3-26
Chapter 3 Starting and Stopping this Device
3-3-2 Liquid Level Measurement
(1) Preparing for Operation
(i) Important points
Warning
When clearing vents and drains, check the direction in which material will come out in
order to avoid any contact with the human body. There is a danger of scalding and other
harmful health effects. If the process fluid is harmful to the human body, take safety
measures such as wearing goggles or a mask so that it does not adhere to the skin or the
eyes, become inhaled, etc.
Caution
Check that the process is in manual control mode. If it is in automatic control mode, be
sure to switch it to manual control mode before starting work.
In terms of piping, before commencing operation of this device as shown below, check
that the master valves, manual master valve, drain valves, drain plugs (see Figure 2-39)
are closed.
(ii) Calculating the setting range
To find the setting range based on calculation, see section 3-10.
(iii) Zero point checking and calibration
Procedure
(1) Open the drain plugs, and open the pressure-receiving part to the atmosphere. At this time, if fluid
remains in the pressure-receiving part, remove it, being careful not to damage the diaphragm.
(2) Using the communicator, check the device output. If the output is not zero, calibrate the zero
point. For information regarding the zero point calibration procedure, see the operation manual
for the communicator.
(3) After finishing calibration and checking, close the drain plugs.
(iv) Cautions regarding the absolute pressure gauge
The JTA model is an absolute pressure gauge. Do not perform zero point adjustment. If it is
necessary to adjust the zero point on an absolute pressure gauge, please contact us.
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