BlueTree 5000 Betriebsanweisung PDF herunterladen (Seite 47)

11.8.5 Connecting an analog gauge or source (4-20mA) to the

modem’s analog input:

Figure 28

Follow the above diagram to convert a 4-20mA source into a 0-5Vdc input to the modem’s

analog input (ADC). 249 and 255 ohms are standard values for a 1% resistor.

Readings:

• At 20mA, the modem reads around 5V on the analog pin

• At 4mA, the modem reads around 1V

• When the current loop is missing, the modem reads 0V

11.9 Mounting the modem

The modem requires four #4 screws (3/16”) pan or fillister head, as well as corresponding lock

washers.

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BlueTree 5000 Betriebsanweisung Seite 47