K-Patents PR-01-S - Manual (Page 91)

INSTRUCTION MANUAL FOR K-PATENTS PR-01-S (-AX/FM/CS) DOCUMENT/REVISION No. INM 1/14
Effective: May 15, 2009
89
10. ACCESSORY UNITS
Accessory units provided for K-Patents Process Refractometer PR-01-S.
10.1. EXTERNAL OUTPUT UNIT PR-7090
The K-Patents Process Refractometer can be provided with a separate current output unit to give
e.g. a temperature mA signal.
Cable fittings:
The cable fittings are delivered as one of two alternatives:
US: ½ NPT-TYPE ST-1 conduit hubs
European: BF11/PG11 cable glands or
M20x1,5 metric cable glands
Note: Seal all unused fittings with blind washers.
The dimensions are the same as for the Relay unit, see Figure 9.01.
The mA output specifications are the same as for the built-in mA output of the Indicating transmitter, see
Section 2.2.
Two monitoring LEDs are on the circuit card, Figure 10.10:
a. The green LED L1 is lit if the processor on the card works correctly.
b. The red LED L2 is lit if correct input data are missing.
Connections
The External output unit is connected to the serial bus, see Figure 3.63 and Figure 10.10. Note the 120
Ohm closing resistor in Figure 3.62.
The output mA signal is connected to the terminals 42+ and 43-, see Figure 10.10.
Configuration
To program the External output unit from the keyboard of the Indicating transmitter, start with the
sequence Calibrate/Parameters/Output signals/External output.
1. Zero = measurement value corresponding to 4 mA.
2. Span = measurement value span corresponding to mA output span.
3. Hold function: Can be selected active or inactive.
4. Range: Select 4 - 20 mA or 0 - 20 mA
5. Source: Select one of following alternatives
– Not defined
– CONC (RI)
– Standard RI (25 °C)
– Temp °C
– Temp °F
Example: For source °C, zero = 20, span = 80 the output signal 4 - 20 mA corresponds to 20 - 100 °C.