MAMAC Systems A-500 Data Sheet

Thermowell

Model A-500

• 4", 6", 8" and 12" lengths

• Brass or stainless steel material

• Machined from a single piece of metal

• Withstands up to 3000 PSIG pressure

• ¾" external with ½" internal or ½"

...external with ¼" internal thread options

• BSPP ½" external with ¼" NPT internal

...thread available

The A-500 thermowell is machined from a single piece of brass or stainless steel
to provide a rugged and leakproof well for MAMAC Systems' temperature sensors.
Each A-500 thermowell is precisely machined to 0.255" bore to provide a tight fit
for our standard ¼" O.D. probe. This feature also significantly enhances the ther­mal transfer from the media to the temperature sensor. The external and internal
threads are machined to meet published specifications exactly, and each well is
individually inspected to insure thread integrity. Hexagon wrench flats are pro­vided to assist in installing the well in the pipe. Other thermowells that incorporate
dissimilar metals like brass and copper which are welded/soldered together are
susceptible to leaks caused by thermal shock. In HVAC applications, the tempera­ture of the media may change rapidly, and due to different coefficient of thermal
expansion, a welded/soldered thermowell may leak. The A-500 thermowell has a
single piece construction and, as a result, is immune to leaks which may be caused
by thermal shock or weak welds. The MAMAC A-500 thermowell is available in 4",
6", 8" and 12" lengths to handle pipe diameters from 4" to 24". With more than
four length options, brass and stainless steel material choices, three external
thread options, solid leakproof one piece construction, and precision machining,
the A-500 thermowell can reliably accommodate all HVAC immersion temperature
sensing applications. In order to improve thermal transfer and to eliminate conden­sation forming within the thermowell, MAMAC Systems offers a high grade thermal
compound (A-505) for the A-500 thermowell.

RoHS

DN500.5

® Registered trademark MAMAC SYSTEMS, Inc.

© Copyright 2013

A-500

A-500-1 (4")

A-500-2 (6")

A-500-3 (8")

A-500-4 (12")

Internal

Thread

0.750"

AU

4¼" (108 mm)

6¼" (159 mm)

8¼" (210 mm)

12¼" (311 mm)

1.000"

External Thread

2½" (64 mm)

4½" (114 mm)

6½" (165 mm)

8½" (216 mm)

A

U

Weight

.45 lbs (.21 kg)

.60 lbs (.27 kg)

.75 lbs (.34 kg)

1.0 lbs (.45 kg)

2.500"

0.500"

0.250"

0.255"

0.625"

ORDERING INFORMATION: A-500-

Length

1 4 inches/100mm
2 6 inches/150mm
3 8 inches/200mm
4 12 inches/300mm

Example: A-500-2-A-1 : 6” Thermowell with ¾" NPT External and ½" NPT Internal thread size, Brass.

Thread Size

A ¾" NPT External
½" NPT Internal

B ½" NPT External
¼" NPT Internal

E ½" BSPP External
¼" NPT Internal

Material

1 Brass
2 Stainless Steel

CAUTION: Do not use in explosive/hazardous environment or with flammable/combustible media.

2

DN500.5

® Registered trademark MAMAC SYSTEMS, Inc.

© Copyright 2013