Vaisala WAA151 Installation Manual download pdf (Page 115)

Chapter 4 ________________________________________________________________ Installation

VAISALA _______________________________________________________________________ 113

Fuel Moisture Sensor

CAUTION

It is important to keep the wooden dowel part of the sensor clean.

Avoid touching the dowel with bare hands. Any contact with grease

or oil will prevent the sensor from exchanging moisture and will

make the calibration invalid.

QFM101 Fuel Moisture Sensor uses two analog channels of the

logger: one for the temperature measurement and another for the

moisture measurement. Moisture is measured via one of the channels

CH1 to CH3. You should connect the sensor cable to the appropriate

channel. Temperature is measured with one of the channels CH4 to

CH7 and therefore you should modify the wiring as instructed below.

You should install the QFM101 sensor 30 cm above the forest floor

and orient the sensor parallel to the ground. The mounting bracket (1

in Figure 109 below) is not included in the sensor delivery. A rubber-

lined ring clamp (3) and the screw (4) are included with the sensor in

the package. To install the sensor, follow the procedure below:

1. Slide the ring clamp (3) onto the sensor body (2) and connect

the cable to the sensor.

2. Turn the sensor so that the two wire loops imbedded in the

wooden dowel will be horizontal. That is, the wires must be on

the sides of the sensor, not the top and bottom. Tighten the

clamp with the screw (4).

0201-041

Figure 109 Installing the Sensor with the Clamp

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Vaisala WAA151 Installation Manual Page 115