WARRANTY
Gems Warranty
Gems warrants to the original purchaser of its products that such products
will be free from defects in material and workmanship under normal use
and service for a period which is equal to the shorter of one year from the
date of purchase of such products or two years from the date of manufacture of such products.
This warranty covers only those components of the products which are
non-moving and not subject to normal wear. Moreover, products which are
modified or altered, and electrical cables which are cut to length during
installation are not covered by this warranty.
Gems’ obligation under this warranty is solely and exclusively limited to the
repair or replacement, at Gems’ option, of the products (or components
thereof) which Gems’ examination proves to its satisfaction to be defective.
Gems SHALL HAVE NO OBLIGATION FOR CONSEQUENTIAL DAMAGES
TO PERSONAL OR REAL PROPERTY, OR FOR INJURY TO ANY PERSON.
This warranty does not apply to products which have been subject to
improper use, accident, negligence, abuse or misuse. Abuse shall be assumed
when indicated by electrical damage to relays, reed switches or other
components. The warranty does not apply to products which are damaged
during shipment back to Gems’ factory or designated service center or
are returned without the original casing on the products. Moreover, this
warranty becomes immediately null and void if anyone other than service
personnel authorized by Gems attempts to repair the defective products.
Equipment sold by Gems Sensors Inc. not intended for use in a nuclear
installation, nor shall it be used as a “Basic Component” as same as defined
under Part 21, Title 10 of the Code of Federal Regulations. In the event
of such use, you agree to indemnify and hold us harmless from any and all
subsequent liabilities and responsibilities which might arise in connection
with such use.
Warranty, Service & Repair
UCL-520 Two-Wire
Ultrasonic Level Transmitter
Owner’s Manual
Part Number 225200
I
P
67
Version C
© 2008 Gems Inc.
All rights reserved.
Manual # 226009
Return Policy
Returns are accepted on stock items up to 30 days from date of order.
You must contact our Returns Department for a Return Authorization (RA) number. Return the goods – freight prepaid – in the original container and include
original packing slip. C. O. D. returns are not accepted. Gems reserves the right to apply restocking charges.
Gems further reserves the right to unilaterally waive this warranty and to dispose of any product returned to Gems where:
a. There is evidence of a potentially hazardous material present with or on the product.
b. The product has remained unclaimed at Gems for longer than 30 days after dutifully requesting disposition of the product from the Customer.
THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE OF THIS WARRANTY. This warranty and the obligations and liabilities of Gems under it are exclusive and instead of, and the original purchaser hereby waives all other remedies, warranties, guarantees or liabilities, express or
implied. EXCLUDED FROM THIS WARRANTY IS THE IMPLIED WARRANTY OF FITNESS OF THE PRODUCTS FOR A PARTICULAR PURPOSE OR USE AND THE
IMPLIED WARRANTY OF MERCHANTABILITY OF THE PRODUCTS.
Important Points:
• Gems products must be maintained and installed in strict accordance with the National Electrical Code and the applicable Gems product instruction Bulletin that covers installation, operation and proper maintenance. Failure to observe this information may result in serious injury or damages.
• The supply voltage to the sensor should not exceed 36 VDC, Max.
• Please adhere to the pressure and temperature limitations shown. These limitations must not be exceeded. These pressures and temperatures take into
consideration possible system surge pressures/temperatures and their frequencies.
• Selection of materials for compatibility with the media is critical to the life and operation of Gems products. Take care in the proper selection of materials
of construction, testing is required.
• Avoid over tightening when mounting.
• Life expectancy of switch contacts varies with application. Contact Gems if life cycle testing is required.
• Ambient temperature changes do affect switch set points, since the gravity of a liquid can vary with temperature.
• Our sensors have been designed to resist shock and vibration. However, shock and vibration should be minimized.
• Electrical entries and mounting points in an enclosed tank may require liquid/vapor sealing.
• Our sensors must not be field-repaired.
• Physical damage sustained by product may render it unserviceable.
This warranty may not be extended, altered or varied except by a written instrument signed by a duly-authorized officer of Gems, Inc.
