CiDRA SONARtrac PW VF-100 - Manual (Page 4)

20825-01 Rev 07 Page 1-2
The process pressure is reduced to near-atmospheric pressure within
the TAM. This allows dissolved gas within the fluid to come out of
solution. The amount of entrained gas or air within the fluid is then
calculated. Typically, the TAM bolts on to an existing plant I-beam or
process pipe. The TAM is usually connected to an ~1-inch sample tap
and is supplied with about 20
– 30 gpm of process flow. The process
liquid is returned to the process once the measurement is made.
The passive sonar series of process monitors consists of sensor heads
sized for different pipe diameters, each coupled with a size-independent
transmitter.
In addition to models for installations in Ordinary Locations, certain
model numbers of passive sonar meters are available with certifications
for use in Class I, Division 2, Groups A, B, C, and D environments (per
US and Canadian standards). Others are rated for Class I, Zone 2
Group IIB environments (per ATEX Standards). Look for the Hazardous
Area certification markings on the Transmitter and Sensor Head labels
and install in accordance with the corresponding Control Drawing.
This manual covers the basic installation and setup of SONARtrac
®
Process Monitoring Systems. In all cases, local safety and operating
practices take precedence over the information contained within this
document.
The SONAR PROCESS MONITORING SYSTEM SUPPLEMENT FOR
ATEX ZONE 2 SAFETY provides additional information for ATEX Class
I, Zone 2 installations, and takes precedence over this manual.
1.2 Sensor Head Description and Function
The passive sonar sensor head contains no moving parts. The sensor
head includes a sensor band and a fiberglass or stainless steel cover
assembly to protect the sensor band. The sensor band is wrapped
around and clamped onto the process pipe. A multi-conductor cable
electrically connects the sensors to an electronic module mounted in the
cover assembly. Signals from the electronic module exit through a
connector mounted to the outer surface of the cover assembly.
1.3 Transmitter Description and Function
The passive sonar transmitter receives electrical signals from the sensor
head. The signals are processed using sonar array processing firmware
that displays the calculated results on an integral LCD screen. Results
can be transmitted using the 4
–20mA analog output, pulse output, alarm
output, MODBUS / RTU RS-485/232 interface or optional Foundation
Fieldbus
™. The electronic assembly is housed in a rugged NEMA 4X
enclosure.