Instruction manual

Introduction Tank Gauge Transmitter
2 Installation and Operations Manual
1.3 Operation
The ATT uses an incremental counting technique for determining liquid level. An initial
level is identified as part of the calibration procedure. Changes to that level are
determined through incremental increases or decreases detected by the ATT.
The host computer collects measurement information by polling the Advanced
Technology Transmitter over a variety of communication interfaces such as EIA485 and
Mark/Space. Several communication protocols are supported. Among them are Modbus
and Mark/Space.
1.4 Configuration
The Varec Model 1200 Handheld Terminal is used to configure the ATT. It connects to
the same ATTI bus used to interconnect other input/output devices to the ATT. There is
a special connection located inside the junction box for the Handheld Terminal.
1.5 Construction
The Advanced Technology Transmitter is housed within an aluminum enclosure. The
enclosure and assembly meet explosion proof requirements and are environmentally
sealed to prevent internal exposure to contamination.
Figure 1-2: Model 4000 Advanced Technology Transmitter Assembly
7.5 "
(190 mm)
12 "
(308 mm)
8 "
(203 mm)
6.8 "
(172 mm)
4 "
(101 mm)
3.4 "
(86 mm)
3.7 "
(94 mm)