Description; General; Main Parts; Moving Parts - Observator Instruments OMC-150 Manual

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Description

2.1 General

While reading this chapter please refer to the dimensional drawing in Appendix C:For detailed
specifications please refer to Appendix B:

2.2 Main parts

The OMC-150 anemometer consists of a sensor body and a mounting bracket. Note that the mounting
bracket, though it is sometimes referred to as OMC-157, is an integral part of the OMC-150 anemometer.
The mounting bracket has a mast clamp and an electrical plug connector. This clamp is designed for
mounting on a vertical pipe end.

2.3 Moving parts

The only moving parts are the cup unit and the vane unit. The vane unit is mounted on top of the sensor
body, and the cup unit is mounted under the sensor body. Both the cup unit and the vane unit are wind
driven. The wind speed sensor is a rotary cup type unit manufactured in stainless steel and polycarbonate.
The three cups are cone shaped for optimum response to varying winds. The vane unit is made in
stainless steel.

2.4 Electrical

The electrical circuit for wind speed measurement and the electrical circuit for wind direction measurement
are not interconnected. The speed sensor is a proximity switch with a 2-wire "NAMUR" signal on
connections E and F; the direction sensor is a dual wiper potentiometer with a 360 degree winding (no
gap). It has two supply connections A and B, and two wiper connections C and D. For details see section
3.3.

2.5 Layout of a wind system

The following accessories are supplied with the OMC-150 anemometer:

pigtail cable with mating connector to the OMC-150 anemometer

U-bolts with small mounting materials
In order to build a complete wind system, the following components may be required. These components
must be ordered separately:

OMC-156 Junction box for cable extension

Field cabling

OMC-158 interface unit

Calibration certificate (see also section 0)
Manual | OMC-150
Status: Final | Not confidential
Page 9 | 38
V2.13