Yokogawa EXA SC202 2-Wire Conductivity Transmitter/Analyzer - Manuel (Page 69)

IM 12D7B3-F-E
12-1 Test Certificate
12.1 TEST CERTIFICATE
Test
EXA Series
Certificate
Model SC202
Inductive Conductivity Transmitter
1. Introduction
This inspection procedure applies to the model SC202 Conductivity transmitter. There is a serial
number, unique to the instrument, which is stored in non-volatile memory. Each time the transmitter
is powered up, the serial number is shown in the display. An example is shown below, for details
see the Users manual:
Unique Number
Line Number
ATE (automatic test equipment no.)
Month code
Year code
2. General Inspection
Final testing begins with a visual inspection of the unit to ensure that all the relevant parts are
present and correctly fitted.
3. Safety Test
The (-) minus and the external ground terminal of the housing are connected to a Voltage generator
(100 VDC). The measured impedance value should be over 9.5 MΩ.
Terminal 14 and the external ground terminal of the housing are connected to a Voltage generator
(500 VAC RMS) for 1 minute. The leakage current should remain below 12 mA.
4.1 Accuracy Testing
Our automated testing facility checks the resistivity input accuracy of the instrument using a
calibrated variable resistor (decade resistor box).
4.2 Accuracy Testing of all supported temperature elements
Our automated testing facility checks the input accuracy of the instrument using a calibrated
variable resistor (decade resistor box) to simulate the resistance of all temperature elements.
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