Boiler house Level controls
2
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 ½ " 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.
Probe length in mm
Maximum expansion in mm (inc. 'dead' length)
470
13
550
15
600
16
650
17
2.3 23
750
20
800
21
900
23
950
25
1 050
27
1 200
30
1 350
34
1 500
38
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 LP21 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 PA420 preamplifier. How to order Example: 1 off Spirax Sarco LP21 capacitance level probe with BSP connection. Probe length 470 mm.
TI-P693-15 EMM Issue 1
Page 3 of 3
LP21 Capacitance Level Probe
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