Sensaphone IMS-4000 Users manual - Manual (Page 121)

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Chapter 7: IMS-4000 Sensors
iMs-4851 4–20Ma briDGe
introduction
The IMS-4000 4–20mA Bridge allows you to connect a 4–20mA transducer to your IMS-4000 Host or Node. The 4–20mA
Bridge features optical isolation between the input and the IMS-4000, which ensures trouble-free operation and safety. The
electrical connection between the bridge and IMS-4000 is made via RJ-45 patch cable (not included). The bridge may be
mounted either on a wall or rest on the floor.
package Contents
(1) IMS-4851 4–20mA Bridge
(2) Plastic drywall anchors
(2) #6 Metal tapping screws
(4) Rubber feet
wiring the Transducer
Connect your 4-20mA transducer to the terminal block labeled Input as shown in the figure below. Insert 1/2" stripped bare
wire into the slot and tighten the screw. The Current Flow light will glow steadily when current is flowing into the bridge
from the transducer. Note that a 4-20mA transducer typically requires you to have an external DC power supply for the
transducer. A 24VDC supply is available from Sensaphone (FGD-0053).
Figure 1: 4–20mA transducer wiring to IMS-4851 Terminal Block
Cabling
The 4-20mA Bridge connects to the IMS-4000 Host or Node via an RJ-45 cable (e.g. CAT5 cable). The connection from the
sensor to the Host or Node can utilize your existing network wiring infrastructure. For example, the bridge may be installed
in another room or another floor. Connect the bridge to your structured wiring network via an RJ-45 jack. At the other end,
connect a patch cable from your structured wiring patch panel directly to the Host or Node environment input.
Figure 2: Connections to the IMS-4851
Caution: The IMS sensors are not TCP/IP devices and therefore should not be connected directly to any wiring
infrastructure that is connected to network equipment such as a hub, router, or switch. Sensors use RJ-45 plugs
and cables similar to those used with Ethernet devices.