SPECIFICATIONS
40
30
20
10
00
-40 -20 00 20 40 60 80
Acceptable
Range
Unacceptable
Range
Temperature/Pressure Derating
Operating Pressure (psi)
Temperature ( C)
12 16 20 24 28
Unacceptable
Range
Maximum Loop Resistance
Max. Series Resistance (Ohms)
Supply Voltage (VDC)
1,000
800
600
400
200
000
- Enhanced
Performance
- Specified
Performance
- Limited
Performance
5.2"
(133 mm)
3.8"
(96 mm)
4.1"
(104 mm)
3.4"
(88 mm)
5.5"
(138 mm)
4.0"
(100 mm)
2" NPT
(2" G)
5.2” (133mm)
2.7"
(69 mm)
Step One
Range: 8” to 26.2’ (20 cm to 8 m)
Accuracy: +/- 0.2% of span in air
Resolution: 0.039" (1 mm)
Beam width: 3” (7.6 cm) dia.
Dead band: 8” (20 cm)
Display type: LCD, 6-digit
Display units: Inch, cm or percentage
Display mode: Air gap or liquid height
Memory: Non-volatile
Supply voltage: 12- 28 VDC
Loop resist,: 500 Ohms @ 24 VDC
Signal output: 4 - 20 mA, two -wire
Signal invert: 4-20 mA, 20-4 mA
Calibration: Push button
Fail-safety: Selectable: 4 mA, 20 mA, 21 mA,
22 mA or hold last value
Process temp.: F: -4° to 140°
C: -20° to 60°
Temp comp,: Automatic
Electronics temp.: F: -40° to 160°
C: -40° to 71°
Pressure: 30 psi (2 bar) @ 25 °C., derated @
1.667 psi (113 bar) per °C, above 25 °C
Enclosure rating: NEMA 4X (IP65)
Enclosure vent: Water tight membrane
Encl. material: PC/ABS FR
Trans. material: PVDF
Process mount: 2” NPT (2” G)
Mount. gasket: Viton®
Conduit entrance: Dual, 1/2” NPT
Classification: General purpose
CE compliance: EN 61326 EMC
Side View
Top View
SELECT / FAST
Button
To activate the top
menu, press and
hold SELECT / FAST
button for 5 seconds
DISPLAY
TOP MENU
UNITS TANK SAFE TGCAL VALUES RUN
SELECT
Display Units
Inches
Centimeters
Percentage
Display
SELECT
4-20 Span
Height (4 mA)
Fill H (20 mA)
Rev mA
Help
SELECT
Fail-Safety
22 mA
21 mA
20 mA
4 mA
Hold
SELECT
Target-Cal
FULL
EMPTY
Help
SELECT
Diagnostics
Setup
Diagnostics
Reset
HELP
SELECT
Diagnostics
Contact
SAFETY
Step Two
OVERVIEW
Step Three
About this Manual: PLEASE READ THE ENTIRE MANUAL
PRIOR TO INSTALLING OR USING THIS PRODUCT. This
manual includes information on the UCL-520 Ultrasonic Level
Transmitter from Gems. Please refer to the part number located on
the transmitter label to verify the exact model configuration which
you have purchased.
User’s Responsibility for Safety: Gems manufactures a
broad range of level sensing technologies. While each of these sen-
sors is designed to operate in a wide variety of applications, it is the
user’s responsibility to select a sensor model that is appropriate for
the application, install it properly, perform tests of the installed
system, and maintain all components. The failure to do so could
result in property damage or serious injury.
Proper Installation and Handling: Only properly trained
staff should install and/or repair this product. Install the transmitter
with the Viton gasket and never overtighten the transmitter within
the fitting. Always check for leaks prior to system start-up.
Wiring and Electrical: A supply voltage (loop power) of 12
-28 VDC is used to power the UCL-520 transmitter. The sensor
circuit should never exceed a maximum of 28 volts DC. Electrical
wiring of the sensor should be performed in accordance with all
applicable national, state, and local codes.
A. Application: The general-purpose ultrasonic transmitter pro-
vides non-contact level detection up to 26.2' or 8 m. The transmitter
is well suited for a wide range of corrosive, waste and slurry type
media, and is broadly selected for atmospheric bulk storage, day tank
and waste sump applications.
B. Part Number: The part and serial numbers are located on the
wrench flat. Check the part number on the product label and confirm
which of the below model configurations you have purchased:
Part Number Range Supply Mount
UCL-520 26.2’ (8 m) 12-28 VDC 2” NPT
C. NEMA 4X Enclosure: The NEMA 4X (IP65) enclosure has
a flip cover with two 1/2” NPT female conduit ports and an internal
terminal strip for wiring. To open the enclosure, you will need a small
small screwdriver. Insert the tool into the hole located at the top edge
of the enclosure and turn counter-clockwide. Rotate the hinged cover
up for 135° access to the faceplate screen and terminal strip.
