Dwyer Instruments ProxiMity UL Series User manual

UltrasonicLevelTransmitter
Specifications – Installation and Operating Instructions
Series
UL
Bulletin E-81-UL
R4-124056-00
DIV OF DWYER
102 HWY 212 MICHIGAN CITY,IN. 46060, U.S.A.
7.000
10.000
Ø2.875
Ø7.500
Ø7.500
3.000
FLANGE
SPECIFICATIONS
Accuracy: ⫾0.3% of span.
Repeatability: ⫾0.125⬙(+3 mm) typical.
Supply Voltage: 115⫾10% VAC, 5-/60 Hz, 5 VA.
Output: 4 to 20 mA into 600 isolated.
Blind Zone: (UL100) 12⬙(5 cm), (UL200) 18⬙(7 cm).
Beam Angle: Conicle 12°.
Sensor Pressure Rating: 150 psig maximum.
Temperature Compensation: –20 to 180°F (–30 to 82°C).
Temperature Range: Sensor: –20 to 180°F (–30 to 82°C),
Electronics: –10 to 160°F (–23 to 71°C).
Sensor Material: CPVC.
Control Box Enclosure: Polycarbonate, NEMA 4X.
Mounting: (UL100) 2⬙PVC 150# flange, (UL200) 3⬙PVC 150#
flange.
ELECTRICAL INSTALLATION
When routing wires, the AC power must be kept sepa-
rate from the analog output. Do not run the analog out-
put in the same conduit with any AC power or near any
AC wiring or AC conduit. If using several UL transmit-
ters, do not run the sensor cables together. The sensor
cables must be run in separate conduit or interference
may result.
Use 18 AWG shielded two conductor cable for the out-
put signal. Use 16 AWG two conductor cable for the
power and ground. Connect the sensor cable as shown
in figure 1, with the red wire connected to the “TC” ter-
minal, the center of the cable connected to the “CENT”
terminal, and the shield of the cable to the “SHIE” ter-
minal.
NOTE: Do not use the Series UL Ultrasonic Level
Transmitter in applications where foam, agitation or
heavy vapor are present.
GENERAL
The Series UL Ultrasonic Level Transmitter provides
continuous, noncontact sensing for level control of liq-
uids or slurries. The sensor emits an ultrasonic pulse
which is reflected back to the sensor at the liquid/air
interface. The distance traveled by the pulse is calcu-
lated and converted to a 4 to 20 mA output signal.
MECHANICAL INSTALLATION
The sensor should be mounted on the top of the vessel
with the sensor facing down. The sensor face should be
parallel to the surface being measured. A clear path, free
of obstructions must be provided between the sensor
and the liquid surface. Obstructions in the beam path
will cause incorrect readings.
The ultrasonic wave spreads as it travels from the sen-
sor to the target material with the beam angle being 6.5
degrees from the center line. Typically the beam diame-
ter will increase three inches (3⬙) for every foot (1⬘) of
range. For example: An 18⬘deep tank will have a beam
diameter of 54⬙(3⬙⫻18⬘) in diameter at the bottom of
the tank.
A blind zone exists directly in front of the sensor. Liquid
levels cannot be detected in the blind zone. The UL100
has a blind zone of 12⬙, and the UL200 has a blind zone
of 18⬙. If it is necessary to measure to the top of the ves-
sel, the sensor may be raised above the tank with a pipe
or other means. The diameter of the pipe or extension
piece must be greater than 6⬙. Be sure not to mount the
sensor too close to the tank wall.
The Series UL include a 2⬙or 3⬙mounting flange. Sim-
ply bolt the sensor/flange assembly to the proper mat-
ing flange connection. The NEMA 4X control box can be
remotely mounted at a maximum distance of 100 feet
(30 m).
PROXIMITY Controls, A Division of Dwyer Instruments, Inc., Rte. 6, Box 386, Hwy 210 E, Fergus Falls, MN 56537/Phone [phone] 879-1452/Fax [phone] 872-9057 73

OPERATION
The Series UL is factory calibrated. Do not make ad-
justments on the board except programming English/
Metric, failsafe condition, and desired zero and span.
