Dwyer GFC User Manual
Page 8
Function
0 to 5 VDC
4 to 20 mA
local
remote
2% cutoff on
2% cutoff off
FIGURE 2-b, POTENTIOMETER AND JUMPER LOCATIONS
2.2.1 Valve Control Configuration
There are three basic valve control options. (a) LOCAL or REMOTE control; (b) 0
to 5 VDC or 4 to 20 mA setpoint signal - *note: this only applies for the REMOTE
control configuration; (c) 2% cutoff active or not active. NOTE: 2% cutoff not avail-
able for GFC 57 /67 /77. When active, the 2% cutoff will shut off the power to the
valve when a setpoint of less than 2% of the full scale flow range is set. Figure 2-
2 shows the jumper configurations for the three basic valve control options.
The factory default jumper settings are: LOCAL control, 2% cutoff, and 0 to 5
VDC.
4
NJ1A
2 - 3
1 - 2
NJ1B
5 - 6
4 - 5
NJ1C
8 - 9
7 - 8
NJ1D
11 - 12
10 - 11
NJ1E
13 - 14
14 - 15
FIGURE 2-c, VALVE CONTROL CONFIGURATION JUMPERS
2.2.2 Remote LCD Readouts
GFC Mass Flow Controllers are available with optional remote reading LCD dis-
plays supplied with a three foot long wire to accommodate most applications. This
configuration includes the upper block element which serves as the LCD readout
mounting. Special lengths of remote extension wiring (up to 9.5 feet [3 meters])
are available on request.