Material Compatibility: The UCL-520 transmitter enclosure
is made of a flame retardant Polycarbonate (PC/ABS FR). The
transducer is made of Polyvinylidene Fluoride (PVDF). Make sure
that the model which you have selected is chemically compatible
with the application media and it’s environment.
Enclosure: While the transmitter housing is liquid-resistant the
UCL-520 transmitter is not designed to be operational when
immersed. It should be mounted in such a way that the enclosure
and transducer do not come into contact with the application media
under normal operational conditions.
Make a Fail-Safe System: Design a fail-safe system that
accommodates the possibility of transmitter and/or power failure.
Gems recommends the use of redundant backup systems and
alarms in addition to the primary system.
Flammable, Explosive or Hazardous Applications:
Do not use the UCL-520 transmitter of general purpose transmit-
ters within classified hazardous environments.
Warning
Always use the Viton gasket when installing the UCL-520 transmitter in its fitting, and always connect the shield wire to the
common ground.
Closed
Before closing the enclosure, make sure that the enclosure gasket is
properly seated, and that any conduit fittings, liquid tight cable connectors and/or plugs are properly installed and sealed.
Open
Handling Static-Sensitive Circuits/Devices
When handling the transmitter, the technician should follow
these guidelines to reduce any possible electrostatic charge
build-up on the technicians body and the electronic part.
1. Always touch a known good ground source before handling the
part. This should be repeated while handling the part and more
frequently after sitting down from a standing position, sliding
across the seat or walking a distance.
2. Avoid touching electrical terminals of the part unless making connections.
3. DO NOT open the unit cover until it is time to calibrate.
PREPARATION
20 mA
4 mA
50Khz
0 1 2 3 4 5 6 7 8 9 10
0%
50%
100%
HEIGHT
(MaxR)
FILL H
(MinR)
EMPTY
FULL
Step Four
MENU ITEMS
Step Five
A. Supply Voltage: The transmitter power supply voltage should
never exceed a maximum of 28 VDC. Gems controllers and meters
have built-in 24 VDC power supplies for use with the transmitter.
Alternative controllers and/or power supplies with a minimum output
of 12 VDC may also be used with the transmitter for calibration and/
or operation.
B. Cable Length: The cable length between the transmitter and
it’s point of termination may be extended up to a maximum of 1000
feet, using a well-insulated, shielded wire from 14 to 18 gauge.
C. Factory Span: All transmit-
ter models are factory calibrated with
4 mA at their maximum range (tank
empty) and 20 mA at their minimum
range (tank full). For optimum
measurement performance up to
26.2' or 8 m, the UCL-520 should
be calibrated with 4 mA at it’s
minimum range (tank full) and 20
mA at it’s maximum range (tank
empty). The 4 and 20 mA span set
points can be reverse calibrated on
all models.
UCL-520
Reverse Mode
D. Maximum Applied Range: The Individual or cumulative
effects of agitation, vapor or foam can reduce the overall quality of
signal return and shorten the maximum applied range of the transmit-
ter. To determine the maximum applied range of the transmitter in
your application, refer to the below derating chart.
Maximum Applied Range Derating Chart
UCL-520
Agitation = 1-3 @ 50 kHz
Vapor = 3-5 @ 50 kHz
Foam = 4-6 @ 50 kHz
A. WARMUP: This is the initial power up mode. When this mes-
sage is displayed, the transmitter is going through its power up rou-
tine, and validating the target value. After a short period of time, this
message will disappear and be replaced by a numeric value.
B. FULL: Level has reached the programmed FULL set point.
C. EMPTY: Level has reached the programmed EMPTY set point
D. UNITS: Selectable in Inches Centimeters or Percent. The factory
default is Inches.
E. INCHES: Inch units of measurement.
F. CM: Centimeters units of measurement.
G. PERCNT: 0-100% units of measurement. Percent is the calcu-
lated value based on the 4mA and 20mA set points.
H. DISPLAY: Allows the user to select if the display will read in
units of air or units of liquid. Factory default is units of air.
H. TANK: Menu through which the 4-20 mA span is adjusted.
I. HEIGHT: The point in inches or
centimeters from the transducer face
where the output will be 4 mA (gen-
erally the bottom of the tank).
