Bronkhorst®
Instruction Manual ES-FLOW™ 1xxC
9.17.153A
16
5
Operation
5.1
Powering up
To maintain control of the fluid system and ensure a safe situation, it is recommended to turn on power before applying
fluid pressure and to switch off power only after the fluid system is depressurized.
When applying pressure, avoid pressure shocks and bring the fluid system gradually up to the level of the required
operating conditions; open the fluid supply gently.
·
After powering up, the instrument needs a couple of seconds to start up the electronics and perform a self-test. After
successful initialization, the green LED will light up continuously to indicate that the instrument is ready to use.
·
If the sensor tube contains gas, the red LED will light up continuously and the instrument will issue a warning code by
means of parameter
Alarm Info
(see
).
5.2
First use
Bronkhorst does the utmost to ensure that you receive a clean product. This does not, however, relieve the end user of the
responsibility to ensure that the instrument and the system in which it is incorporated meet the requirements implied by
the intended use of the instrument. The responsibility for cleaning the equipment to meet such requirements lies exclusively
with the end user.
Before starting measurement and control, make sure to remove gas from the fluid system by flushing all fluid lines with the
process fluid at a high flow rate.
5.3
Powering down
·
Prior to powering down the ES-FLOW™, the fluid system should be depressurized.
·
When depressurizing, prevent sudden pressure changes by shutting off the fluid supply gradually.
5.4
Control valve
This section is only applicable if the ES-FLOW™ is used in conjunction with a control valve.
5.4.1
Bleeding
In order to ensure stable and reliable control behavior, the dead space of the control valve should be kept free of gas, by
bleeding it from time to time. Bleeding is advised at the following occasions:
·
prior to first use
·
when restarting the instrument after purging
·
periodically, to remove accumulated gas
·
Make sure to connect the bleed outlet to an appropriate draining facility, especially if the system is used to process
hazardous media.
·
Take appropriate safety measures, as described in the Material Safety Data Sheet(s) of the media to be processed (if
applicable).
Install a shut-off valve as close to the bleed outlet as possible and connect a clear transparent tube to the valve outlet; being
able to see gas bubbles in the liquid will ease monitoring the progress of the bleeding procedure
To bleed the control valve, follow this procedure:
1. Change the liquid flow setpoint to 0% (this closes the valve)
2. Pressurize the liquid inlet (if not already done so)
3. Open the bleed outlet (slowly) until liquid starts to escape
4. Optionally, tap the valve assembly and/or liquid inlet of the valve to let gas bubbles accumulate and migrate to the
valve
5. Close the bleed outlet as soon as all gas has escaped the control valve
