User guide

Multi Process Meter Instruction Manual
12
Isolated 4-20 mA Transmitter Output
OUTPUT
SOURCE
Process variable (PV), max, min, set points 1-8, Modbus
input, or manual control mode.
SCALING RANGE 1.000 to 23.000 mA for any display range.
CALIBRATION Factory calibrated: 4.000 to 20.000 = 4-20 mA output.
ANALOG OUT
PROGRAMMING
23.000 mA maximum for all parameters:
Overrange, underrange, max, min, and break.
ACCURACY ± 0.1% of span ± 0.004 mA.
TEMPERATURE
DRIFT
0.4 µA/C max from 0 to 65C ambient,
0.8 µA/C max from -40 to 0C ambient.
Note: Analog output drift is separate from input drift.
ISOLATED
TRANSMITTER
POWER SUPPLY
Terminals I+ & R: 24 VDC  10%. May be used to power the
4-20 mA output or other devices. Refer to Figure 5 on page
17 and Figure 16 on page 23.
All models rated @ 40 mA max.
EXTERNAL LOOP
POWER SUPPLY
35 VDC maximum.
OUTPUT LOOP
RESISTANCE
Power supply Minimum Maximum
24 VDC 10  700 
35 VDC (external) 100  1200 
Modbus
®
RTU Serial Communications
SLAVE ID 1 – 247 (Meter address).
BAUD RATE 300 – 19,200 bps.
TRANSMIT
TIME DELAY
Programmable between 0 and 199 ms.
DATA 8 bit (1 start bit, 1 or 2 stop bits).
PARITY Even, Odd, or None with 1 or 2 stop bits.
BYTE-TO-BYTE
TIMEOUT
0.01 – 2.54 second.
TURN AROUND
DELAY
Less than 2 ms (fixed).
Note: Refer to the Modbus Register Tables located at www.dwyer-inst.com for
details.