Greyline Instruments LIT25 Operating Manual
www.greyline.com
USER'S GUIDE
Installation & Operation
Instructions
Level Indicating Transmitter
Model LIT25
Manual Series 3.5.3
Note: This page has been left blank intentionally.
LIT25 Level Indicating Transmitter
INDEX
QUICK BENCH TEST ............................................................................................4
CONNECTIONS .....................................................................................................4
KEYPAD SYSTEM.................................................................................................6
MENU ......................................................................................................................7
CALIBRATION UNITS SELECTION ...................................................................8
4mA CALIBRATION .............................................................................................9
SIGNAL RELAY...................................................................................................10
DAMPING .............................................................................................................11
ECHO LOSS RESPONSE .....................................................................................11
OUTPUT SIMULATION ......................................................................................12
STORE (SAVE) CALIBRATION .........................................................................12
TEMPERATURE DISPLAY.................................................................................13
ENCLOSURE INSTALLATION ..........................................................................14
SENSOR MOUNTING .........................................................................................15
ERROR/WARNING MESSAGES ........................................................................18
FIELD TROUBLESHOOTING ............................................................................19
APPLICATIONS HOTLINE .................................................................................22
PRODUCT RETURN PROCEDURE ...................................................................23
APPENDIX A ........................................................................................................25
APPENDIX B ........................................................................................................31
CONVERSION GUIDE ........................................................................................33
SPECIFICATIONS ................................................................................................34
IMPORTANT NOTE: This instrument is manufactured and calibrated to meet product specifications.
Please read this manual carefully before installation and operation. Any unauthorized repairs or
modifications may result in a suspension of the warranty.
Available in English
Available in Adobe Acrobat pdf format
Disponible en français
Disponible en español
Page 3
LIT25 Level Indicating Transmitter
QUICK BENCH TEST:
Connect Sensor as shown below, then apply Power. When properly connected a soft clicking can be
heard from the sensor and figures will show on the LCD display. Test operation of the LIT25 by holding
the sensor steadily and aiming at a flat, stable target 12 to 28" (305 to 711 mm) away from the end of the
sensor. Allow a few seconds for the LIT25 to lock onto the target before displaying its distance. The
LIT25 will now display range in inches or cm.
Note: The LIT25 will not detect targets beyond the user entered maximum range.
CONNECTIONS:
POWER INPUT: The standard model requires AC power input between 100 to 130VAC 50/60Hz (1
amp fuse is recommended). No adjustments are necessary for any voltage in this range. Option EI rating
is 100-240VAC 50/60Hz. (See OPTIONS section of this manual for connection of optional 24VDC
power input).
IMPORTANT NOTE: To comply with CSA/NRTL standards, AC power input and relay connection
wires must have a water tight fitting conduit entry to the instrument enclosure.
14 AWG MAX
LINE
GROUND
NEUTRAL
IMPORTANT:
MUST CONNECT TO A
GOOD GROUND ( 1 Ohm)
WITH 14 AWG CONDUCTOR
GND
<
RELAY
(1 AMP)
CONNECT SHIELD
TO GROUND
(THIS END ONLY)
4-20mA
+
–
CURRENT SOURCE
SENSOR
TO SENSOR
RG62AU COAXIAL
DO NOT POWER LOOP
Page 4
LIT25 Level Indicating Transmitter
RECOMMENDED CONDUIT ENTRY
Use a screwdriver to "knock-out" conduit entry points at bottom of enclosure.
Use one entry for power input and relay wires. Use separate entry for 4-20mA and sensor cable.
Page 5
LIT25 Level Indicating Transmitter
KEYPAD SYSTEM
The LIT25 has a simple 2-key calibration system. Operating and calibration modes are shown on the 4digit display. The keys are used to calibrate the LIT25, and to view operating mode and functions. If the
keys are not used for 10 minutes, the LIT25 will automatically go to NORMAL MODE. Except in
OUTPUT SIMULATION mode, the Relay and 4-20mA output are not affected by use of the keys until
your calibration is stored.
