Spirax Sarco DP27T Installation And Maintenance Instructions Manual page 15

3.13 Temperature ranges
The temperature control system is available
in five temperature ranges as follows:-
Range A
Range B
Range C
Range D
Range E
3.14 Sensor bulb
The type DP27T control is fitted with a
plain bulb as in Figure 4, but as an optional
extra this bulb is supplied with an adaptor
shown in Figure 5, consisting of a union
nipple (U), 'O' ring (V) and gland nut (W).
3.15 Use of plain bulb
Where it is desired to use a plain bulb as in
Figure 4 the adaptor can be removed by
unscrewing the gland nut (W) from the
union nipple (Figure 5) and withdrawing
each piece of the assembly separately over
the bulb.
3.16 Use of immersion bulb
Where it is desired, insert the bulb into a
vessel under pressure. Unscrew the gland
nut (W) from the union nipple (U). This will
enable the union nipple to withdraw over the
bulb. The union nipple can now be screwed
into the tapping provided at the temperature
sensing point.
The union nipple is normally threaded ¾"
BSP but may be ¾" NPT if specially
ordered.
Insert the bulb through the union nipple (U)
until the 'O' ring (V) seats in the union nipple
as shown in Figure 5 and screw home the
gland nut (W) to compress the 'O' ring. The
gland nut needs to be little more than
f i n g e r t i g h t . D o n o t o v e r t i g h t e n
otherwise damage to the 'O' ring will
result.
IM-P240-02-EN-ISS1 CTLS
16 °C to 49 °C
38 °C to 71 °C
49 °C to 82 °C
71 °C to 104°C
93 °C to 127 °C
¾" BSP taper
NPT available
Fig. 4
W
V
¾" BSP taper
NPT available
Fig. 6
W
V
U
Fig. 5
Level
of
fluid
Fig. 7
15