ADM-870 05/23/0826
each of the switch positions. Careful recording of which switch position readings are entered into memory under
which sequence tag is essential to accurate recall of readings for performance calculations.
FIGURE 8.2 AIRDATA MULTITEMP
Additional points may be measured in the same measurement sequence by using more than one MultiTemp
switch unit connected in series (piggybacking). Reading and memory entry of 64 temperature points would take
about two minutes (after temperature probes have stabilized).
The temperature probes used with the MultiTemp and AirData Multimeter are typically interchangeable to within
0.4
/ F. These probes may be used in any liquid or gas compatible with stainless steel. Typical uses include:
wet or dry bulb air temperatures; thermometer wells; "Pete's" plugs; or direct immersion. Some applications
include: humidity control systems; direct expansion A/C systems; outside air adjustment; hot water heating;
chilled water; condenser water; and many other circulating process liquid systems. The surface probes may
be used to measure pipeline surface temperatures when piping systems do not have thermometer wells. These
probes may also be used as fast acting air probes.
NOTICE: The use of more than one MultiTemp and temperature cable extender set may reduce the meter
reading by a non-linear degree depending on the combination of cable type, length and TemProbe temperature.
This is due to the added resistance of the additional MultiTemp(s) and cable(s). This effect is likely to be
negligible at very low temperatures, but may be
$ 0.25/ F per additional MultiTemp and cable extender at 154/
F. The offset correction(s) must be determined by comparing readings taken with and without the additional
MultiTemps and extender cables at the temperature(s) to be measured.
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