The Clark Reliance Corporation
16633 Foltz Industrial Parkway | Strongsville, OH 44149 | Tel1 (440) 572-1500 Facsimile: +1 (440)-238-8828
Email:
| Web Site:
www.clark-reliance.com
6. MAINTENANCE
Magnicator II liquid level gauges use magnetostrictive technology and only have one moving part—the float. This
technology ensures no scheduled maintenance or re-calibration is required.
6.1 Removal of Electronic Puck
The MTII4200 gauge is designed so that the user may remove the electronics module for any reason, including repair or
upgrading of the module. Use the instructions below to remove the MTII4200 electronics module.
1. Remove power from gauge.
2. Remove cover from explosion-proof housing enclosure.
3. Gently pull out the electronic puck by raising equally on all sides of the round puck. Do not twist.
4. Pull electronic puck completely free of connector pins and spacer on block cover.
6.2 Installation of Electronic Puck
Use the instructions below to install the MTII4200 electronics module.
1. Remove power from gauge.
2. Remove cover from explosion-proof housing enclosure.
3. Place electronics puck on top of mating connector pins (2 places) and spacer, and gently press down on puck.
4. Press down on puck until connection is made completely.
5. Install cover of enclosure before applying power.
7. ADJUSTMENTS FOR MTII4200 TRANSMITTERS (via HART)
Refer to the documentation supplied with your specific HART software package or hand held communicator for details on
performing sensor calibration. This section describes how the HART protocol is applied to the MTII4200 level transmitter
only.
Using the HART interface allows for calibration without having to remove the transmitter from the process and position the
floats. The HART commands 35 and 65 are implemented for this function.
Any measured output may be assigned to any variable. Loop #1 is always the primary variable (P.V.); normally level one
is assigned to loop #1.
Calibration set points for level one are given as the absolute displacement (in the appropriate units) from the tip of the
sensor. For example, if the desired ZERO position for level one is given as 5 inches, the MTII4200 will produce 4 mA
when the float is 5 inches from the tip of the transmitter. If the desired SPAN position for level one is given as 30 inches,
the MTII4200 will produce 20 mA when the float is 35 inches from the tip of the transmitter.
7.1 HART Quick Start
The MTII4200 transmitter can be re-calibrated using a Rosemount model 275 hand held terminal. Follow the simple
instructions below to reset the low and high values for loop #1. Only loop #1 can be calibrated with the HART terminal.
RULES:
1. Be sure the MTII4200 is connected 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 as applicable for working on live equipment in a hazardous location. When safety is
secured, remove housing cover.
4. Connect the HART communicator to the HART terminals labeled “HART” on the front panel display of the MTII4200
gauge.