All programming is achieved through five numbered
BCD turn switches and two slide switches, see Figure 1.
Select english (inches) or metric measurement (cen-
timeters divided by two) using the slide switch marked
“E” or “M.” English (inches) is designated by “E,” metric
designated by “M.” The slide switch marked “H” and
“L” determines the failsafe condition if the echo is lost.
If “H” is selected, the output becomes 21 mA if the
sensor loses the echo. If “L” is selected, the output
becomes 3 mA if the echo is lost.
SETTING ZERO AND SPAN
The span is the distance from the sensor face to the
closest point or level to be measured. This point corre-
sponds to an output of 20 mA. The span must be ad-
justed for a distance greater to or equal to the dead
zone. See Figure 2. The Model UL100 has a dead zone
of 12⬙and the UL200 has a dead zone of 18⬙. Set the
span using a small screwdriver and adjusting the two
BCD switches labeled “SPAN” (Figure 1). The left
switch adjusts in increments of ten, the right switch ad-
justs in increments of one. Example: left switch set at
1, right switch set at 2 corresponds to 12. The zero is
the distance from the sensor to the furthest point or
level to be measured. This point corresponds to an
output of 4 mA. Using the three BCD switches marked
“ZERO,” adjust the zero distance in the same manner
as the span was adjusted. From left to right, the
switches adjust in increments of 100, 10 and 1. Exam-
ple: far left set at 1, middle set at 2, right switch set at
0 corresponds to 120.
LED INDICATION
Apply power to the unit. During normal operation, the
red LED will flash. If the red LED is off, the unit is not
receiving an echo. Check sensor wiring and place-
ment. Be sure the sensor points at the liquid surface
with the sensor face parallel to the liquid. If the red LED
remains on, the unit is receiving out of range echos.
Check tank measurements, reprogram, and check E/M
slide switch for proper setting.
A flashing yellow LED indicates power fluctuations or
the temperature wire is not connected. Verify the red
wire from the sensor is connected to the “TC” terminal.
Also make certain the power source is not shared with
motors or heavy switching loads. All instrumentation
should be on its own power source.
MAINTENANCE
After final installation of the Series UL Ultrasonic Level
Transmitter, no routine maintenance is required. Peri-
odic checks of connections and sensor placement is
recommended. Units are not field serviceable and
should be returned to the factory, freight prepaid, if
repair is necessary. Be sure to include a complete
description of the application and problem.
FIGURE 1
FIGURE 2
R4-700447-00
HUNDREDS
TENS
ONES
TENS
ONES
GREEN
LIGHT
GAIN
OUTPUT–
+
E
ML
H
ZERO SPAN
YELLOW
LIGHT
RED
LIGHT
4-20mAOUTPUT
TC
CENT
SHIELD
GND
NEUT
HOT
TO120VACAND GROUND
BEAMANGLE
SENSOR(SIDE)
SENSOR(SIDE)
R4-700447-01
HIGH LEVEL
READING 20 mA
OUTPUT SENSOR
SENSOR
FACE
SPAN SETTING
ZERO SETTING
OUTPUT mA
LOW LEVEL
READING 4 mA
OUTPUT
FOR MODEL UL100
SPAN SETTING MUST BE
12 INCHES OR GREATER.
FOR MODEL UL200
SPAN SETTING MUST BE
18 INCHES OR GREATER.
BOTH SPAN AND ZERO
SETTINGS ARE MADE
FROM THE FACE OF THE
SENSOR.
TANK OR ANY OTHER
MEASUREMENT TO BE
MADE.
NOTES:
1. ALL MEASUREMENTS IN INCHES (E) OR (M)
2. MEASURING RANGE OF SYSTEM IS ZERO SETTING MINUS SPAN SETTING
LAYOUT AND CONNECTIONS
SETUP AND PROGRAMMING
PROXIMITY Controls, A Division of Dwyer Instruments, Inc., Rte. 6, Box 386, Hwy 210 E, Fergus Falls, MN 56537/Phone [phone] 879-1452/Fax [phone] 872-9057
74