Calibration Check; Testing Prism Wash; Using The Indicating Transmitter - Vaisala K-PATENTS PR-23 Series Instruction Manual

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6. For a connected sensor, the diagnostic message at start-up should be
or, if the process pipe is empty,
ERATION
"Diagnostic messages table".
7. The TEMP value should show the current process temperature.
8. The value and the correct setup of the two mA output signals can be checked by
selecting
DESCRIPTION
menu (Section 5.3).
9. If internal relays or switch inputs are used, their settings can also be checked
through the Description menu (Section 5.3).

5.1.2 Calibration check

Wait until normal process conditions occur. The concentration reading is precali-
brated at delivery and a copy of the Sensor calibration certificate is inside the Indi-
cating transmitter. If the diagnostic message is
tration reading does not agree with the laboratory results, then consult Section 6.4,
"Calibrating the concentration measurement".

5.1.3 Testing prism wash

1. Check that the steam or water washing parts are connected (Section 4.2.2, "Prism
wash systems").
2. In the Main display, press
). In this Sensor status display by pressing the soft key
TUS
does not appear, no internal relay is configured for this purpose.
3. Check the n reading, for a successful wash it must drop below 1.34 during steam
D
wash and drop to approximately 1.33 during water wash.
Important: Before testing prism wash, check that there is liquid in the pipe in front
of the refractometer sensor.

5.2 Using the Indicating transmitter

The Indicating transmitter DTR receives the refractive index value n
temperature from the sensor(s). Starting from these values, it calculates the concen-
tration of the process media for display and further transmission. The DTR can also
be programmed to give alarm for high or low concentration. If the refractometer has
a prism wash system, the DTR can control the wash with its built-in timer.
For information on how to use the Indicating transmitter DTR for configuration and
calibration, see Chapter 6, "Configuration and calibration".
NO SAMPLE
in the Main menu and then
NORMAL OPERATION
. Then press 3 (to give the command
MENU
PR-23 instruction manual
NORMAL OP-
. Otherwise, see Section 8.4,
in the Description
mA OUTPUTS
but the concen-
SENSOR STA-
. If soft key
WASH
and the process
D
WASH