Varec 4532 - Manual (Page 11)

Varec, Inc. 1
4532 Introduction
1 Introduction
1.1 Introduction
The 4532 Average Temperature Sensor and Converter (ATC) is a multi-element (Pt100)
resistance device designed to measure the average product temperature in bulk liquid
storage tanks. The measured value is converted into a HART® compatible output for use
in temperature compensated volumetric calculations. The 4532 ATC contains up to 6
temperature elements, spaced at 2 or 3 meter intervals along the length of the probe.
Power and local HART communications are provided over a 2-wire, intrinsically safe (i.s.)
connection from compatible instruments, such as the Varec 6000 Series Servo Tank
Gauge (STG), 7500 Series Radar Tank Gauges (RTG) and the 4590 Tank Side Monitor
(TSM).
1.2 Installation and operation overview
Step 1. Installing on tank top
•
The actual installation may require an installer to work in a hazardous area. Safety
must be taken into account in order to avoid any harmful conditions.
•
The installation method depends on the type of 4532 ATC. Refer to
Chapter 4, Installation.
Step 2. Wiring to the host instruments (4590 TSM)
•
Wiring material and conditions must be in accordance with intrinsically safe
standards.
•
One end (normally on the host instrument side) of the shield twisted pair of cables
must be grounded at the terminal connection.
•
Refer to Chapter 4, Installation.
Step 3. 4532 ATC initial setup
•
Set up device settings for the 4532 ATC and the local HART setting to the host
instrument.
Step 4. Data flow from the 4532 ATC to the host instruments
•
Individual element temperature data: Individual row element temperature can be
accessed regardless of liquid level information on the 4532 ATC's data matrix.
Average temperature data: The host instrument sends liquid level data on the HART line
to the 4532 ATC. The 4532 ATC calculates both Gas / Liquid phase average temperature
based on this given liquid level.
1.3 Software history
Software version /
Date
Software changes Documentation
changes
V1.45/04.2006 Original software