Yokogawa Advanced Reflux Sampler - Manual (Page 11)

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All Rights Reserved. Copyright © 2011, Yokogawa Electric Corporation. Subject to change without notice. April 2011 IM 11A00V01-01E-A
1. Ensure the installation has been carried out in accordance with the unit requirements and any appropriate regulations/
standards applicable for the site.
2. Turn on instrument air supply and adjust pressure as required. Check for any leaks in the system.
3. Check for any leaks in the process and sample line connection. Rectify Accordingly.
4. Insulate the heat exchanger section, including the top flange assembly and over-temp shut off valve on top of the
heat exchanger.
5. As the system begins to cool down, slowly allow sample flow through the sampler. Increase gradually so that
excessive temperature does not cause the sample over temperature valve to shut-off flow. It may be necessary to
increase the sample flow in gradual steps (1 ltr/min increase every 10 minutes). This will allow the sample to maintain
cooling control on the sample. A sudden step change from 0 to 5 ltr/min may temporarily exceed the cooling capacity
and cause Over Temperature shut-off.
6. After the system has stabilized in temperature, note the sample outlet temperature reading. This should be within +/-
2 o C (+/-6.5 o F) of the desired sample outlet temperature. Adjust outlet temperature at the control dial as required to
reach the desired set-point.
NOTE
Proper insulation of the entire heat exchanger and outlet section will ensure optimal performance and temperature
stability. Failure to do so will result in poor performance and temperature drift due to ambient air temperature fluctuations.
7. OPERATION
During normal operation, the YARS will function automatically.
7.1 Vortex Tubes
Adjustment to the Vortex Tube can be made to vary to temperature of the cooling air provided to the heat exchangers. A
counter-clockwise adjustment of the brass needle valve (recessed in the hot exhaust) will produce colder air, while turning
the needle valve in a clockwise direction produces warmer air.
7.2 Steam Injection
Depending upon the site process conditions, it may or may not become necessary to continuously inject a small volume
of low pressure steam. With the steam supply correctly installed, open the needle valve ½ turn allowing a small volume of
steam in to the sample. Note the sample flowrate after steam injection to be sure that the steam does not over pressure
the sample and interfere with the sample flow. If the ½ turn does not produce sufficient additional reflux action, then adjust
a further ½ turn, again observing the sample flow. This procedure can be carried out several times until correct reflux
action occurs without interfering with sample flow. Note, excessive steam may cause the filter section ,and consequently
the heat exchanger to become too hot, thereby impairing temperature control.
7.3 Controller
The self-acting controller is adjustable. Refer to the attached for additional details.
6. START-UP