Sensing elements - PENN Controls - LIT-125125 - A28G - Electromechanical Temperature Control - A28 and A36 Multi-Stage Temperature Control

A28G Series Two-Stage Temperature Controls Without Enclosure Product Bulletin

Product name
A28 and A36 Multi-Stage Temperature Control
Document type
Product Bulletin
Document number
Revision date

A 3/8 in. (9.5 mm) diameter bulb and 6 ft (1.8 m) capillary are included as standard.

Optionally, on quantity orders, you can order the following items at extra cost:

  • A capillary longer than 6 ft
  • A bulb with an outside diameter of 3/16 in. (4.8 mm), 1/4 in. (6.4 mm), or 5/16 in.(7.9 mm)
  • A coiled bulb for low movement air applications
  • A 3/16 in. x 22 in. long bulb for detecting the average temperature in air ducts, within the 20°F to 90°F (-7°C to 32°C) range only

The following bulb style is available for clamp-on or closed tank applications.

Figure 1. Style 1 swaged bulb with support tube
Note: The bulb style can be Style 1 or Style 4. To obtain a Style 4 bulb, use a Style 1 bulb with support tube, and add an FTG13A-600R packing nut assembly for 1/2 in. NPT tapping.
Figure 2. Style 4 bulb

The following bulb wells are available for applications where you can remove a temperature bulb without draining the tank.

Figure 3. Bulb well for liquid immersion applications
Table 1. Bulb well assembly dimensions
Part number Dimensions
A, in. (mm) B, in. (mm)
WEL14A-603R 5.81 148 1.81 46
WEL16A-601R 2.81 71