Factory default is the same as the
unit’s maximum range. Example:
UCL-520 = 314” maximum range
which is also the same 4 mA set
point under factory default.
J. Fill H (Fill Height): The point
in inches or centimeters from the
bottom of the tank to the high level
where the output will be 20 mA
(generally the straight wall distance
from the bottom of the tank). NOTE:
The transmitter dead band is auto-
matically subtracted from the FILL
H. Example: UCL-520 = 8” dead
band. Therefore the maximum FILL
H is 306” [maximum range] - 8”
[dead band] = 306”.
K. REV mA (Reverse mA): Allows the user to select 20 mA at
the bottom and 4 mA at the top of the tank (20-4 mA). Factory default
is 4 mA (MaxR) at the bottom and 20 mA (MinR) at the top.
L. SAFE: The FAIL-SAFE current output of the transmitter if the
acoustic signal is LOST. Selectable at 4 mA, 20 mA, 21 mA, 22 mA
or HOLD. (HOLD is the last 4-20 mA value prior to LOST).
M. TG CAL: Allows the user to use an unknown distance for setting
of the 4 mA and 20 mA span.
MENU ITEMS
Step Six
PROGRAMMING
Step Seven
N. FULL: Target calibration technique that allows the user to enter
the present distance from the transducer face to the liquid or a reflec-
tive target as the 20 mA (FULL) set point
O. EMPTY: Target calibration technique that allows the user to
enter the present distance from the transducer face to the liquid or a
reflective target as the 4 mA (EMPTY) set point.
P. WAIT: Indicates that you have selected either FULL or EMPTY
and the transmitter is calculating the distance value.
Q. VALUES: Allow the user to view the present calibration settings
that are programmed in the transmitter.
R. SETUP: Displays the present calibration settings such as UNITS,
MinR, MaxR, and SAFE.
S. MINR: The lesser distance from the transducer to the full tank
height of liquid.
T. MAXR: The greater distance from the transducer to the empty tank
height of liquid.
U. RESET: Allows the user to reset the transmitter to its original
factory default settings.
V. DIAG (Diagnostics): Allows the user to view the present val-
ues of LEVEL, TEMP, ECHO, POWER, MOUNT and VER.
W. LEVEL: Displays the current Inch, Centimeter or Percent mea-
sured value.
A. Introduction: The transmitter has two modes, RUN and
PROGRAM. In the RUN mode, the transmitter is operational and the
display will indicate the liquid height in inches, centimeters or percent.
In the PROGRAM mode, the display will indicate the selected mode
of calibration. The transmitter arrives from the factory with its settings at 4 mA = maximum range and 20 mA = minimum range
(defined by the dead band or minimum measurement distance). The
transmitter is programmed with it’s built-in display and three button
keyboard. Under normal application circumstances, users typi-
cally program the HEIGHT distance value, FILL H distance
value and FAIL-SAFE mode.
+
--
UCL-520
UP DOWN
SELECT
FAST
B. Entering the Program Mode: Press and hold the
SELECT/FAST button for approximately 5 seconds until the display
changes from a numeric value to PROG, indicating that you have
entered the PROG mode.
Note: When PROG mode is active, the UCL-520 will hold the
last current value. The value will not change until the transmitter is returned to RUN Mode.
X. TEMP: Displays the temperature in the vessel at the transducer.
Y. ECHO: Displays the present acoustic signal strength.
Z. POWER: Displays the present acoustic power level
AA. MOUNT: Displays either QUIET (no fitting noise) or NOISY
(potential fitting noise), If NOISY with transmitter performance
issues, please contact Gems to discuss your installation.
BB. VER (VERSION): Displays the transmitter software version.
CC. DONE: Indicates that the new value has been saved in memo-
ry (after depressing the SELECT/FAST key).
DD. ERROR: Indicates that the new value has NOT been saved in
memory (after depressing the SELECT/FAST or EXIT key).
EE. RUN: When displayed, if the user depresses the SELECT/FAST
key, the transmitter will exit the programming mode and return to the
RUN mode for normal operation.
FF. UP / DOWN: Increases or decreases the SET 20 and SET 4
display values in the programming mode. NOTE: Simultaneously
holding down the SELECT/FAST button while pressing the UP or
DOWN button will increase the speed of the display.
