Chapter 2. Installing the DewPro MMR101
10
DewPro MMR101 User’s Manual
2.3.5
Preparation
Use the steps below to make electrical connections to the instrument.
CAUTION!
Make sure that the voltage between the + and - terminals lies between 12 and 28 V DC.
1.
Unscrew the lateral connection cover and remove from the housing.
2.
Loosen the lateral cable gland.
Note:
If you are using a cable conduit, remove the cable gland and replace with the corresponding M20
½
" NPT
adapter.
3.
Feed the cable through the cable opening. Use a shielded 4-wire cable with an outside diameter of 5 mm or
greater.
4.
Make connection to the terminal block as shown in
on the next page. Connect the cable as follows:
Note:
The moisture signal output must always be connected; connecting the temperature signal output is
optional. If the signal output for temperature is not needed, the corresponding terminals should not be used.
5.
In order to meet EMI/RFI immunity, a 2- or 4-wire shielded cable with a common foil shield layer is being used to
power the MMR101. Removing the insulation by 3” allows the user to pull back the foil, clamping it in between the
metal cable gland. The ground wire must be connected to the internal grounding screw. This way the MMR101
meets EMC requirements according to IEC 61326, Criterion A (see details under Chapter 6, Specifications.).
6.
Tighten the cable gland to assure protection type IP 67 and to provide strain relief for the cable.
Table 2:
Position
Signal
1
Tempe
2
Temperature -
3
Mo
4
Moisture -
5
External Earth Ground
6
Internal Earth Ground
1 2 3 4 5 6
