3020TR Acoustic Transceiver

The Model 3020TR Acoustic Transceiver serves a dual role in the SP and MMP systems: it is used as both a sound transmitter and a sound receiver. When connected as a transmitter at the sound source end of the measurement path, it uses compressed air to generate the sound signal required for the path flight-time measurement, and also acts as a local receiver to measure the transmitted signal as it is being launched. When connected as a receiver at the destination end of the measurement path, the 3020TR acts as a microphone to collect the sound signal traveling from the source transceiver at the opposite end of the measurement path.

The 3020TR consists of a stainless steel waveguide horn unit which mounts on the outside of the boiler wall, and an amplifier assembly contained in a small separate NEMA enclosure, mounts nearby up to 10 feet (3 meters) from the waveguide horn. The waveguide horn physically mounts to an opening in the boiler or furnace wall. The horn is made from stainless steel 316L alloy, and it‘s mounting flange dimensions conform to American Society of Testing Materials (ASTM) specifications for a 3-inch diameter 150 lb schedule 40 pipe flange. A 6-inch diameter furnace wall opening is recommended to properly accommodate a wall transition adapter to which the waveguide horn is mounted. The waveguide contains a solenoid air valve and special nozzle arrangement that uses plant general service compressed air to generate the acoustic sound signal. The solenoid valve is available in 120 VAC 60 Hz, or 230 VAC 50 Hz configurations to match the operating power of the Processor/Control Unit. A piezoelectric receive transducer contained in a rugged Hastelloy case is located at the horn flange, and is used as a microphone to detect acoustic signals entering and leaving the waveguide.

The amplifier assembly is provided in a moisture-proof steel (or optional fiberglass) enclosure, and contains a dual-gain preamplifier, disable switch, and terminal block wiring termination. The manually operated disable switch is accessible from the exterior of the enclosure, and is used to disable the pneumatic sound source, preventing it from activating when maintenance is being performed on the waveguide. Flexible conduit and wire for all connections between waveguide horn unit and amplifier assembly are included.

Specifications

Waveguide Horn Unit
Material:	Stainless Steel 316L alloy (other materials available)
Dimensions:	12.78 (324 mm) L, 7.88 (200 mm) flange diameter
Weight:	26 lb. (11.8 Kg)
Flange Temperature:	500o F (260o C) Maximum
Ambient Air Temperature:	140o F (60o C) Maximum
Air Service Connection:	1 NPT Female
Aspirating Air:	Optional manual ball valve (1/2 NPT female)
Amplifier Assembly
Material:	Steel NEMA, type 4, gray paint finished Fiberglass (optional)
Dimensions (steel enclosure):	13.5" H, 11.4" W, 5.4" D (343 x 288 x 137 mm)
Dimensions (fiberglass enclosure):	14" H, 10.5" W, 7.5" D (356 x 267 x 191 mm)
Weight (steel enclosure):	13.5 lb. (6.1 Kg)
Weight (fiberglass enclosure):	9 lb. (4 kg)
Operating Temperature:	140o F (60o C) maximum ambient air