|Thermowells are not usually necessary
with Burling Controls. Their heat sensing tubes are rigid and need no protection unless
there is excessive pressure or a high flow rate. They are usually made of stainless steel
to resist normal conditions. Where conditions are severe or in continuous process
a thermowell may be required.
The specification table for each instrument model shows which
standard thermowell should be
|used for each code number. These are
shown below. It is essential that the full immersion length, "U", be exposed to
If a special well is required, order
by type, material, immersion length, "U", and lagging extension, "T",
if needed. Not available for type 518B.
In all cases, the bushing or union should be located on instrument tube so "C"
or "D" equals well dimension, "U", plus lagging exten
|sion, "T" (if any), plus
either 3/4" (well type A-807) or 1" (well types
A-709, 518-B and A-698-1).
Well type A-666-3 is for use on
certain code numbers for Models
B-1C, B-2C, B-1X and B-2X only.
No bushing or union is used.
Well type A-970-3 can be used for high temperature service on heavy duty models with
.84" OD inconel tubes. A mounting set, part 1236, must be used.