General guidelines
Relative humidity is extremely dependent on temperature. Proper measurement of relative humidity requires that the probe and its sensors be at exactly the temperature of the environment to be measured. Because of this, the location where you choose to install the probe can have a significant effect on the performance of the instrument. The following guidelines should guarantee good instrument performance:
Select a representative location: install the probe where humidity, temperature and pressure conditions are representative of the environment to be measured.
Provide good air movement at the probe: air velocity of at least 200 ft/ minute (1 meter/second) facilitates adaptation of the probe to changing temperature.
Avoid the following: (1) Close proximity of the probe to a heating element, a cooling coil, a cold or hot wall, direct exposure to sun rays, etc. (2) Close proximity of the probe to a steam injector, humidifier, direct exposure to precipitation, etc. (3) Unstable pressure conditions resulting from excessive air turbulence.
Immerse as much of the probe as possible in the environment to be measured.
Prevent the accumulation of condensation water at the level of the sensor leads: Install the probe so that the probe tip is looking downward. If this is not possible, install the probe horizontally.
Type D/F – through wall mount
Part AC5005 is a flange with compression fitting that is designed to hold the probe of the HF1 type D/F when mounted through a wall. The HF1 does not require any additional support. The AC5005 allows easy installation and removal of the HF1. To avoid measurement errors, at least 50 mm of the probe should be inserted into the environment that is to be measured. If necessary, use the mounting fl ange AC5005 to install the probe and fasten the transmitter.
Type W – surface mount
Hold and align the lower case to the wall. Drill two holes through the case into the wall using a 4 mm drill or a scratch awl. A drill mark in the wall is enough. Remove the lower case and drill a hole in the wall with a 5 mm drill (at least 3 cm deep) Insert the plugs delivered with the device, add the washer to the screws and mount the transmitter with the screws (2 screws) to the wall. The washers are used to seal the screw against the housing.