+
--
UCL-520
UP DOWN
SELECT
FAST
After entering the PROG mode, the display will scroll through the top
menu, alternately flashing UNITS, TANK, SAFE, TG CAL, VALUES,
HELP and RUN.
Top Menu
Hold for
5 Seconds
PROGRAMMING PROGRAMMING
SELECT
FAST
SELECT
FAST
HEIGHT
(MaxR)
FILL H
(MinR)
40.0" of Air
UCL-520
100.0"
Height
UCL-520
60.0" of Liquid
100.0"
Height
SELECT
FAST
SELECT
FAST
SELECT
FAST
Step NineStep Eight
C. Programming UNITS: To change UNITS from INCHES to
CM or PERCENT.
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When UNITS appears, press the SELECT/FAST button. The display
will rotate between INCHES, CM, PERCENT and DISPLAY.
3. Press the SELECT/FAST button when the UNITS you want
(INCHES, CM or PERCENT) appear. The display will then dis-
play SAVED.
You have successfully changed the UNITS function.
Note: Percent units can only be selected after the transmitters Height (4 mA) and Fill H (20 mA) set points have
been programmed. Therefore initial programming should
always be done in INCH or CM UNITS.
D. Display Mode: The transmitter is factory set such that the
display reads the distance from the bottom of the transmitter to
the liquid surface. This is also referred to as the Air distance (Air
Mode). As the level of liquid increases, the display will decrease
and vice versa. Conversely, the transmitter may be set to read the
actual height of liquid in the tank (Liquid Mode). Below, a tank
height of 100” will display 40.0, which represents 40.0” of air in
the AIR Mode. In the Liquid Mode, the display will change to
60.0, which represents 60.0” of liquid.
AIR MODE LIQUID MODE
E. Change Display Mode: To change the display to indicate
the height of liquid, follow the instructions below:
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When UNITS appears, press the SELECT/FAST button. The dis-
play will rotate between INCHES, CM, PERCENT and
DISPLAY.
3. When DISPLAY appears, press the SELECT/FAST button. The
display will rotate between AIR or LIQUID.
4. When LIQUID appears, press the SELECT/FAST button.
You have successfully programmed the LIQUID mode.
F. Programming Off Tank: If you know the dimensions of your
tank, you may input the 4 mA and 20 mA set points manually without
performing target calibration (requiring you to raise and lower the
liquid level). To do so, review the following:
HEIGHT: The point in inches or centimeters from the transducer
face where the output will be 4 mA (generally the bottom of the
tank). Factory default is the same as the unit’s maximum range.
Example UCL-520 = 314” maximum range which is also the same
4 mA set point under factory default.
FILL H: The point in inches or centimeters from the bottom of the
tank to the high level where the output will be 20 mA (generally the
straight wall distance from the bottom of the tank). NOTE: The
transmitter dead band is automatically subtracted from the FILL H.
Example: UCL-520 = 8” dead band. Therefore the maximum FILL
H is 314” [maximum range] - 8” [dead band] = 306”.
PROGRAMMING
SELECT
FAST
SELECT
FAST
SELECT
FAST
4 mA
20 mA
20 mA
4 mA
SELECT
FAST
SELECT
FAST
SELECT
FAST
UP
DOWN
SELECT
FAST
SELECT
FAST
SELECT
FAST
UP
DOWN
Step Ten
G. Programming HEIGHT: To change HEIGHT 4 mA value.
PROGRAMMING
Step Eleven
I. Programming REV mA (Optional): In factory default, the
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When TANK appears, press the SELECT/FAST button. The dis-
play will rotate between HEIGHT, FILL H and REV mA.
3. When HEIGHT appears, press the SELECT/FAST button. The
display will show a decimal reading in the selected UNITS.
4. Press the UP/DOWN buttons to increase or decrease this value to the
distance from the transducer face to the bottom of the tank. NOTE:
Simultaneously holding down the SELECT/FAST button while press-
ing the UP or DOWN button will increase the speed of the display.
5. When you have reached the desired value, press SELECT/FAST
to SAVE.
H. Programming FILL H: To change FILL H 20 mA value.
Normal mA Mode
MaxR (4 mA) set at empty tank
and MinR (20 mA) set at full tank.
