Omega Engineering ULTRASONIC LEVEL TRANSMITTER LVU-90 - Manual (Page 2)

Step One
SPECIFICATIONS
Range: 3.6" to 6' (9 cm to 1.8 m)
Accuracy: ± .25% of span in air
Resolution: 0.125” (3 mm)
Frequency: 83 kHz (nominal)
Pulse rate: 2 pulses per second
Beam width: 8° conical
Dead band: 3.6” (9 cm)
Supply voltage: 12-36 VDC
Max loop resistance: 600 Ohms @ 36 VDC
Signal output:
4-20 mA, 12-36 VDC
Fail-safe diagnostics: Reverts to 22 mA
LED flashing
Temperature rating: F: -40º to 140º
C: -40º to 60º
Temp. compensation: Automatic over entire range
Pressure rating:
30 psi (2 bar) @ 25 °C., derated @ 1.667 psi
(0.113 bar) per °C. above 25 °C.
Enclosure rating: NEMA 4X / IP65
Enclosure material: Polypropylene, U.L. 94VO
Transducer materials: PVDF
Mounting threads:
3/4” NPT for LVU-91
3/4” G for LVU-92
Mounting gasket: Viton (3/4" G) LVU-92 only
Conduit connection: 1/2” NPT
CE compliance:
EN 50082-2 immunity
EN 55011 emission
(pending)
About Ultrasonic Technology:
An ultrasonic sound wave is pulsed five times per second from the
base of the transducer. The sound wave reflects against the process
medium below and returns to the transducer. The microprocessor
based electronics measures the time of flight between the sound gen-
eration and receipt, and translates this figure into the distance between
the transmitter and process medium below.
Radius
6’ Range
8 ° Cone
Temperature/Pressure Derating
35
30
25
20
15
10
05
00
-40 -20 00 20 40 60
Operating Pressure (psi)
Temperature ( ° C)
Unacceptable
Range
Acceptable
Range
Maximum Temperature/Voltage Derating
Continuous 20 mA Curve
100
80
60
40
20
0
Operating Voltage (VDC)
Ambient Sensor
T
emperature (
° C)
Unacceptable
Range
Acceptable
Range
12 16 20 24 28 32 36
700
600
500
400
300
200
100
000
Max. Series Resistance (Ohms) 18 24 30 36
Supply Volyage (VDC)
Unacceptable
Range
Acceptable
Range
Electrical Loading Limits
POWER
4-20 mA
(-) (+)
GND 12-36 VDC
1
2
3
4
5
6
1 . 2
2 . 1
2 . 9
3 . 7
4 . 9
5 . 4
Radius
Inches
Range
Feet
3 . 1
5 . 2
7 . 3
9 . 5
11 . 6
1 3 . 7
Radius
cm