19
Extension Cables
There is no problem extending the anemometer/wind vane cable or
optional rain gauge cable to 250 feet or more. Be sure the extension
cable used is correctly wired - if in doubt, proper 40' Extension Cables
may be obtained from Peet Brothers Company.
The Outdoor Temperature Sensor cable length should be kept as
short as practical, but extension up to 100 feet will not degrade
performance.
Normally it is best not to extend the total cable length from the
temperature sensor to the keyboard display unit any more than
necessary. Longer cables tend to decrease the temperature reading
slightly. For example, a total length of 265 feet (using six 40-foot
extension cables) can decrease temperature readings about 1.5
°
F.
This applies only to temperatures above about 60
°
F; measurements
of temperatures below 60
°
F are unaffected by long cable lengths.
Instead of extending more than one sensor cable, it may be possible
and more economical to place the junction box further from the
keyboard/display unit, using a 40' Junction Box Extension Cable.
NOTE:
If you plan to use a sensor extension cable that will be joined
outside, you must waterproof the connection.
20
IV. INSTALLING YOUR ULTIMETER 100 COMPONENTS
Installing the Anemometer
1. Slide the locking ring up as far as it will go on the fingers.
2. Place the anemometer/wind vane over the top of the mast with
all four fingers on the outside of the mast.
3. Slide the clamping ring down over the fingers until you start to
feel significant resistance.
4. Find the North Calibration Mark on the anemometer (this is the
small silver line located near the screw head - see illustration
below). Rotate the anemometer on the mast until the calibration
mark is facing due north. Use a compass or other directional
reference.
Tip: Use a piece of tape to hold the wind vane pointed in the
direction of the silver mark, and use the wind vane pointer to help
to install the anemometer in the correct position. Rotate the
anemometer on the mast until the wind vane points North
(remember to remove tape!).
North Calibration Mark
5. Firmly clamp the anemometer in place by repeatedly pulling the
locking ring down, first a little on one side, then a little on the
opposite side, keeping it more or less level, until you can't pull it
down any further.
6. Using the cable ties provided, secure the cable to the mast.
One tie should be placed just about 2 in. below the
anemometer/wind vane. The other two should be evenly spaced
below that.
