HF scientific Oil Content Monitor - Manual (Page 9)

OCM Rev. 3.9 (1/03) 3
3.0 Installation
3.1 Mounting and Site Selection
The OCM is designed for wall mounting. If wall mounting is not practical, the
instrument can be mounted on any suitable surface. Choose a location that is easily
accessible for operation and service and ensure that the front display rests at eye level.
The overall mounting dimensions of the instrument are shown in Figure 1. For ease of
service there should be about 45cm (18”) free area above the OCM. This will ensure
enough room for calibrations and for cleaning the optical well. The recommended
mounting screws (four required) are M6 (or ¼”).
It is important that the OCM be mounted within 18 meters of the oily water separator to
comply with the IMO requirement for a response time of 40 seconds.
3.2 Plumbing
The recommended plumbing for the instrument is shown in Figure 4. The OCM is
designed with an integral flow regulator which limits the flow to between 0.8 – 1.3
liters/minute depending on the system backpressure. Ensure that you supply the OCM
with a process flow capable of sustaining these levels. Quick-connect fittings are supplied
on the inlet and outlet of the OCM. These fittings help speed up calibration procedures.
The OCM is designed for use with semi-rigid tubing (¼” OD X .170” ID). Opaque
tubing is recommended if the tubing will be exposed to sunlight. Using this semi-rigid
tubing, the instrument should be installed within 18 meters of the sample line to comply
with the IMO requirement for a response time of 40 seconds. A valve is supplied at the
inlet side of the instrument to ease the calibration and cleaning procedures.
Note: The quick-connect fittings are designed with a special shut-off feature to prevent
flow of the process through the OCM when the line is disconnected.
The optional clean water supply must be oil-free. The clean water connection, along with
the optional drain connection, allows the OCM to be easily calibrated for the clean water
condition. If your clean water supply is seawater, the OCM can be zero adjusted with the
local seawater.
3.3 Electrical Connections
All of the electrical connections to the OCM are made at the field terminal box located on
the lower section of the instrument. Wiring should be run in through the grommet closest
to the connection terminal block. The cable diameter for these grommets is rated for 4.3 –
11.9 mm (0.170 –0.470”).
To make connections, insert a 3mm(1/8”) flat blade screwdriver into the top slot of the
terminal block. Pivoting the handle of the screwdriver up causes the clamp to lower. You
can now insert the wire. Releasing the tension raises the clamp and tightens the
connection. Please note that these terminal blocks will accept wire gauges AWG 24-14.
As you read the following sections, please refer to Figure 3 for clarification of the
electrical connections.
Please follow all local and government recommendations and methods for installation of
electrical connections to and between the instrument and peripheral devices.