12 Operation

3.2.2Signal Timeout

The Signal Timeout period defines a time interval which is used to detect if the flow has stopped. If there is no signal input for a time greater than the Signal Timeout period the flow is deemed to have stopped. The Signal Timeout period has two functions:

∙To detect the loss of signal during a batch when the relays are energized. In this case, the Batcher will enter a Flow Alarm condition and de-energize the relays.

∙After the preset batch quantity has been reached and the relays de-energize, some overrun of flow may occur due to slow valve closure, etc. In this case, the Signal Timeout is used to determine when the flow has ceased and thereby accurately determine the amount of overrun.

It is recommended that Signal Timeout periods be kept fairly short, but long enough such that the timeout period is significantly longer than the time period between successive input pulses from the flowmeter at the minimum flowrate.

The instrument enables the user to set a time interval of up to 99 seconds to detect an absence of signal input. If the Signal Timeout is

set to 0, this function is disabled.

Flow Alarm

If a Signal Timeout is set greater than zero and loss of signal is detected during a batch, a Flow Alarm signal is outputted on terminal 7. In addition, both control relays are de-energized. The Flow Alarm output and condition is maintained until acknowledged by pressing the STOP key. The alarm condition is also signaled to the operator by the flashing STOP LED. Once acknowledged, the process can then be reset via the STOP key or continued by pressing the RUN key.

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Epson 214D-1 user manual Signal Timeout, Flow Alarm
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214D-1 specifications

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