8258 - Eutectic Temperature Sensing Switch

Features

● NO RECALIBRATION REQUIRED (ACCEPTABLE TO MMS)

● FIELD REPLACEABLE SENSOR

● VIBRATION RESISTANT

● NEMA 3 HOUSING

● RUGGED DESIGN

● UNIQUE UNION FOR EASY INSTALLATION

Applications (Temperature)

● BEARINGS

● EXHAUST STACKS

●COMPRESSOR DISCHARGE

● ENGINE EXHAUST

● PACKING GLAND

● EQUIPMENT TEMPERATURE

Operation

Eutectic-type temperature sensors are widely applied and field proven in bearing temperature sensing applica-tions due to their fast response and drift-free perfor-mance. Now they are being used in other temperature sensing applications where regulatory agencies require frequent functional testing and calibration of temperature sensors used in safety control and warning systems for exhaust stacks, engine and compressor discharge. AMOT Eutectic Temperature Switches provide an alter-native to frequent recalibration of other temperature sensing devices. Most companies require only that the Eutectic Fuse Rod Assembly be replaced yearly which dramatically reduces down time and maintenance costs.

AMOT Model 8258 Eutectic Temperature Switches use a fusible eutectic material that can not be recalibrated and even test firing requires replacing the Eutectic Fuse Rod Assembly. The fuse rod assembly can be easily replaced in the field.

PATENTED EUTECTIC ALLOY temperature sensor features permanent calibration, no periodic checking required.

REPLACEABLE TEMPERATURE SENSOR - The eutectic alloy fuse rod assembly can be easily replaced in the field.

VIBRATION RESISTANT - AMOT Model 8258 Temperature sensing Switches are specifically designed for use on vibrating equipment such as heavy duty engines, compressors, pumps and other industrial applications.

RANGE - 7 precision temperature settings from 174° to 343°F (79° - 173°C). For optimum service life, it is recommended that the device be run 20°F (11°C) below its trip temperature.

UNIQUE UNION - A unique union nut connects the switch housing to the temperature sensor allowing the sensor to be installed in tight quarters or the switch to be easily swiveled to align with conduit connections. Once tight-ened, it provides a rigid connection between the switch and the sensor well.

RUGGED SWITCH HOUSING - precision cast aluminum. Full gasket seals provide a raintight unit designed to meet Enclosure 3 requirements of NEMA, UL, and CSA. They are not recommended for installation in an oil-filled crank-case or where oil pressure might cause oil to encroach into the switch housing along the Fuse Rod.

IMMERSION WELLS available for use when sensing fluid or gas temperatures.

AMOT Model 8250 Series fills the need for a reliable switch at a low initial cost. Their long service life reduces mainte-nance costs by eliminating the need for frequent service or replacement.

Although not explosion proof, these switches can be used in hazardous areas if used with an intrinsically safe elec-tronic annunciator.

Specifications

Housing Material......................Precision Cast Aluminum
Internal Parts........................Stainless and Plated Steels
Fuse Rod Assembly................................................Brass

Maximum Working Pressure on Optional Well*
Part No. 9859L(---).....8000 psi (55120 kPa)

Maximum Switch Housing Temperature....250¡F (121¡C)
Vibration.............................Resistant up to 4G at 100 Hz

Switch Ratings**....SPDT....125/250/460 VAC - 15 amp

................125 VDC - 1/2 amp
................250 VDC - 1/4 amp
......................30 VDC - 5 amp
....................15 VDC - 15 amp