg