Optional Transmitter Configuration

Table 6-3Effect of flow direction on totalizers and digital communications

 

 

Forward flow(1)

Flow direction value

Flow totals

Flow values via digital comm.

 

 

 

Forward

Increase

Positive

 

 

 

Reverse

No change

Positive

 

 

 

Bidirectional

Increase

Positive

 

 

 

Absolute value

Increase

Positive(2)

 

 

 

Negate Forward

No change

Negative

 

 

 

Negate Bidirectional

Decrease

Negative

 

 

 

 

 

Zero flow

 

 

 

Flow direction value

Flow totals

Flow values via digital comm.

 

 

 

All

No change

0

 

 

 

 

 

Reverse flow(3)

 

 

 

Flow direction value

Flow totals

Flow values via digital comm.

 

 

 

Forward

No change

Negative

 

 

 

Reverse

Increase

Negative

 

 

 

Bidirectional

Decrease

Negative

 

 

 

Absolute value

Increase

Positive(2)

 

 

 

Negate Forward

Increase

Positive

 

 

 

Negate Bidirectional

Increase

Positive

 

 

 

(1)Process fluid flowing in same direction as flow direction arrow on sensor.

(2)Refer to the digital communications status bits for an indication of whether flow is positive or negative.

(3)Process fluid flowing in opposite direction from flow direction arrow on sensor.

6.9Configuring events

An event occurs if the real-time value of a user-specified process variable varies beyond a user-specified value. Events are used to perform specific actions on the transmitter. For example, the event can be defined to activate a discrete output if the flow rate is above a specified value. The discrete output, then, may be configured to close a valve.

Note: Events cannot be used to manage the filling process.

You can define one or two events. You may define the events on a single process variable or on two different process variables. Each event is associated with either a high or a low alarm.

Configuring an event includes the following steps:

1.Selecting Event 1 or Event 2.

2.Assigning a process variable to the event.

3.Specifying the Event Type:

Active High – alarm is triggered if process variable goes above setpoint

Active Low – alarm is triggered if process variable goes below setpoint

Using the Transmitter

Optional Configuration

Filler Configuration

Using the Filler

Configuration and Use Manual

45

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Emerson Process Management 1500 manual Configuring events, Zero flow

1500 specifications

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