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long as the fluid being sampled is sufficiently conductive enough. Also, if the fluid causes the inside of
the sensor body to be coated, the sensor may not properly detect the presence fluid.
The ultrasonic fluid sensor detects the presence of fluid by transmitting sound waves through the
fluid. Because sound travels better through a fluid than through air, the sensor can detect if fluid is
present or not. The ultrasonic fluid sensor works in most applications. It does not make physical
contact with the fluid, and is not affected by the fluid’s conductivity or temperature. Air bubbles in the
fluid can cause the sensor to not detect fluid reliably, as they reduce how well sound travels through the
fluid.
Connecting the Sampler to an External Device.
Manning samplers can be operated using inputs from external devices such as flow meters and
Programmable Logic Controllers (PLC’s) to trigger samples. A 4-pin female panel connector is located
on the sampler chassis and is used in conjunction with a cable to make the connections.
Samplers come standard with a 3-foot cable. A 10-foot cable is available as an option.
BLACK- GROUND
GREEN- 4-20mA IN -
WHITE- 4-20mA IN +
CABLE
MS818016 (3')
MS818018 (10')
4-PIN FEMALE
PANEL CONNECTOR
PANEL MOUNT CONNECTOR
FRONT VIEW
PIN B GROUND
PIN C 4-20mA -
PIN D 4-20mA +
RED- CONTACT IN
PIN A CONTACT IN
SAMPLER
Figure 2.
To use a contact closure, connect your device to the red and black wires on the cable. For a 4-
20mA input, connect your device to the green (negative) and white (positive) wires. The contact closure
must have a minimum duration of 250 milliseconds. Most devices that provide the contact closure are
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