Boiler house

Level controls

Dimensions (approximate) in millimetres

L - Probe length

370

470

550

600

650

750

M22 x 1.5

800

900

950

1 050 1 200 1 350 1 500

Safety information, installation and maintenance

This document does not contain sufficient information to

install the system safely. See the Installation and Maintenance

Instructions supplied with the probe for full details.

Installation note:

Do not install the probe outdoors without additional weather

protection.

The probe is installed in a 1⁄2" BSP female connection. If the probe

is to be installed in a boiler shell or a turbulent tank, fit a protection

tube. This should be as long as possible, and at least long enough

to cope with expansion of the probe at higher operating

temperatures. The Table below shows the maximum probe

expansion possible 0 - 239°C.

162

Probe length

in mm

370

470

550

600

650

750

800

900

950

1 050

1 200

1 350

1 500

Maximum expansion in mm

(inc. 'dead' length)

10

13

15

16

17

20

21

23

25

27

30

34

38

27 A / F

1⁄2" BSP taper connection

The LP20 is also available

with a 1⁄2" NPT screwed

connection, approved to

UL61010. Please note

that this version will not

be marked and is not

suitable for Europe.

Do not cover the vent and drain holes on the body.

Maintenance note:

No special maintenance is required. Boiler water level controls

and alarms do, however require periodic testing and inspection,

which is described in separate literature.

How to specify

Capacitance level probes shall be Spirax Sarco type LP20 with

stainless steel body, cover assembly and probe, and PTFE probe

insulation. They shall be suitable for modulating and on/off level

control and be fitted with a screwed connection for attaching a Spirax

Sarco PA20 preamplifier.

How to order

Example: 1 off Spirax Sarco LP20 capacitance level probe with

BSP connection. Probe length 470 mm.

(L)

Probe

length

25 mm 'dead' length

Weights (approximate) in kg including immediate packaging

Probe length

370

470

550

600

650

750

Weight

0.82

0.84

0.91

0.98

1.03

1.08

1.17

1.26

1.34

1.42

1.50

1.64

1.68

800

900

950

1 050

1 200

1 350

1 500

TI-P402-39 AB Issue 9

LP20 Capacitance Level Probe

2.3.18