Reverse mA Mode
MaxR (20 mA) set at empty tank
and MinR (4 mA) set at full tank.
transmitter operates with 4 mA at the maximum range (MaxR), and
20 mA at the dead band (MinR). Using the menu item REV mA, you
can change the unit to reverse this to 20 mA at the furthest distance
(MaxR) and 4 mA at the closest distance (MinR).
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When TANK appears, press the SELECT/FAST button. The dis-
play will rotate between HEIGHT, FILL H and REV mA.
3. When FULL H appears, press the SELECT/FAST button. The
display will show a decimal reading in the selected UNITS.
4. Press the UP/DOWN buttons to increase or decrease this value to
the distance from the bottom of the vessel to the full point (typi-
cally the straight wall height).
5. When you have reached the desired value, press SELECT/FAST
to SAVE it.
You have successfully programmed the FILL H or 20mA value.
NOTE: You can increase the speed at which the display changes
by pressing the SELECT/FAST button while simultaneously hold-
ing down the UP or DOWN button.
NOTE: You must set HEIGHT and FULL R prior to reversing the
4 and 20 mA. Regardless of which mode you are in (Norm or
Rev), changes to the HEIGHT or FULL R are always with
respect to the original settings programmed.
NOTE: Any changes to the HEIGHT will effect the FULL R
value. The FULL R will stay at the same physical level in the
tank. An increase to the HEIGHT value will result in an equal
increase to the FULL R value. A decrease to the HEIGHT value
will result in an equal decrease to the FULL R value.
PROGRAMMING
SELECT
FAST
SELECT
FAST
SELECT
FAST
SELECT
FAST
SELECT
FAST
SELECT
FAST
SELECT
FAST
SELECT
FAST
EMPTY
FULL
Step Twelve
PROGRAMMING
Step Thirteen
J. Programming SAFE Mode: To change SAFE mode.
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When SAFE appears, press the SELECT/FAST button.
3. The display will now rotate through 22mA, 21mA, 20mA, 4mA
and HOLD. When you reach the desired setting, press the
SELECT/FAST button to SAVE it..
You have successfully programmed the SAFE mode.
K. Programming Target Calibration (Optional): The
transmitter’s 4 mA and 20 mA set points can be target calibrated ON
the tank by raising and lowering the liquid level, or OFF the tank
using the distance to a flat reflective target such as a wall. Generally,
target calibration is done ON the tank. To do so, follow the EMPTY
and FULL tank programming steps on the next page.
L. Programming TG CAL EMPTY Tank: With the tank
EMPTY or the liquid in a low level state, apply power to the transmit-
ter. Begin programming after WARMUP.
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When TG CAL appears, press the SELECT/FAST button. The
display will rotate between FULL and EMPTY.
3. When EMPTY appears, press the SELECT/FAST button. WAIT
will be displayed followed by SAVED.
You have successfully programmed the EMPTY or 4 mA value.
M. Programming TG CAL FULL Tank: With the tank FULL,
or the liquid in a high level state, apply power to the transmitter.
Begin programming after WARMUP.
NOTE: A transmitter installed on a tank operating in the factory
default RUN mode will display the distance from the bottom of
the sensor to the liquid surface. The value will decrease as the
tank is filled or increase as the tank is emptied. Make sure that
you do not overflow the tank or completely empty the tank while
moving the liquid level to the desired high or low set point dis-
tance for target calibration.
TG CAL: Allows the user to use an unknown distance for setting
of the 4 mA and 20 mA span.
FULL: Target calibration technique that allows the user to enter
the present distance from the
transducer face to the liquid or a
reflective target as the 20 mA
(FULL) set point
EMPTY: Target calibration
technique that allows the user to
enter the present distance from
the transducer face to the liquid
or a reflective target as the 4 mA
(EMPTY) set point.
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When TGCAL appears, press the SELECT/FAST button. The
display will rotate between FULL and EMPTY.
3. When FULL appears, press the SELECT/FAST button, WAIT will
be displayed followed by SAVED.
You have successfully programmed the FULL or 20 mA value.
Note: The display will now indicate LEVEL height in the RUN
mode.
INSTALLATION
WIRING
Step FifteenStep Fourteen
Do not install at
angle relative
to the liquid
Do not install
with objects
in the beam
Do not install
within 3” of
tank side wall
Do not install
in applications
with vacuum
VACUUM
Warning
Gems ultrasonic transmitters have been optimized for use in
non-metallic fittings. Avoid the use of metal fittings.
