Air Purge Guide for ProScatterTM Sensors - pcme.com · Purge air needs to be supplied to the sensor...

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Purge air needs to be supplied to the sensor AT ALL TIMES during installation and use in the stack. If good quality, clean, oil-free instrument air is available, then this should be used to provide purge air to the sensor. If this is not available on site, then a PCME supplied Blower Unit should be used instead. Instrument Air: It is recommended to use the Air Filter Regulator Assembly with Automatic Flow Control (ACCAIR-FFRCA) supplied by PCME to provide a constant flow of filtered instrument air to the sensor. This unit takes into account any variation in stack pressure and compensates the purge flow accordingly. Figure 1: Front and side views of the Air Filter Regulator Assembly with Automatic Flow Control (ACCAIR-FFRCA) Air Purge Guide for ProScatter TM Sensors AIR IN (1/4” BSP) AIR OUT (dia. 10mm) Secondary filter for particulate >0.01 mm and oil Regulator to control delivery pressure Flow meter with control Outlet air pressure gauge Key Requirements Ensure air is filtered for water, oil and particulate The flow needs to be automatically controlled to maintain constant output flow. This is achieved using the Automatic Flow Control of the Air Filter Regulator Assembly (see figure 1) Where appropriate, provide air heating so purge air >0°C Filtration Requirements Filter for primary filtration (5 μm) Filter for secondary particle filtration (0.01 μm) + oil vapour removal (max. 0.1 mg/m 3 (ANR), before saturated with oil: 0.01 mg/m 3 (ANR) or less, approx. 0.008 ppm) Flow measurement and control. Flow normally set to 50 Litres/min (maintained constant using Automatic Flow Control). Wall mounting bracket to mount Filter/Regulator. Two M5 clearance mounting holes with centers separated by 90mm Pre-Filter, nominal filter rating for particulate >5 mm Operation Set the delivery pressure regulator to supply sufficient pressure for the flow controller to operate (a sensible level is 1 barg = 15 psig) Set the output flow control to the recommended flow rate (50 Litres/min) Connect the output from the Filter/Regulator to the Air Purge Connector on the sensor enclosure using 10x8 (OD = 10mm, ID = 8mm) tubing (not supplied, max length 5m) Output flow control Wall mounting bracket Pressure transducer Issue 04/12_1

Transcript of Air Purge Guide for ProScatterTM Sensors - pcme.com · Purge air needs to be supplied to the sensor...

Purge air needs to be supplied to the sensor AT ALL TIMES during installation and use in the stack. If good quality, clean, oil-free instrument air is available, then this should be used to provide purge air to the sensor. If this is not available on site, then a PCME supplied Blower Unit should be used instead.

Instrument Air:

It is recommended to use the Air Filter Regulator Assembly with Automatic Flow Control (ACCAIR-FFRCA) supplied by PCME to provide a constant flow of filtered instrument air to the sensor. This unit takes into account any variation in stack pressure and compensates the purge flow accordingly.

Figure 1: Front and side views of the Air Filter Regulator Assembly with Automatic Flow Control (ACCAIR-FFRCA)

Air Purge Guide for ProScatterTM Sensors

AIR IN (1/4” BSP)

AIR OUT (dia. 10mm)

Secondary filter for particulate >0.01 mm and oil

Regulator to control delivery pressure

Flow meter with control

Outlet air pressure gauge

Key Requirements

• Ensure air is filtered for water, oil and particulate• The flow needs to be automatically controlled to

maintain constant output flow. This is achieved using the Automatic Flow Control of the Air Filter Regulator Assembly (see figure 1)

• Where appropriate, provide air heating so purge air >0°C

Filtration Requirements

• Filter for primary filtration (5 μm)• Filter for secondary particle filtration (0.01 μm)

+ oil vapour removal (max. 0.1 mg/m3 (ANR), before saturated with oil: 0.01 mg/m3 (ANR) or less, approx. 0.008 ppm)

• Flow measurement and control. Flow normally set to 50 Litres/min (maintained constant using Automatic Flow Control).

• Wall mounting bracket to mount Filter/Regulator. Two M5 clearance mounting holes with centers separated by 90mm

Pre-Filter, nominal filter rating for particulate >5 mm

Operation

• Set the delivery pressure regulator to supply sufficient pressure for the flow controller to operate (a sensible level is 1 barg = 15 psig)

• Set the output flow control to the recommended flow rate (50 Litres/min)• Connect the output from the Filter/Regulator to the Air Purge Connector on the sensor enclosure using

10x8 (OD = 10mm, ID = 8mm) tubing (not supplied, max length 5m)

Output flow control

Wall mounting bracket

Pressure transducer

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Blower Unit:This section describes the installation of the optional PCME Small Blower Unit for use with PCME ProScatterTM sensors. This may be used as an alternative to the use of instrument air. The blower is designed to supply sufficient purge air (50 Litres/min) under normal stack conditions (Typically -10 to +10 mbarg).

1. Flexible blower Hose (max length 2m, supplied)2. Tube fitting to sensor (60 mm length of connecting tube

supplied 10x8 (OD = 10mm, ID = 8mm)3. Gland for mains power cable (M16)4. Mains power connector (110-230 VAC 50/60 Hz, 2.5A)5. Filter (SPABLW-5-FLT) - replaceable every 6 months

(min)6. Filter bracket

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Install the Blower Unit as follows:

A 2m length of Flexible Blower Hose is supplied with the correct connections to attach to the sensor. Ensure the distance from the Blower Unit to the sensor is less than 2m to allow connection using the supplied Flexible Blower Hose. You need to be able to remove the sensor easily from the stack without removing the Flexible Blower Hose from the sensor. Also, it should be possible to place the sensor on the ground without disconnecting the Blower Unit.

The Blower Unit is designed to be wall mounted with the air and power connections pointing downwards. Feet are supplied to aid mounting.

The blower unit requires its own mains power supply (110-230 VAC 50/60 Hz, 2.5A).

Mounting dimensions:

The Blower Unit should be mounted in the orientation shown above. Feet located at each corner of the Blower Unit to mount to the wall are supplied.

Box dimensions 300mm (W) x 300mm (H) x 180mm (D)Mounting holes* 316mm (W) x 268mm (H)(with feet extended horizontally)Mounting holes* 268mm (W) x 316mm (H)(with feet extended vertically)

*M6 clearance for mounting holes

Figure 2: Wall-mounted Blower Unit

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W

H

side view with lid on

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PCME LtdClearview Building

60 Edison RoadSt Ives Cambs UK

PE27 3GH

Tel: +44 (0)1480 468200Fax: +44 (0)1480 463400

E-mail: [email protected]

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