PERCENT INCHES CM
ECHO
RELAY
4-DIGIT LCD DISPLAY
CALIBRATION KEYS
LIT25
LEVEL INDICATING TRANSMITTER
POWER
CONNECTION
+–
GND
SENSOR
CONNECTION
4-20mA
CONNECTION
MENU - FLOW CHART
The following diagram shows the LIT25 Menu system. Arrows show the directions to leave a box.
Pressing a corresponding key will move to the next box in the direction shown. Numeric values are
changed by pressing and holding the or keys.
At the bottom of the Menu is a YES? prompt. To store the calibration values permanently (even through
power failure), press the key. If the key is pressed from the YES? prompt no changes will be
stored and the system will return to NORMAL mode.
Page 6
MENU
23c
TEMPERATURE
Displays Temperature at Sensor
LIT25 Level Indicating Transmitter
See Page #
13
638.6
RANGE CM
123.4
LEVEL CM
CALU
PERCENT INCHES CM
4=
20 =
roc1
3,5 1,2,4
ron
r oFF
dp10
762.0
CM
40.6
721.4
706.9
RANGE DISPLAY
Displays Distance from Sensor to Target
(Does not affect 4-20mA output or Relay)
NORMAL MODE
CALIBRATION UNITS SELECTION
Press Ç to select inches, cm or percent
4mA and 20mA CALIBRATION
Wait for the Numeric value then press ÇÈ
or decrease. Value displayed is Distance from the Sensor
in inches or cm.
CM
RELAY OPERATION CHOICE
Press Ç to select:
1 = Level Alarm
2 = Level + Echo Loss
CM
CM
RELAY SET POINTS
Wait for Numeric value and press
adjust Set Points (in Units selected, or
DAMPING (0 - 20 SECS. )
Press to AdjustÇ
È
3 = Echo Loss Only
4 = Temperature Alarm
5=Off
or to increase
for Next FunctionWaitfor4=or20=andPress
ÇÈand to
C).°
13
8
8
9
10
11
Sb=n
ELC 1
-C.S-
YES?
YES
NO
Press Ç to select "Y" (Yes) only when the instrument is
equipped with an optional Intrinsic Safety Barrier for
sensor mounting in hazardous locations. This setting
compensates for the electrical characteristics of an
Intrinsic Safety Barrier.
ECHO LOSS CHOICE (4-20mA OUTPUT)
Press to Select action when echo lost
Ç
1 - Hold 2 = Go to 4mA 3 = Go to 20mA
0.0OPSL
CM
OUTPUT SIMULATION
Wait for Numeric value and press or to Increase
or Decrease Simulated Output
(Automatically returns to NORMAL mode in 10 min.).
STORE YES?
Press to Store Calibration (Displays -C.S.-)Ç
Press Calibration Not StoredÈ
ÇÈ
11
11
12
12
Page 7
NORMAL MODE
LIT25 Level Indicating Transmitter
Flashes when good echoes
are received
ECHO
LEVEL CM
When Calibrated
for 20mA at
Maximum Range
4mA =
20mA =
When Calibrated
for 20mA at Minimum Range
(Maximum Level)
CALIBRATION UNITS SELECTION
Press from NORMAL mode, Display will show:
RELAY
ON - Relay energized
OFF - Relay de-energized
20mA =
4mA =
PERCENT INCHES CM
È
4-20mA
CALIBRATION
Ç
PERCENT
Ç
INCHES
Ç
CM
Page 8
Echo light keeps flashing
to show instrument
still operating
4mA CALIBRATION
LIT25 Level Indicating Transmitter
The Display will alternate between
È
20 =
MAXIMUM VALUES: 600 inches / 1524 cm
MINIMUM VALUES: 8 inches / 20.3 cm
MINIMUM SPAN (distance between 4= and 20=): 2" (5 cm)
and
È
761.9
È
761.8
È
761.7
every 3 seconds.
Ç
762.1
Ç
762.2
Ç
762.3
20mA CALIBRATION
Wait for 4 = and press to display 20 =. Now follow the same procedure to calibrate the distance from
the Sensor for 20mA output.
Remember that the LIT25 automatically reads LEVEL if 20 = is set to the minimum distance from the
sensor. Calibrate in RANGE mode by setting 20= to the maximum distance from the sensor.
