2 4 . 0
V
+
-
24VDC POWER SUPPLY
DIGITA
L MULTIMETER
100 SERIES SENSORS
Note: Use caution when sealing the cable at the top of the tank. There is a
ventilation/reference tube located within the cable. The purpose of this tube is
provide a comparison between atmospheric pressure and the pressure that is being
exerted on the sensing diaphragm within the tank. The reference tube must be open
and free to allow air to flow back to the pressure diaphragm. Avoid blocking or
bending the ventilation tube by compressing the cable. Always keep the cable
termination clean, dry and free of moisture and prevent liquid from entering the vent
tube. The LP100 Installation Junction Box comes with a Gortex breather to allow for
air to pass but not moisture. It also has the cable grip located at the bottom to
secure the sensor.
Avoid installations where other tank requirements will cause the transmitter to move or swing.
Example: A mixer blade could cause the level transmitter to whip around within the tank. An
alternative would be to move the transmitter to a more stable section of the tank or to install the
Transmitter inside a still well/drop tube. This will minimize the effects created by the mixer.
Termination: The cable for the transmitter is typically terminated at a junction box located on top of
the tank. Since the vent tube is contained within the cable, the pressure within the junction box
must always be the same as the reference (typically atmospheric) pressure for the liquid. The
inside of the function box must be clean, dry and free of moisture. (A descant can be provided)
Add the optional fitting LP 100 to complete the package. The LP 100 features a 2" NPT thread for
mounting and a liquid tight connector to seal the cable interface, and a Gortex breather that allows
for the transfer of air, but not moisture.
After final installation of the Levelpro transmitter and its companion receiver (TruVu), no routine maintenance is required. A
periodic check
of
system calibration is suggested. Be sure to include a brief description of the problem plus any relevant application notes. Contact
customer service to receive a return goods authorization number before shipping.
Maintenance s
hould consist of inspection to see that the transmitter is free from debris and not coated with any substance, which would
prevent liquid from freely entering and leaving the transmitter. If this occurs, the transmitter should be cleaned.
If transmitter is not functioning properly, isolate the transmitter from
the system and wire as shown below. Be sure to remove the sensor
from the classified area when preforming this test. Multi - Meter
should read 4mA with the transmitter out of liquid.
1. First, verify that the sensor is wired correctly.
2. Next, check if the power supply is providing the required power.
3. Finally confirm that the loop resistance is not exceeding the sensor's specification.
10. MAINTENANCE
Testing the Transmitter:
200
2000k
200k
E
B
C
C
B
E
E
NPN
PNP
E
20k
2000
200
hFE
2000
20
200
200
750
200
2000
20
200
1000
m
m
V
V
~
10A
OFF
4.0
24V
4mA
4-20mA Output
Cable Grip
Gortex Breather
Continuous Submersible Level Transmitter
Levelpro-Sensors Manual
09
Vaporbloc
®
Com
mA
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