Spirax Sarco - Catalogo Agosto 2017

Boiler house

Level controls

Local regulations may restrict the use of this product to below the conditions quoted.

2.3.19

1⁄2" BSP

Ø26

TI-P402-66

AB Issue 5

PA20

Preamplifier

Description

The PA20 preamplifier is used with a Spirax Sarco capacitance

probe to amplify the capacitance measured and convert it to a

voltage output proportional to the liquid level. It is compatible with

all Spirax Sarco voltage input controllers / transmitters.

The preamplifier consists of a tubular austenitic stainless steel

body which screws onto the top of the probe, and has a DIN 43650

connector with Pg 11 cable gland. The PA20 has three sensitivity

settings, selected to suit different probe lengths by wiring

variations. These are fully described in the Installation and

Maintenance Instructions supplied with the unit.

Principal features:

-

Compact, rigididly mounted.

-

Can be removed / replaced without disturbing the probe.

-

No maintenance needed.

-

Suitable for all probe lengths.

Approvals:

The PA20 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.

Caution: The probe is not suitable for outside installation

without additional environmental protection.

Limiting conditions

Maximum ambient temperature

70°C

Maximum cable length

100m

Dimensions (approximate) in mm

39 mm

105 mm

Materials

No Part

1 Body

2 Cable connector

3 Connector gasket

4 'O' ring

Pg 11 cable gland

Withdrawal distance

for cable socket 15 mm

5 mm

Material

Weight

approximately 0.25 kg

including packaging.

Technical data

Supply voltage

Maximum power requirement

Output volts range

Output impedance

Voltage check graph

15-36Vdc

10mA

1-6Vdc

100W

Austenitic stainless steel ASTM A582 303

Polyamide (Glass filled)

Silicone rubber

Nitrile rubber

Voltage output characteristics / probe immersed lengths.

Safety information, installation and maintenance

This document does not contain sufficient information to install

the product safely. See the Installation and Maintenance

Instructions provided with each unit.

Installation note:

The PA20 is screwed into the top of the capacitance probe and

hand tightened. An 'O' ring is supplied to provide a seal. An

'O' ring is also supplied with the probe. Use only one 'O' ring.

Note: Do not install the probe outdoors without additional

weather protection.

Maintenance note:

No special maintenance is required.

Boiler water level controls do, however, require periodic testing

and inspection, which is described in separate literature.

Spare parts

There are no available spare parts for this unit.

How to specify

Preamplifiers shall be Spirax Sarco type PA20 for use with

Spirax Sarco capacitance probes. Preamplifiers shall have

austenitic stainless steel bodies and a screwed connection, with

a DIN 43650 connector and Pg 11 cable gland.

How to order

Example: 1 off Spirax Sarco PA20 preamplifier.

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Probe immersed lengths mm (inches)

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