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INVUE GV148 LIQUID CHEMICAL CONCENTRATION MONITOR
User Guide | Entegris, Inc.
CAUTION: All grounds (power supply ground,
comms ground, digital IO ground, the three
analog grounds) are individually unique. Do
not short grounds together.
CAUTION: If the power supply and serial comms
grounds become common and >+15 VDC is applied
to the serial communication Transmit/Receive (TX/
X) pins, irreversible damage to the unit may occur.
1. Connect the power [A] and ground [B]
2. Connect the digital IO power [H] and digital IO
ground [N]
NOTE: Digital IO usage is optional. Digital IO is used
for re-zero command, temperature compensation
selection, and alarm notification. To reduce signal
noise, ground separately from power supply ground.
3. Connect digital inputs and outputs for re-zero
command [L], temperature compensation selection
[M], and alarm detection [I].
– Digital inputs [L and M] are optically isolated,
sinking inputs (pull signal to digital IO ground to
energize)
– Digital outputs [I and K} are optically isolated,
open collector, 80 mAdc maximum (output pulls
load to digital IO ground when energized)
4. Connect analog outputs and grounds for reading of
concentration [O and P], fluid temperature [R and
S], and refractive index [T and U]
CAUTION: 4 – 20 mAdc analog outputs are self
powered. Analog outputs are always on. Isolate
all unused connections.
NOTE: Analog output usage is optional. Analog out-
puts are used for analog data logging of refractive
indexes, concentration, and sensor fluid temperatures.
To reduce signal noise, ground separately from power
supply ground.
5. Connect serial communications
NOTE: GV148 HMI software is required to fully utilize
the features of the GV148 monitor. Configure the
serial interface for RS422 or RS485 to use the GV148
HMI software.
– RS422 serial communication requires a 4-wire
connection [C, D, F, and G]
– RS485 serial communication requires a 2-wire
connection [C and D together, F and G together]
NOTE: To reduce signal noise, usage of the Comms Ground
[E] is recommended, but not made common to the power
supply ground.
