A. Operating Principle: Microprocessor-based, echo-time measurement utilizing a transmitter which emits ultrasonic pulses and receives echoes reflected back from the liquid surface
B. Manufacturers
Rosemount 3100 Series Transmitters with 3490 Universal Control Unit
Siemens Hydro Ranger Transmitter with XPS-10 Transducer
C. Specifications
1. Measuring Range: 1 to 39 ft (0.3 to 12 metres).
2. Accuracy: 0.25% measured distance or better
3. Signal Output: 4-20 mA configurable for either level or volume
4. Temperature Rating:
a. Transmitter/Transducer: -40 to 140 deg F
b. Control Unit: -40 to 130 deg F
5. Ingress Protection:
a. Transmitter/Transducer rated for unintended submersion (e.g. IP68, NEMA 6)
b. Control unit rated for outdoor installation (e.g. IP65, NEMA 4)
6. Hazardous Location Approval: FM for Class I, Division I, Groups A, B, C, D
7. Wetted Materials: Resistant to corrosion and chemicals (e.g. UPVC, Kynar®)
8. Beam Angle: 6 degrees or less from vertical
9. Relays: 2 or more integral to the transmitter or control unit, minimum rated 2 A @ 30 VDC for resistive loads
10. Power:
a. Transmitter/Transducer powered by the control unit
b. Control Unit: 110 VAC
D. Features
1. Integral temperature sensor to compensate for changes in speed of sound
2. Integral manufacturer’s cable to connect the transmitter/transducer to the control unit
3. Included mounting bracket for suspended installations
4. Integral NPT threads for fixed-mount installations
5. Configurable via keypad programming tool, integral buttons, or with manufacturer’s asset management software
6. Configurable LCD display with selectable units of measure
7. Onboard Level to Volume conversion using standard geometric profiles or look-up table
8. Capability to map and ignore false echoes
E. Manufacturer-supplied options depending on application requirements
1. Plastic NPT to ANSI-style adapter flanges
2. External temperature input for improved speed of sound compensation where the transmitter will be mounted in full sun
3. Head-verification assembly for in-situ calibration verification
4. Submersion-shield