Varec 4000 - Manual (Page 20)

Installation Tank Gauge Transmitter
10 Installation and Operations Manual
2.5 Connecting the RTD
The following list shows how the ATT is wired to an RTD device. The ATT’s temperature circuit is designed to work
with a platinum or copper 3-wire RTD.
2.5.1 Connecting the Handheld Terminal
Figure 2-3 on page 6 shows how the 1200 Hand Held Terminal is connected to the ATTI bus on the ATT. The Model
268 can also be used to configure the ATT.
Warning! The 1200 Hand Held Terminal on the ATT is not Intrinsically Safe. Care must be taken to only use in a non-hazardous
environment
Wire as follows:
•
Connect the RTD's A terminal to the ATT's terminal 6, A.
•
Connect the RTD's B terminal to the ATT's terminal 5, C.
•
Connect the RTD's C terminal to the ATT's terminal 4, C.
2.5.2 Wiring Completion
Caution! Do not overtighten metal plugs used to seal wiring compartment ports. Overtightening may damage the housing.
Properly seal the 1/2-inch NPT conduit entry. Install cover and tighten to ensure that the O-ring seal is adequately
compressed. Proper sealing of all ports is necessary to prevent moisture or other contamination from entering the
wiring compartment.
2.5.3 Installation Checkout
After a thorough check that all connections are correctly made and that all covers and plugs are installed, turn on
power to the ATT. Proceed to Chapter 3, Configuration.
2.5.4 Installation Checklist
The steps required in the installation process are summarized in the following checklist. Since each step is detailed
specifically with accompanying notes, cautions, and warnings, be sure to refer to the sub-sections indicated for further
information.
Step Sub-Section(s) Reference
Unpack the ATT and check the packing list. Unpacking
Verify that the required input power is available. Mounting the ATT, Wiring
Mount the ATT. Mounting the Equipment
Ground the ATT. Grounding the Equipment
Route the conduit between the ATT and other
devices and seal all ports.
Wiring Completion
Wire the host communications. Connecting Host Communication
Wire the RTD Connecting the RTD
Wire the input power connections. Connecting Input Power
Apply power to the ATT. Installation Checkout
Wire the Model 1200 Handheld Terminal Connecting Handheld Terminal
Proceed to ATT configuration procedure. ATT Configuration (Section 3)