| Product code number | Switch action | Range °F (°C) | Differential °F (°C) | Bulb and capillary |
Bulb well Order separately |
Range adjuster |
|---|---|---|---|---|---|---|
| Coiled bulb, with fixed differential | ||||||
| A28AA-4C | Two SPDT switches | 30 to
110 (-1 to 43) |
3-1/2
(1.9) each stage 3 (1.7) fixed between stages |
1-3/8 in. x 2-1/4 in. coiled | – | Convertible |
| Wide range, with adjustable inter-stage differential | ||||||
| A28AA-28C | Two SPDT switches | 30 to
110 (-1 to 43) |
3-1/2
(1.9) each stage 2 to 7 adjustable between stages |
12 ft
averaging bulb 6 ft capillary |
– | Screwdriver slot |
| A28AA-29C | Two SPDT switches | -30 to
100 (-34 to 38) |
5 (2.8)
each stage 2 to 7 adjustable between stages |
3/8 in. x 4 in. 8 ft capillary Note: For direct immersion, order packing nut
assembly FTG13A-600R, at extra cost.
|
WEL14A-602R | Convertible |
| A28AA-36C | Two SPDT switches | 40 to 90
(4 to 32) |
3 each
stage 2 to 7 adjustable between stages |
3/8 in.
x 5-3/4 in. 6 ft capillary |
– | Knob |
| A28AA-37C | Two SPDT switches | 60 to
140 (16 to 60) |
5 each
stage 2 to 7 adjustable between stages |
3/8 in.
x 4 in. 6 ft capillary |
WEL14A-602R | Knob |
| A28AJ-4C | Two SPDT switches | 20 to 80
(-7 to 27) |
2 each
stage 2 to 7 adjustable between stages |
3/16 in.
x 22 in. 6 ft capillary |
– | Knob |
| Changeover control | ||||||
| A28AB-1C |
Two SPDT switches The switches are within 1°F (0.6°C) of each other. |
20 to 80
(-7 to 27) |
3-1/2 (1.9) |
3/8 in.
x 5 in. 6 ft capillary |
WEL14A-603R | Screwdriver slot |
| Product code number | Description |
|---|---|
| CVR28A-617R | Concealed adjustment |
| CVR28A-618R | Visible scale |
| KNB20A-602R | Knob kit |