Wiring
DensityPRO Wiring Procedures
4-2 DensityPRO Installation Manual Thermo Scientific
DensityPRO
Wiring
Procedures
The steps below provide general instructions for detector-transmitter wiring. For each
cable to be connected, refer to the wiring label on the top of the chassis or to the
wiring installation diagram. You will need a screwdriver with a 1/8-inch blade to
connect the wires to the screw terminal connectors.
1. Ensure all source shutters are in the OFF position.
2. Ensure all power to the gauge is turned off.
3. Remove the housing access cover.
a. For the explosion-proof housing, loosen the screw on the cover-retaining
bracket and slide the bracket off the housing cover. Unscrew the housing
access cover. If necessary, use the two lugs provided on the top of the cover to
aid in removal.
4. Remove the cable conduit plugs from only the holes that will be used. Lay one
conduit for the DC power input and signal cables and, if applicable, a second
conduit for the AC power input and relays. Route the cables into the detector
housing. Leave approximately six inches (150 mm) for strain relief.
5. Connect the cable to the appropriate connector as follows:
a. Remove the screw terminal connector from the on-board connector. If the
connector is tight, brace the board with your hand, taking care not to touch
any circuit components, and remove the screw terminal connector.
b. Loosen the terminal screws on the connector. Insert the wires into the
connector and make connections as shown in the MS2011DUI installation
wiring drawing (p/n 1-0700-038) and as described in the remainder of this
chapter.
c. Tighten the terminal screws to secure the wires. Once all wires are secure,
replace the connector on the board.
6. Connect the ground line of the AC input power to the internal safety ground lug
of the DensityPRO housing.
Caution: When DC input power is used, it is imperative to connect an earth
to either the internal or external safety ground lug of the DensityPRO
housing.
7. Secure the conduit, making sure it is completely sealed.
8. When the wiring is complete, replace the detector housing cover and secure the
cover-retaining bracket.
9. While the mounting hardware of the DensityPRO housing may provide an
adequate earth ground, Thermo Scientific recommends always connecting a true
earth ground to the external safety ground lug of the housing.
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