IOM006GVAE1103
8
4120
Installation
The Varec Model 4120 Multi-Element Temperature Transmitter is housed in a NEMA 4X
enclosure and is designed to meet FM, CSA, and CENELEC intrinsically safe approvals.
The METT mounts directly to a standard (API 2543) averaging temperature bulb such as
the Varec Model 9909. A junction box is included with terminal connections for the
averaging bulb wires, the Handheld Interface, and the HART bus. The METT provides
galvanic isolation and lightning protection between the HART bus and the temperature
elements. A larger terminal box is included with three terminals for each RTD
(maximum 30).
The ATTI bus version of the METT requires intrinsic safety barriers installed within a
junction box because the ATTI bus is not intrinsically safe.
Figure 1 Typical Model 4120 Installation with Averaging Bulb
Figure 2 Typical Model 4120 Installation with Multiple Spot Bulbs
Model 4110 HART Level Encoder
Model 2500 Tank Gauge
Bottom Weight
Model 9909 Averaging
Temperature Bulb
Model 4120 Multi-Element
Temperature Transmitter
Model 4100/4200
MFT or HIU
Four conductor cable
Mark/Space or EIA485
and DC power
to control room
Two conductor HART cable
intrinsically safe
Model 2500 Tank Gauge
Three conductor RTD cable.
One cable per RTD.
Model 4110
HART Level Encoder
Model 8500
Spot Temperature Bulb
three wire RTD
or equal up to 10 places
Model 4120
Multi-Element Temperature
Transmitter
Two wire HART cable
intrinsically safe
Model 4100
Multifunction Transmitter
Product level
Two inch mounting pipe
SERIAL NO.
MODEL 4120
WHESSOE
VAREC
MULTI-ELEMENT TEMPERATURE
