3
Signet 9950 Conductivity Transmiter
●
Minimize handling of the plug-in modules to reduce the
possibility of damage due to ESD.
●
Handle modules by the edges.
Never touch any exposed circuitry or contacts.
●
Wear an anti-static wristband or stand on an anti-static mat,
or keep one hand touching a properly grounded pipe or other
piece of properly grounded metal when handling modules.
CAUTION
Avoid Electrostatic Discharge (ESD).
NOTE:
• The four red Indicator LEDs on the front panel of the 9950
show the status of relays
1, 2, 3, & 4. The LEDs will activate with or without a relay
module installed.
• Hysteresis and time delay are adjustable for each relay.
• Dry-contact relays are electromechanical switches with
a moving contact armature. They are suitable for many
general-purpose applications, AC or DC, including AC
loads up to 250 V.
• Solid-state relays are electronic switches with no moving
parts. They may be used with AC or DC loads, but have
lower current handling capability and voltage ratings than
Dry-contact relays. Solid-state relays will outlast Dry-
contact relays in pulsing applications. 30 VDC/ VAC
maximum.
• The four Binary Inputs can detect if an external sensor
or switch is open or closed. The switch state can be used
to control the relays in the module. The four binary inputs
only control relay activation and are not considered an
input measurement.
For wiring information, refer to the Relay Wiring section,
page 8.
Switching active loads (usually inductive) can cause
contact arcing suf
fi
cient to damage the relays.
The RC Filter Kit or “snubber” (part number
3-8050.396) is available as an accessory to reduce
or eliminate these damaging effects. Recommended
for inductive loads greater than 50 VAC (remote
relays, solenoids, pumps, etc.)
CAUTION
The 3-9950.393-3 module can be set to supply power
to the external switch/sensor. For switches/sensors that
require power set the Int/Ext switch to the Int positions.
If the external Switches/Sensors are powered set the
Int/Ext switch to Ext. Important for externally powered
switches/sensors ensure the output signal is within the
allowable range for the 3-9950.393-3.
3-9950.393-3
Keep relay wiring separate from sensor
and signal wiring to prevent interference
and damage to the 9950 Transmitter.
CAUTION
Int / Ext
Switch
EXT
INT
Optional modules and accessories are available for the 9950:
a.
Base Unit (required)
b.
Slot for Conductivity Resistivity Module
c.
Slot for optional Loop Output Module
d.
Slot for optional Relay Module
Plug-In Modules
a.
b .
c .
Mfr. Part No.
Code
Description
3-9950.394-1
159 001 894
Single Channel Direct
Conductivity Resistivity Module
3-9950.398-2
159 001 848
Dual Channel 4 to 20 mA
Current Loop Output Module
Conductivity and Loop Modules
Direct Conductivity Resistivity Module
Compatible with all GF Signet Conductivity Electrodes.
Maximum Conductivity cable length is 30 meters (100 feet).
For longer distances use the 3-2850 Conductivity Sensor
Electronics. Up to two modules can be installed in a
9950 Transmitter
Dual Channel 4 to 20 mA Module
Two additional 4 to 20 mA passive current loop outputs in a
single module, allows up to six current loop modules in the
9950 Transmitter.
d.