20mA =
4mA =
LEVEL
(Inventory)
12"/30.5cm
2"/5cm
RANGE
(Outage)
12"/30.5cm
4mA =
2"/5cm
20mA =
Page 9
SIGNAL RELAY
LIT25 Level Indicating Transmitter
The LIT25 Relay is rated 1ampere, 24VDC, 120/240VAC. It includes an internally
connected noise suppressor or “snubber” with 25K ohms impedance. Very low AC
electrical loads may appear to “leak” current.
Maximum leakage is:
10mA @ 110VAC
20mA @ 220VAC
No leakage will be measured with DC electrical loads.
RELAY OPERATION CHOICE
The LIT25’s Signal Relay can be configured to operate as:
ROC1 = Level Alarm
ROC2 = Level + Echo Loss Alarm
ROC3 = Echo Loss only Alarm
ROC4 = Temperature Alarm (measured at the Sensor)
È
ROC = 3,5
È
ROC = 1,2,4
ROC5 = OFF (de-energize) at all times
Press to select the ROC.
RELAY CALIBRATION
ROC1 (Level Alarm)
INTERNALLY
CONNECTED
SUPPRESSOR
È
È
RELAY
(1 AMP)
Ç
ROC2
Ç
ROC3
Ç
ROC4
The Display will alternate between
È
Ç
and
È
721.3
È
721.2
È
721.1
every 3 seconds
Ç
0.0
Ç
0.1
Ç
0.2
ROC2 (Level + Echo Loss Alarm) - Relay will be energized when the Relay ON set point is
reached.
or if the echo is lost (no echoes for more than 20 seconds).
ROC4 (Temperature Alarm) - Minimum Set Point -40°C (= -40°F)
- Maximum Set Point 100°C (= 212°F)
NOTE: The Set Points are displayed in the units selected at CALU. Two different Set Points (RON and
ROFF) allows a Relay “deadband” for Pump Control and to avoid Relay chatter.
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LIT25 Level Indicating Transmitter
Example of Relay Calibration
Span (Max Level) = 184 inches
RON in inches = 150
ROFF in inches = 30
RON
R OFF
DAMPING
Normal Setting: DP10
Fast Response (up to ½ inch /13 mm level change per
second): DP5 or less
Slow Response (turbulence) DP15 or more
NOTE: Damping Time (in seconds) is the response time to
indicate a new target. Longer Damping Times also reject false
targets like agitators, splashing etc.
SENSOR
30"
È
150"
SPAN
Ç
DP11
Ç
DP12
20mA = 16"
4mA = 200"
20 SECS.
MAXIMUM
INTRINSIC SAFETY BARRIER
Press to select "Y" (Yes) only when the instrument is equipped with
an optional Intrinsic Safety Barrier for sensor mounting in hazardous
locations. This setting compensates for the electrical characteristics of an
Intrinsic Safety Barrier.
ECHO LOSS RESPONSE
If no echoes are received for 20 seconds or longer the 4-20mA output can
be programmed to respond as follows:
ELC1 = Hold last reading
ELC2 = Output 4mA
ELC3 = Output 20mA
When one valid echo is received the LIT25 will resume normal operation.
È
Ç
Ç
Y
Ç
ELC2
Ç
ELC3
Page 11
OUTPUT SIMULATION MODE
LIT25 Level Indicating Transmitter
The Display will alternate between
È
Ç
and
È
721.4
È
721.3
Ç
0.1
Ç
0.2
The Output Simulation function controls the digital display 4-20mA output and control relay. Use it to
simplify calibration of remote 4-20mA devices such as chart recorders or remote displays, and to test
relay set-points.
Press and to simulate levels from 0% to 100% of your calibrated span. Increments will
automatically accelerate when or is continuously pressed.
STORE (SAVE) CALIBRATION
È
RETURN TO
NORMAL MODE
Ç
CALIBRATION
STORED
Press to Store calibration (LIT will display -C.S-).
Calibration is stored in non-volatile memory (even through power interruptions).
Press to return to NORMAL mode without storing any changes.
Page 12
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