wtw PROTOC 200, Operating Manual

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Operation PROTOC 200
4 - 30
4.2 Calibration
The PROTOC 200 is calibrated using two points of its measuring
range: at 0 % and at a value between 50 % and 100 % of the measuring
range. The controller automatically runs through a sequence of zeroing
and calibration operations at preset times over a 24-hour period. How
you can change the time settings is explained in section
5.1 C
ONTROLLER FUNCTION
.
These points can also be checked manually. Carry out the following
steps to do so:
1 Press the ENTER/MENU key. The MAIN MENU appears on
the display.
2 Press F1. The SENSOR SETUP menu appears.
3 Press F3. The NORMAL CAL menu appears.
4 ZERO is highlighted. Press F1. The right display is highlighted.
5 Press the UP key to manually zero the equipment. The control-
ler energizes the zero solenoid.
6 Allow at least 6 to 8 minutes for the system to stabilize.
7 The IR detector current signal appears at the bottom of the dis-
play. The right-hand value is the controller signal in Hertz and
the left-hand value is the corresponding value in ppm. Check
that the ppm value is zero and that the right-hand value is not
less than 250 Hz.
8 Zero the equipment if the ppm value is not zero or if the fre-
quency is less than 250 Hz.
Checking the zero point