Yokogawa EXA ISC202 2-wire Conductivity Transmitter/Analyzer - Manuel (Page 60)

12. Test Certificate
Test EXA Series
Certificate Model ISC202
Inductive Conductivity Transmitter
1. Introduction
This inspection procedure applies to the model ISC202 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:
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.
Next the (+) plus, the (-) minus and terminals 12, 14,16 and 17 linked together. A load of 500VAC is
placed over the interconnected terminals and the ground. During 10 seconds it is checked if the leak
current is equal or less than 15 mA.
4.1 Accuracy Testing
Our automated testing facility checks the resistivity input accuracy of the instrument using a
calibrated ISC40 sensor and a variable resistor (decade resistor box).
4.2.1 Accuracy Testing of the Pt1000
Our automated testing facility checks the input accuracy of the instrument using a calibrated variable
resistor (decade resistor box) to simulate the resistance of the Pt1000.
4.2.2 Accuracy Testing of the 30k NTC
Our automated testing facility checks the input accuracy of the instrument using a calibrated variable
resistor (decade resistor box) to simulate the resistance of the 30k NTC.
025
F70.00
Unique Number
Line Number
ATE (automatic test equipment no.)
Month code
Year code
12-1 Test Certificate
IM 12D8B3-F-E