Azbil JTD720A, User Manual, Page: 45 / 76

Azbil Corporation Starting and Stopping this Device
Model JTD720A - Smart Multivariable Transmitter 3-11
3-3 : Measurement
3-3-1 : Flow Rate 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, the differential pressure outlet valves (master valves), drain
valves, gas vent plugs (see Figures 2-30 and 2-31) and the stop valve of
the three-way manifold valve must be closed on both the high pressure
and low pressure sides. In addition, check that the equalizer valve of the
three-way manifold valve is open.
(ii) Introducing process pressure and checking for leaks
In the following procedure, process pressure is introduced into the pressure-receiving part of
this device.
◆ Procedure ◆
(1) Open the high and low pressure side master valves (see Figures 2-30 and 2-31), and
introduce process fluid into the connecting pipe. If the process temperature is high at
this point, wait until the connecting pipe cools down.
(2) Fill the pressure-receiving part of the device with process fluid.
(1) Gradually open the stop valve on the high pressure side. When it is filled
with process fluid, close the valve.