6
Signet 9900 Conductivity Transmitter
The 9900 requires regulated
10.8 to 35.2 VDC (24 VDC nominal)
from an external power supply (not supplied).
Maximum current draw is:
200 mA
= 9900 without Relay module
300 mA
= 9900 with Relay module
Terminal Identifi cation
Terminals 1-2: DC Power
Required by the instrument
●
10.8 to 35.2 VDC input power to sensors, relays and the LCD
backlight
Terminals 3-4: Loop Power (may also be used for system power)
●
10.8 to 35.2 VDC
NOTE:
Backlight, LEDs, Modbus and optional Relay Module do
not operate on loop power. Any connected sensors or sensor
electronics that cannot operate on loop power will also be
inoperative.
Terminals 5-6: Open Collector
●
Software selectable for Normally Open or Normally Closed.
●
May be disabled (Off) if not used.
Terminals 7-10: Digital (S
3
L)/Frequency Input
7: V+: +5 VDC out to sensor (black wire)
8: DATA: Input signal from sensor (red wire)
9: GND: Sensor ground (white wire)
10: SHLD: Cable shield
10
9
7 8
V+
DA
T
A
GND
SHLD
Digital (S
3
L)/Freq
1
2
3
4
5
6
PWR+
PWR–
Loop+
Loop–
OC-
OC+
Power