Install the appropriate installation fitting. Make sure that the fitting and transmitter threads are not damaged or worn. Install the
transmitter with the included Viton mounting gasket. Hand
tighten the transmitter within the fitting. Perform an installed
leak test under normal process conditions prior to system start
up.
A. Wiring to a Typical Two-Wire Loop Powered Indicator
(+)
SHIELD
(-)
DC Power
Supply
12-28 VDC
- ++ -
B. Wiring to a Typical PLC
(+)
Shield
(-)
DC Power
Supply
12-28 VDC
+ -
6
5
4
3
2
1
0
A
TYpical PLC
A. Fitting Selection: Check the transmitter part number to deter-
mine the required 2” fitting thread type. The transmitter is commonly
installed in tank adapters, flanges, brackets or stand pipes.
Gasket
Adapter
Flange
Height
Inner Diameter
Ventilation
Hole
Stand Pipe
1. Adapter: Select a tank adapter fitting with
minimal height so as to ensure that the
installed transducer will not be substantially
elevated into the fitting. Avoid tank adapter
styles with threads and/or pipe stops forward
of the installed transducer.
2. Flange: Tall flanges with narrow risers
impede the acoustic signal. Select a fitting
with the right riser height versus inner diameter geometry. The transmitter may be elevated up to 12” (30 cm) in a 6” (15 cm) riser, 8”
(20 cm) in a 4” (10 cm) riser and 3” (7.6 cm)
in a 2” (5 cm) riser.
3. Stand Pipe: A stand pipe may be used to
Riser
dampen turbulence or separate surface foam.
Select a minimum 3” pipe for the stand pipe.
The pipe length should run the measurement span. Cut a 45° notch at the bottom of the pipe and drill a 1/4” pressure
equalization hole high in the dead band.
Dead Band
Highest
Liquid Level
3" Minimum
Diameter
Operational Range
Lowest
Liquid Level
SELECT
FAST
SELECT
FAST
SELECT
FAST
TROUBLESHOOTING
Transmitter
UCL-520
4 mA Setting
26.2’ (8m)
20 mA Setting
8” (20 cm)
Factory Set Points
SELECT
FAST
SELECT
FAST
SELECT
FAST
SELECT
FAST
SELECT
FAST
SELECT
FAST
TROUBLESHOOTING
Step SeventeenStep Sixteen
A. Viewing Programmed VALUES:
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When VALUES appears, press the SELECT/FAST button. The
display will rotate between SETUP, DIAG and RESET.
3. When SETUP appears, press the SELECT/FAST button. You will
now begin viewing calibration settings (UNITS, Display, MinR,
MaxR and SAFE) that are programmed in the transmitter.
When complete the display will revert back to the VALUES menu.
B. Viewing DIAGNOSTICS:
C. Factory RESET:
1. Press the SELECT/FAST button and hold it for 5 seconds until
PROG appears.
2. When VALUES appears, press the SELECT/FAST button. The
display will rotate between SETUP, DIAG and RESET.
3. When RESET appears, press the SELECT/FAST button. The
display will rotate between YES or NO.
4. When YES appears, press the SELECT/FAST button.
Note: FACTORY RESET resets the transmitter back to its original factory default settings: (20 mA = Minimum Range, 4mA =
Maximum Range and SAFE = 22mA).
D. Testing the Transmitter
1. Press the SELECT/FAST button and hold it for 5 seconds until
2. When VALUES appears, press the SELECT/FAST button. The
3. When DIAG appears, press the SELECT/FAST button. You will
PROG appears.
display will rotate between SETUP, DIAG and RESET.
now begin viewing diagnostic values (LEVEL, TEMP ECHO,
POWER, MOUNT and VER) that may be relevant to the trans-
mitter and it’s performance in your application.
When complete the display will revert back to the VALUES menu.
1. Connect a multi-meter in transmitter with the black wire to read
the current output.
2. Verify that the current increas-
es (tank filling) and decreases
(tank emptying) appropriately
in the calibrated span.
Power
Supply
456
Power
Supply
192021
mA
mA
3. If not, carefully observe and
attempt to correlate any instal-
Black
Red
Black
Red
lation, level or application
event for more specific trou-
bleshooting.
20 mA
4. Write down the information in
DIAGNOSTICS (LEVEL,
TEMP ECHO, POWER,
4 mA
MOUNT and VER) and have it
ready when you contact your
Gems representative.
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