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Model TS420
Quick Start Guide
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Intrinsically Safe Barriers
In order for the TS420 to be used with classified equipment inside of the hazardous area, it is
necessary for the customer to purchase either a Galvanic or Zener Diode Barrier, which should
be mounted in the non-classified area between the TS420 and the facilities’ control room. A list
of recommended manufacturers and part numbers follows for galvanic barriers:
Stahl - 9303/11-22-11 Elcon - mD323 or mD325
MTL - MTL7206 or MTL5041 Turck - mk33-Li-ExO
Pepperl+Fuchs - KFD2-CR-EX1.30-300
These are recommended active type barriers for intrinsically safe applications. Each application
is different and it is the ultimate decision of the user to determine the appropriate I/S barrier for
their application.
NOTE - To maintain intrinsic safety, wire length and gauge are limited by the capacitance and
inductance of the wire, C
i
and L
i
of the TS420, and the barrier ratings. See Section 5.1.5 for
instructions on calculating these values.
Align the TS420 so that the LCD display is easily viewed. Teflon tape may be used on the
TS420’s threads.
The two wires at the base of the TS420 provide a 4-20mA loop-powered output. The red wire
is the “loop +” lead and the white wire is the “loop -” lead (Figure Q-B). A third green/yellow
wire is provided for frame ground.
Figure Q-B Wiring Diagram
It is recommended that a two wire, shielded cable be used for making power and output signal
connections on the TS420.
Connect the green/yellow frame ground wire to the grounding terminal or lug inside the junction
box being used with the TS420.
Ensure the junction box frame is connected to frame ground or connected to the cable shield,
which is connected to frame ground at the controller.
Connect the red wire to the +24VDC terminal. Connect the white wire to the signal input
terminal on the readout/relay display module, FMD Field Mounted Display, S4100E smart
sensor, industrial analog to digital converter, computer-based monitor, PLC, DCS, etc.
Since the TS420 is designed to operate continuously, a power switch is not included, in order to
prevent accidental system shutdown.
LOOP - (WHITE)
CONTROL
ROOM
LOOP + (RED)
JUNCTION BOX
RED
WHITE
GRN/YEL
TS420