Operation; Control Logic; Sequence Of Operation; Starting And Stopping The Sampler Controller - Sentry P2B-ATEX Installation & Operation Manual

Operation

Control Logic

The manual sampler controller included with the sampler is designed to operate the sampler . The control logic
includes:
1. Cycle time: Determines the duration between samples .
2. Sample time: Determines the duration the sample probe is extended into the process . Setting this timer allows the
anulus to fill properly .
3. Manual Sample (HAND): Allows the operator to immediately collect a sample .
4. Automatic Sample (AUTO): Allows the operator to initiate continuous sampling .
5. Auto light: Indicates sampler is currently sampling or is ready for a remote start signal .
6. Batch Complete light: Indicates batch counter has reached the set number .

Sequence of Operation

The sampler controller can operate in manual (HAND) or automatic (AUTO) mode .
When the selector switch is held in the HAND position:
ƒ The sampler solenoid is energized .
ƒ The sampler solenoid stays energized until the switch is released and it returns to the OFF position .
When the sampler controller is placed in AUTO mode a sample is taken immediately:
ƒ The sample timer (TDR 113) starts, the Extend solenoid is energized, the air cylinder extends the sample tube, and a
sample is taken .
ƒ When the sample timer expires, the Extend solenoid is de-energized and the air cylinder retracts the sample tube
and the Retract timer (TDR 115) is activated .
ƒ When the Retract timer expires, the Extend timer resets and the sample cycle starts again . Sampling continues until
the sampler controller is turned OFF or the batch count is met .

Starting and Stopping the Sampler Controller

Before operating the sampler controller, set the timers to the desired values .
Timers
Set the Extend timer (TDR 113) and Retract timer (TDR 115) by turning the dials to the appropriate time intervals .
ƒ When the timers are set, make sure the selector switch is in the OFF position before applying power to the sampler
controller .
ƒ TDR 113 is typically set to 5 seconds .
ƒ TDR 115 is set at the time required between samples .
ƒ TDR 104 should be set to 0 .
Sentry P2B-ATEX Controller 7