General Description - Sentry AutoVREL Installation, Operation And Maintenance Manual

General Description

Flow control of water and steam sampling is important to help assure representative
sampling, quality of the samples and, repeatability of the analytical results. During plant
cycling, constant flow in the sample line minimizes the chance of altering the chemistry
of the samples of high purity water through entrapment and/or release of soluble species
from deposits in the system. Sample inlet temperature and flow are easily controlled
under base load conditions. However, since sample pressures typically fluctuate during
varying load conditions, maintaining a representative sample can be difficult and labor
intensive. The traditional manual sample conditioning system can require constant
adjustment during startup or as plant conditions change. The Sentry® AutoVREL Flow
Controller is designed to meet requirements for representative sampling by maintaining
a constant flow rate with varying inlet conditions. Automated flow control is achieved by
continuously monitoring the sample flow rate and controlling a Sentry VREL® valve. This
helps to avoid nuisance analyzer alarms and continual operator intervention.
 NOTE
The Sentry AutoVREL flow controller is designed to be used in conjunction with the Sentry TSV
(thermal shut-off valve) with alarm switch .
6 Sentry Equipment Corp