PBSI Group Limited Registered O�ce, Belle Vue Works, Boundary Street, Manchester, M12 5NG Company No. 2030212 Cardi�

P&B Weir Electrical, Unit 1, Lea�eld Way, Lea�eld Ind. Est., Corsham, Wiltshire, SN13 9SW, UKT: 0044 (0)1225 811 449 F: 0044 (0)1225 810 909 E: weir@pbsigroup.com W: www.pbsigroup.com

Method of On-Site Testing of Buchholz

These instructions are for guidance only. All testing should be carried out in accordance with sub-station guidelines and safety procedures.

• Place pump on stable area of ground.

• Open unit and attach �exible pipe to non-return valve outlet using suitable spanner (do not over tighten brass fasteners).

• Ensure that outlet valve is closed (i.e. at right angle to ballvalve body).

• When access clear, connect �exible hose to TEST ball valve upon Buchholz. Open TEST ballvalve.

• Connect suitable test meter to Buchholz terminals in accordance with sub-station requirements (it is recommended that the switch resistances be measured to avoid damaging switches).

• Working back upon the ground, unfasten the foot pump. Pump air into the polycarbonate cylinder until the pressure gauge reads a value of approximately 40 p.s.i.

• Quickly open the ballvalve on the unit and monitor the TRIP switch,which should operate and then return to its 'normal' position.

• The air passed into the Buchholz during the test should be su�cient to operate the ALARM switch.

• Air should be removed from the Buchholz by opening the 'GAS' ballvalve. Close 'GAS' ballvalve.

• It should be noted that where a long length �exible hose is used the pressure might need to be increased due to the loss of pressure this causes during testing. Repeat test as necessary with increasing pressures.

• After satisfactory testing close TEST ballvalve, remove �exible hose and replace dust caps.

• Remove test meter from Buchholz terminals and re�t terminal box cover.

• Fasten foot pump and close ballvalve on unit and re�t dust cap.

• Inspect silica gel and if orange colour faint, regenerate as detailed.

Routine Maintenance

The foot pump pivots and piston (accessible from rear of pump) should be lubricated with light oil.

The �exible connection hose should be checked for cuts or abrasions.

Inspect polycarbonate cylinder for deep scratches. Do not use if damaged.

Check silica gel is coloured orange. If not, disassemble cylinder and remove gel crystals. Gently heat (less than 250C) in a pan until orange colour is restored. Reassemble unit and wash hands and pan with soapy water.

Technical Details

• Maximum recommended operating pressure 60 p.s.i.g.

• Size: 475 x 250 x 128mm.

• Weight: 8kg per unit.

• The unit is self-contained in a rugged steel case with plated fasteners and a carrying handle to ease transportation.

• 7 metre long �exible hose provided with �ttings to suit 1/8" BSP ballvalves. Hose can be transported in case.

• Damaged units should be returned to works for repair/quotation. Spare parts are available ex works.

Dry Air Pump (for testing of Buchholz Relays)

PBSI Group Limited Registered O�ce, Belle Vue Works, Boundary Street, Manchester, M12 5NG Company No. 2030212 Cardi�

P&B Weir Electrical, Unit 1, Lea�eld Way, Lea�eld Ind. Est., Corsham, Wiltshire, SN13 9SW, UKT: 0044 (0)1225 811 449 F: 0044 (0)1225 810 909 E: weir@pbsigroup.com W: www.pbsigroup.com

Method of On-Site Testing of Buchholz

These instructions are for guidance only. All testing should be carried out in accordance with sub-station guidelines and safety procedures.

• Place pump on stable area of ground.

• Open unit and attach �exible pipe to non-return valve outlet using suitable spanner (do not over tighten brass fasteners).

• Ensure that outlet valve is closed (i.e. at right angle to ballvalve body).

• When access clear, connect �exible hose to TEST ball valve upon Buchholz. Open TEST ballvalve.

• Connect suitable test meter to Buchholz terminals in accordance with sub-station requirements (it is recommended that the switch resistances be measured to avoid damaging switches).

• Working back upon the ground, unfasten the foot pump. Pump air into the polycarbonate cylinder until the pressure gauge reads a value of approximately 40 p.s.i.

• Quickly open the ballvalve on the unit and monitor the TRIP switch,which should operate and then return to its 'normal' position.

• The air passed into the Buchholz during the test should be su�cient to operate the ALARM switch.

• Air should be removed from the Buchholz by opening the 'GAS' ballvalve. Close 'GAS' ballvalve.

• It should be noted that where a long length �exible hose is used the pressure might need to be increased due to the loss of pressure this causes during testing. Repeat test as necessary with increasing pressures.

• After satisfactory testing close TEST ballvalve, remove �exible hose and replace dust caps.

• Remove test meter from Buchholz terminals and re�t terminal box cover.

• Fasten foot pump and close ballvalve on unit and re�t dust cap.

• Inspect silica gel and if orange colour faint, regenerate as detailed.

Routine Maintenance

The foot pump pivots and piston (accessible from rear of pump) should be lubricated with light oil.

The �exible connection hose should be checked for cuts or abrasions.

Inspect polycarbonate cylinder for deep scratches. Do not use if damaged.

Check silica gel is coloured orange. If not, disassemble cylinder and remove gel crystals. Gently heat (less than 250C) in a pan until orange colour is restored. Reassemble unit and wash hands and pan with soapy water.

Technical Details

• Maximum recommended operating pressure 60 p.s.i.g.

• Size: 475 x 250 x 128mm.

• Weight: 8kg per unit.

• The unit is self-contained in a rugged steel case with plated fasteners and a carrying handle to ease transportation.

• 7 metre long �exible hose provided with �ttings to suit 1/8" BSP ballvalves. Hose can be transported in case.

• Damaged units should be returned to works for repair/quotation. Spare parts are available ex works.

Dry Air Pump (for testing of Buchholz Relays)