| LEVEL & FLOW MONITOR SPECIFICATIONS
SCOPE: This specification covers a non-contacting ultrasonic Level/Flow Monitor as manufactured by Greyline Instruments, Largo, Florida / Long Sault, Ontario. This instrument shall provide for indicating, transmitting and control of the material level in a vessel or proximity of a target to the instrument sensor, and indicating, transmitting, and totalizing of the flow rate through a flume, weir, or other primary measuring device.
A. GENERAL
- Level/Flow Monitor to consist of an non-contacting ultrasonic sensor, connecting cable, and a remote enclosure with indicating, transmitting and controlling electronics.
- Measurement accuracy shall be ±0.25% of Range or 2 mm (0.08"), whichever is greater, and shall be automatically temperature compensated.
- Sensor cable length shall be as required by installation, not to exceed 500' (152 m).
- System shall have no moving parts and shall not contact the material being measured.
- Shall include PC software program disk to determine open channel flow calibration values for non-standard flumes and weirs.
B. SENSING ELEMENT
- Sensor shall be constructed of PVC and Teflon.
- The sensor shall have a minimum deadband or blanking of 12" (305 mm) and a maximum range of 32 ft. (10 m), and have an operating frequency of 42 kHz with an ultrasonic beam angle of 8 Degrees.
- Sensor shall withstand accidental submersion to 20 psi.
- Sensor operating temperature shall be from -40°F to 150°F (-40°C to 65°C).
- Sensor shall include integral temperature sensor. Temperature sensors requiring separate mounting and wire runs shall not be accepted.
C. SENSOR CONNECTING CABLE
- Provide RG62AU coaxial cable 25' (7.6m) continuous length, with waterproof, potted bond to the Sensor head.
- Extended sensor cable shall be RG62AU coaxial to a maximum of 500' (152m). Cable shall be spliced with screw terminal connections in manufacturer's recommended steel NEMA4 Junction Box.
- Level and temperature signals shall be conducted on one single coaxial cable. Separate or multiple-conductor cables shall not be accepted.
- Sensor cable shall be installed in grounded metal conduit.
D. TRANSMITTER
- The transmitter shall provide for field-calibration via built-in 5-key calibration system with menu selection of parameters. Systems requiring calibration by Parameter codes, BCD switches or external calibrators shall not be accepted.
- Calibration data shall be password protected and permanently stored through power interruptions for a minimum of 12 months.
- Field calibration shall allow selection and automatic conversion of measurement units, measurement span and control relays.
- The transmitter shall provide for field calibration in user-selected Range, Level or Open Channel Flow modes. Flow mode shall allow calibration to common primary metering devices, plus allow entry of calibration formula for non-standard flumes, weirs or open channels.
- Transmitter shall permit field programmable damping to smooth output with turbulent level.
- Transmitter operating temperature shall be from -5° to 140°F (-20° to 60°C). Transmitter shall contain a thermostat-controlled enclosure heater for condensation protection below 30°F (-1°C).
- Transmitter shall have an isolated 4-20mA output rated for 1000 ohm maximum load with menu-selectable 0-5VDC alternative.
- Provide two relay contacts rated 5 amp SPDT programmable for single set point alarms, dual set point pump control, pump alternation, temperature alarm, flow totalizer pulse and/or echo loss alarm.
- Provide a white, backlit matrix LCD display indicating flow rate, level, velocity, totalizer and relay states in user-selected engineering units.
- Transmitter display indicating level or flow rate, units of calibration, totalizer and relay states shall be visible without opening cover.
- Transmitter shall be housed in a wall-mount, watertight NEMA4X (IP66) enclosure with hinged, clear cover. Mounting hardware shall be included.
- Transmitter electronics shall be surge protected on AC power input, sensor and 4-20mA outputs.
- Transmitter power input shall be 100-240VAC 50-60Hz with power consumption of 3.5 Watts or less.
- The transmitter shall permit plug-in field installation and auto-detection of optional accessories including data logger and additional control relays.
E. OPTIONAL FEATURES FOR INSERTION AS REQUIRED
- Have 4 additional (6 total) control relays, rated 5 amp SPDT and programmable for single set point alarms, dual set point pump control, pump alternation, temperature alarm, flow totalizer pulse and/or echo loss alarm.
- Sensor, connecting cable and junction boxes shall be rated intrinsically safe to Class I,II,III, Div. I,II, Groups C,D,E,F,G.
- Have a thermostat controlled enclosure heater for Transmitter operation at temperatures below freezing.
- Have an all-Teflon sensor Model PZ32TE rated intrinsically safe when connected through an approved safety barrier, and rated for operation from -40°F to 170°F (-40°C to 76°C).
- Have a PVC and Teflon sensor Model PZ56 rated for measurement range on liquids up to 50 ft. (15.6 m).
- Have a Teflon-faced flange mount sensor model PZ34TxF rated for 32 ft (10 m) measurement range. Specify flange size of 4” or 6”.
- Have manufacturer's recommended enclosure sunscreen to permit Transmitter mounting in direct sunlight.
- Have manufacturer's recommended Sensor sunscreen to permit temperature-compensated Sensor mounting in direct sunlight.
- Have manufacturer's recommended Panel Mount Flange assembly for enclosure installation.
- Have a built-in 2 million point Data Logger with USB output to flash drive or mass storage device. Include Windows software.
- Have power input of 9-32VDC and power consumption of less than 3.5 Watts.
F. MANUFACTURER
Level/Flow Monitor shall be Model SLT 5.0 as manufactured by Greyline Instruments Inc. and shall be warranted against defects in materials and workmanship for one year.
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