1. GENERAL DESCRIPTION
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WARNING: Never install a fuse rated more than 800mA
The DRA-RTM-8 is a multiplexer for 16 analog inputs - eight of which, marked
1-8, are direct inputs for Pt-100 sensors, while the remaining (9-16), are for 4-
20mA current loops.
The DRA-RTM-8 output format is a 4-20mA current loop, with a 28mA limitation.
Each Pt-100 input has its own signal conditioner, allowing each input to be
calibrated separately. Each signal conditioner includes six DIP switches for coarse
calibration and two potentiometers for fine tuning.
2. MOUNTING INSTRUCTIONS
The DRA-RTM-8 is designed for standard DIN rail mounting.
Place the unit on the upper part of the mounting rail with the fastening tab facing
down. Using a suitable flat screwdriver loosen the tab slightly and attach the unit
to the rail. Once the tab is loosened, ensure that the unit is fastened securely in
place.
3. REPLACING FUSES
To replace a blown fuse, disassemble the unit as follows:
a. Take off both terminal strips by removing the four screws at the edges.
Note: This does not require disconnecting the cables connected to the strips.
b. Remove the front panel using a suitable flat screwdriver. Press down gently on
the plastic springloaded tabs located in the slots on either side of the unit.
c. Disconnect the flat connectors which connects the front panel printed circuit.
d. Replace the blown fuse.
4. ASSEMBLY
The DRA-RTM-8 unit includes two printed circuit cards designated as P.N 7020
and P.N 7021. The two printed circuit cards should occupy the slots in the
enclosure according to fig 1.
