Panametrics DewPro MMR101, Руководство пользователя

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Chapter 2. Installing the DewPro MMR101
12 DewPro MMR101 User’s Manual
2.3.7 System Configuration with One 24 VDC Power Supply and Loop Powered Display
When making electrical connection for power and the display you should adhere to the following guidelines:
• The voltage between the + and - terminals must not drop below 12 V DC.
• Every component connected to the loop causes a voltage drop. To determine the supply voltage required, add
up the voltage drops of the components connected to the loop and add 12 V. This sum is the required minimum
voltage. A safety margin of 20% should added into the calculated.
• For precision measurement, make sure that both loops are connected to the power supply at the power supply,
do not use a jumper at the transmitter terminals.
• Adapt the external display to the following measuring ranges based on the 4 to 20 mA current range:
• 0 to 100% relative humidity
• -40 to 100
o
C dew point
(up to 150
o
C for pressurized systems)
• -40 to 212
o
F dew point
(up to 300
o
F for pressurized systems)
• 0 to 1000 g/m
3
absolute humidity
• 0 to 1000 g/kg mixing ratio
• 0 to 100% by volume
• -40 to 212
o
F wet bulb temperature
Use the Figure 6, below to make moisture and temperature connections using one or two 24 VDC power supplies.
Figure 6: Connection with One 24 VDC Power Supply
12...28 VDC