Answer / larry gremillion

To set the zero trim for K-TEK (a member of the ABB group) Foundation Fieldbus level devices:

1. In the Transducer Block enter the following – exactly as typed – into the CONFIG_ACCESS field:
KTEKFACTORY
Write the change to the device. This will change the GENERAL_STATUS field to ‘Access Factory’ before changes can be made and saved.

2. Move the float on the probe to the lowest position. This point is TRIM_POINT_LO.

3. Set the CONFIG_VALUE to the level value (in inches) of the lowest float position (typically 0”). In the CONFIG_METHOD field of the transducer block select TRIM_POINT_LO from the pull-down menu. Write the changes to the device. When the value in the TRIM_COUNT_LO field changes to match the value in the SENSOR_RAW_LEVEL_1 field the change has been saved.

4. Exit ‘Factory Access’ mode by typing a minus sign into the CONFIG_ACCESS field and write to the device, or by cycling power to the device. This completes the sensor trim procedure for K-TEK Foundation Fieldbus level transmitters.

7. Manually copy all settings and values from SENSOR_RANGE in the Transducer Block to the XD_SCALE in the AI Block (CH 1). When these data are written to the device they will automatically be copied into the relevant parameters in the Transducer Block.

I hope this helps!

Answer / ram nath singh

first I will go to (Hart application-on line application-device setup-diag/ service-calibration-sencer trim) I can choos zero trim for T Tx.

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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =

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