Setup Using Hart Field Communicator; Preparing The Transmitter For Re-Calibration; Setting The Low Value; Setting The Upper Range Value - MTS Systems Level Plus Operation And Installation Manual

Model MR Operation and Installation Manual
Setup

Setup using HART Field Communicator

Refer to the documentation that comes with the Rosemount Model 275 and 375 Field Communicator for specific sensor calibration informa-
tion. This section describes how the HART protocol is applied to the Level Plus Model MR transmitter only.
Using the HART interface allows for calibration without having to remove the transmitter from the process and position of the floats. You can
perform this function by using HART commands 35 and 65.
Any measured output may be assigned to any variable. Loop #1 is always the primary variable (PV); level 1 is usually assigned to loop 1. Loop
2 is always the Second Variable (SV); usually represents temperature or level 2. The Third Variable (TV) and Fourth Variable (FV) may be
assigned to any remaining output such as, level 2, temperature. Analog output codes are 0, 1, and 2 respectively.
Calibration set points for level are given as the absolute displacement (in the appropriate units) from the tip of the sensor pipe. For example, if
the Zero (LRV) position for level 1 is given as 5 inches, the transmitter will produce 4 mA when the float is 5 inches from the tip of the sensor
pipe. If the Span (URV) position for level 1 is given as 30 inches, the transmitter will produce 20 mA when the float is 35 inches from the top
of the sensor pipe. To calibrate the temperature set points, the Zero (LRV) and Span (URV) points are given in degrees. For temperature, the
Zero (LRV) value (in degrees) must always be less than the Span (URV) value (in degrees).

PREPARING THE TRANSMITTER FOR RE-CALIBRATION

The Model MR transmitter can be re-calibrated by using the model 275 and 375 Field Communicator. Complete the following procedure to reset
the zero and span values for loop 1 (only loop 1 can be calibrated with the HART Field Communicator using the generic XMTR type driver. To
access both loops as well as other parameters, the MTS device driver must be purchased and installed in to the 275/375 field communicator.
For more information about the HART device driver, go to HARTcomm.org.
Attention:
DO NOT enter a high value that exceeds the active length of the sensor.
Before you begin, perform the following steps:
1. Connect the transmitter to a clean 24 Vdc power supply. Use a linear supply, switching types do not provide ripple-free power. HART
cannot tolerate more than a 25 mV voltage ripple.
2. If the unit is installed in a live application, place your automatic controllers in manual mode and be advised that the output current will
change during calibration.
3. Follow safe working procedures for working on live equipment in a hazardous location before you remove the housing cover.
4. Connect the HART Field Communicator to the terminals that are labeled HART located on the front panel display of the Level Plus
transmitter.
5. Press the black and white I/O button on the HART terminal. The HART terminal will perform an automatic self test. The Main window
displays. If the device is not connected properly, the message "No device found" displays.
6. In the Main window, press the Key #1, the Device Setup window displays.
7. In the Device setup window, press Key #3. The Basic Setup window displays.
8. In the Basic Setup window, press Key #3. The Range Values window displays.

SETTING THE LOW VALUE

Complete the following steps to set the low value:
1. To set the low value, Process Variable, Low Range Value (PV LRV) to 4 mA, select Key #1. The PV LRV window displays the current low
value. Below the highlighted value located under the current value, key in the low value you want (example 3.00 in. is shown; if 4 inches
is the value you want, key in 4.) then, press Enter (F4) located below the LCD display.
2. To write the changed lower value to memory, press the Send key.
3. Two Warning messages will display before the new values take affect; if your new low values are correct, respond to the Warning
messages by pressing OK when prompted. This action resets the Low Range Value, or 4 mA position into the transmitter's memory.
4. Go back to the Range Values window to verify that the new parameters have been accepted into the transmitter's memory.
5. Do one of the following:
5a. Exit program mode.
5b. To reset the upper value, continue with "Setting the Upper Range Value.

SETTING THE UPPER RANGE VALUE

Complete the following steps to set the Upper Range Value:
Level Plus ® Liquid-Level Transmitters - M-Series Model MR Analog Transmitter
Operation and Installation Manual, Part No.: 550720 Revision K (EN) 02/2016
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MTS Sensors