Land Ametek RT8A, Руководство по установке

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Page 8
RT8A Thermometer Installation Guide
8 Air Supply Requirements
A relatively cool, dry, clean air supply of 1.75 to 10.5 Kg/cm
2
(25 to 150 lb/in
2
)
pressure is required for use with the System A/A air filter system. Connect the
air supply to the thermometer jacket and set the flow rate to approximately 7
litres/second (15 cu ft per minute).
Fig. 8 Air supply system interconnections
9 Power Supply Requirements
The thermometer works on a 4 to 20mA current loop and gives a 4 to 20mA
linear output over its temperature range (either 0 to 250°C, 0 to 500°C, 0 to
500°F or 0 to 1000°F depending on the thermometer type).
The thermometer requires a power supply of 11 to 35V d.c. which is normally
supplied by the LAND power supply unit or an indicator with loop power option.
The power supply unit and the indicator require an a.c. supply of 110 or 240 volts
(specified at time of ordering).
Air Purge Inlet
Air in
Land System A/A Air Filter System