ADM-880C 07/20/09
41
The automatic reading function may be used with the MultiTemp. Set the meter for automatic readings and take as many
readings as needed for any of the switch positions. Press the READ key to halt the reading process prior to changing switch
positions. Changing switch positions during the actual reading process will cause false readings.
FIGURE 8.2 AIRDATA MULTITEMP
The individual and automatic storage functions may also be used with the MultiTemp. Set the meter for the individual
storage or automatic reading storage functions as needed. Take as many readings as needed for 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.
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). Connect the primary MultiTemp module to the meter as described above.
Connect the output jack of each secondary MultiTemp to the input jack of the primary MultiTemp using plug adapter P/N
PA-447. Each switch position of the primary MultiTemp can support up to eight switch positions on a secondary MultiTemp.
The temperature probes used with the MultiTemp and AirData Multimeter are typically interchangeable.
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.
Summary of Contents for AIRDATA ADM-880C
Page 42: ...ADM 880C 07 20 09 37 FIGURE 6 3 VELGRID ASSEMBLY...
Page 50: ...ADM 880C 07 20 09 45 FIGURE 10 1 FRAME STORAGE FIGURE 10 2 FLOWHOOD IN CASE...
Page 51: ...ADM 880C 07 20 09 46 FIGURE 10 3 FLOWHOOD ASSEMBLY...
Page 53: ...ADM 880C 07 20 09 48 FIGURE 10 7 1X5 FRAME ASSEMBLY FIGURE 10 8 3X3 FRAME ASSEMBLY...
