Specifications, Technology, Sinking vs. sourcing – Flowline LU30 EchoTouch User Manual
Page 2: 2" npt (2" g) 2.8, Lu30 - 5 0
Step One
SPECIFICATIONS
Range:
0.5 to 24.5 feet (15 cm to 7.4 m)
Accuracy:
± 0.25% of span (air)
Resolution:
0.125” (3 mm)
Frequency:
50 kHz
Pulse rate:
8 pulses per second
Beam width:
8° conical
Blocking distance:
0.5' (15 cm) minimum
Display type:
4 segment LED
Display units:
Inch (cm)
Memory:
Non-volatile
Supply voltage:
14-36 VDC
Consumption:
200 mA
Current flow:
Source / sink
Signal output:
4-20 mA, three-wire
Signal invert:
4-20 mA / 20-4 mA
Signal averaging:
Fast / slow
Calibration:
Push button
Relay type:
(1) SPDT
Relay output:
250 VAC, 10A, 1/4 hp
Relay mode:
Selectable, NO or NC
Relay indication:
ON / OFF status
Contact resistance:
30 milliohm
Fail-safe diagnostics: Relay reverts to safe position
Process temp.:
F: -4º to 140º C: -20º to 60º
Temp. compensation: Automatic over entire range
Electronics temp.:
F: -40º to 140º C: -40º to 60º
Pressure rating:
30 psi (2 bar) @ 25 °C., derated @ 1.667 psi
(.113 bar) per °C. above 25 °C.
Enclosure rating:
NEMA 4X (IP65)
Enclosure material:
Polypropylene, U.L. 94VO
Transducer material: Polyvinylidene Fluoride
Cable jacket mat’l:
Vinyl
Cable length:
9” (22 cm)
Mounting threads:
2” NPT (2" G)
Mounting gasket:
Viton (metric only)
Conduit connection: Single, 1/2" NPT
Classification:
General purpose
CE compliance:
EN 61326 EMC
EN 61010-1 Safety
Technology
An ultrasonic sound wave is pulsed eight times per second from the base of the transducer. The
sound wave reflects against the process medium below and returns to the transducer. The micro-
processor based electronics measure the time of flight between the sound generation and
receipt, and translates this figure into the distance between the transmitter and process medium
below.
Sinking vs. Sourcing
The LU30 is manufactured in two different outputs, sourcing and sinking. A sourcing transmitter
uses the negative of the power supply as the reference for the entire system. When using a sourc-
ing unit, make sure the negative of the ground is the common for the entire system. A sinking
transmitter uses the positive of the power supply as the reference for the entire system. When
using a sinking unit, make sure the positive of the ground is the common for the entire system.
Holding down the
[MENU] key will
scroll the display in
the following
sequence.
4.9"
(124 mm)
1.3"
(32 mm)
3.6"
(92 mm)
2" NPT (2" G)
2.8"
(71 mm)
LU30 - 5 0
_
_
Mounting Thread
0 - 2" NPT
6 - 2" G
Switch Output
3 - 4-20 mA, Sourcing
4 - 4-20 mA, Sinking
Ultrasonic Transmitter
+ -
DC Power
Supply
14-36 VDC
- +
Red
Black
White
(+)
(-)
(S)
+ -
DC Power
Supply
14-36 VDC
- +
Red
Black
White
(+)
(-)
(S)
40
35
30
25
20
15
10
05
00
-40
-20
00
20
40
60
80
Acceptable
Range
Unacceptable
Range
Temperature/Pressure Derating
Operating Pressure (psi)
Temperature ( C)
100
80
60
40
20
0
Maximum Temperature/Voltage
Derating @ Continuous 20 mA
Ambient Sensor
T
emperature ( C)
Operating Voltage (VDC)
Acceptable
Range
Unacceptable
Range
12
16
20
24
28
32
36
2,000
1,500
1,000
500
0
Acceptable
Range
Unacceptable
Range
Flowline Electrical Loading Limits
Max. Series Resistance (Ohms)
12
18
24
30
36
Supply Voltage (VDC)
LU30-50_4, LU50-70_4
LU30-50_3, LU50-70_3
MENU
SET
RELAY
Echotouch
TM
Ultrasonic Transmitter
LE
V
E
L
,
E
C
4
,
E
C
2
0
,
R
LA
Y ,
HS
ET,
LS
ET
,S
AF
1/
2,
FA
S
T
/S
L
O
W
,
A
L
IN
,
O
F
F/
ON
, TA
NK, (value)
9" Cable
(22 cm)
Red
Black
White
Blue
Green
Yellow
(+)
(-)
Signal
COM
NC
NO
Sourcing
LU30-50_3
Sinking
LU30-50_4