C200
S
OFTWARE
Instruction Manual C200 Part2 A1.doc
optek Danulat GmbH
•
D-45356 Essen
•
Germany
page 86
6 Calibration
6.1 Calibration
pH
Notes.
•
The analyzer is calibrated by the Company prior to dispatch and the Factory Settings pages are protected by
an access code.
•
Routine recalibration is not necessary – high stability components are used in the analyzer's input circuitry
and, once calibrated, the Analog-to-Digital converter chip self-compensates for zero and span drift. It is
therefore unlikely that the calibration will change over time.
•
Do Not attempt recalibration without first contacting optek.
•
Do Not attempt recalibration unless the input board has been replaced or the Factory Calibration tampered
with.
•
Prior to attempting recalibration, test the analyzer's accuracy using suitably calibrated test equipment – see
Sections 6.1.1 and 6.1.2.
6.1.1 Equipment Required
a) Millivolt source (pH or Redox input simulator): –1000 to 1000 mV.
b) Decade resistance box (Pt100/Pt1000 temperature input simulator): 0 to 10k
Ω
(in increments of 0.01
Ω
), accuracy
±0.1%.
c) Digital milliammeter (current output measurement): 0 to 20mA.
Note.
Resistance boxes have an inherent residual resistance that may range from a few m
Ω
up to 1
Ω
. This value
must be taken into account when simulating input levels, as should the overall tolerance of the resistors within the
boxes.
