It must not be used for measuring flammable or combustible gases in mixtures containing oxidants (e.g. atmospheric oxygen) within the explosion range. The PBR 260 is part of the Pfeiffer Vacuum Compact Gauges family and can be operated in connection with the MaxiGauge™ measurement and control unit TPG 256 A or with another evaluation unit.
Contents Product Identification Validity Intended Use Functional Principle Trademarks 1 Safety 1.1 Symbols Used 1.2 Personnel Qualifications 1.3 General Safety Instructions 1.4 Liability and Warranty 2 Technical Data 3 Installation 3.1 Vacuum Connection 3.1.1 Removing and Installing the Electronics Unit 3.1.2 Mounting the Extension 3.2 Power Connection 3.2.1 Use With MaxiGauge™...
Communicate the safety instructions to other users. 1.4 Liability and Warranty Pfeiffer Vacuum assumes no liability and the warranty becomes null and void if the end-user or third parties • disregard the information in this document •...
2 Technical Data Measurement Measurement range (air, N 5×10 … 1000 hPa Overlapping range hot cathode – Pirani –3 –2 high (default) 5.5×10 2.0×10 … –3 –3 2.0×10 8.0×10 … Accuracy ≈15 % reading ... 10 hPa) (after 5 min. stabilization) Repeatability ≈5 % reading ...
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Adjustment Pirani automatic adjustment by hot cathode system at p = 1 … 3×10 ATM (<ATM> button) adjustment via <ATM> button (keep button depressed for at least 5 seconds) at atmospheric pressure Zero point adjustment (<ATM> adjustment via <ATM> button (keep button) button depressed for at least 2 seconds) at ≤1×10...
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Ambiance Admissible temperatures storage -20 °C … 70 °C operation 0 °C … 50 °C bakeout +150 °C (without electronics unit or with extension → 26) Relative humidity year's mean ≤ 65 % (no condensation) during 60 days ≤ 85 % (no condensation) indoors only altitude up to 2000 m NN Degree of protection...
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Flange DN 40 CF-R Dimensions [mm] DN 63 CF-R Weight 550 g BG 5171 BEN / B (2017-02) PBR 260...
3 Installation 3.1 Vacuum Connection DANGER DANGER: overpressure in the vacuum system > 100 kPa If clamps are opened incorrectly or inadvertently, injury can be caused by catapulted parts and your health can get damaged by leaking pro- cess media. Do not open any clamps while the vacuum system is pressurized.
Procedure Remove the protective cap. The protective cap will be needed for maintenance. Make the flange connection. Install the gauge in such a way that it need not be removed for adjustment (→ 17, 19). 3.1.1 Removing and Installing the Electronics Unit Tools / material required •...
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a) Unscrew the hexagon socket screw (1) on the side of the electronics unit (2). Be careful not to lose the hexagon socket screw. b) Remove the electronics unit without twisting it. Mounting a) Place the electronics unit on the sensor (3) (be careful to correctly position the pins and the guide notch (4)).
3.1.2 Mounting the Extension With the optional extension (→ 26) the sensor can also be baked during opera- tion at temperatures up to 150 °C (only at p<10 hPa, since the Pirani sensor furnishes inexact readings at higher temperatures). Caution Caution: rising heat If your gauge is installed vertically, heat can rise even through the...
3.2 Power Connection 3.2.1 Use With MaxiGauge™ If the gauge is used with a MaxiGauge™ measurement and control unit, a corresponding sensor cable is required (→ 26). • Plug the connector into the gauge and secure it with the screw (tightening torque ≤...
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WARNING The supply common (pin 5) and the shield (pin 6) must be connected at the supply unit with protective ground. Incorrect connection, incorrect polarity or inadmissible supply voltages can damage the gauge. Reassemble the connector. At the other end of the cable, mount a connector which is compatible with your evaluation unit.
4 Operation When the voltage is supplied, the measuring signal is available between pins 2 and 3. Over the whole measurement range, the measuring signal is output as a logarithm of the pressure (relationship between measuring signal and pressure → Appendix B). Allow for a stabilizing time of approx.
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Pirani Within certain limits the thermal conductibility of gases is pressure dependent. This physical phenomenon is used for pressure measurement in the thermal conductance vacuum meter according to Pirani. A self adjusting bridge is used as measurement circuit (see Fig. 2). A thin tungsten wire is used as sensor element. Wire resistance and thus temperature are kept constant through a suitable control circuit.
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Defining the switching on/off The PBR 260 has two definable switching on/off ranges with their corresponding range overlapping ranges. The switching on/off range is selected with the <P ↔ BA> switch and should be chosen in such a way that it is situated outside the process pressure range.
Gas type dependence The measuring signal is gas type dependent. The relationship between the measuring signal and the pressure is accurate for N , dry air and CO (→ Appendix B). They can be mathematically converted for other gases (→ Appendix C). If the gauge is being operated with MaxiGauge™...
5 Maintenance 5.1 Maintenance DANGER DANGER: contaminated parts Contaminated parts can be detrimental to your health. Before you begin to work, find out whether any parts are contami- nated. Adhere to the relevant regulations and take the necessary precautions when handling contaminated parts. 5.2 Adjusting the Gauge The gauge is factory calibrated.
Required tools • Pin approx. ø1.3 × 50 mm (e.g. a bent open paper clip) Procedure The push button used for the adjustment at atmospheric pressure is also used for the zero point adjustment (→ above). Operate gauge for approx. 10 minutes at a pressure of ≤1×10 hPa.
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Procedure a) Carefully remove the grid with pointed tweezers. b) Carefully place the baffle onto the sensor opening. c) With a stick carefully press the baffle down in the middle until it catches in the sensor opening. BG 5171 BEN / B (2017-02) PBR 260.oi...
5.5 Replacing the Baffle In case of severe contamination the baffle can be replaced. Caution Caution: dirt sensitive area Dirt prolongs the pumpdown process. Always wear clean, lint-free gloves and use clean tools when working in this area. Tools / material required •...
5.6 Replacing the Sensor Replacement is necessary, when • the sensor is severely contaminated • the sensor is faulty, e.g. filament broken. Gauge failures due to contamination or wear and tear, as well as expendable parts (e.g. filament), are not covered by the warranty. Tools / material required •...
6 Deinstallation DANGER DANGER: contaminated parts Contaminated parts can be detrimental to health. Before beginning to work, find out whether any parts are contami- nated. Adhere to the relevant regulations and take the necessary precautions when handling contaminated parts. Caution Caution: vacuum component Dirt and damages impair the function of the vacuum component.
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Place the protective cap. BG 5171 BEN / B (2017-02) PBR 260.oi...
Form under www.pfeiffer-vacuum.com Products that are not clearly declared as "free of harmful substances" are de- contaminated at the expense of the customer. When returning a product to Pfeiffer Vacuum, put it in a tight and impact resistant package. 8 Options Ordering number Sensor cable for connection to MaxiGauge™...
10 Disposal DANGER DANGER: contaminated parts Contaminated parts can be detrimental to health. Before beginning to work, find out whether any parts are contami- nated. Adhere to the relevant regulations and take the necessary precautions when handling contaminated parts. WARNING WARNING: substances detrimental to the environment Electronic components must be disposed of in accordance with special regulations.
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–2 Above 10 p (hPa) (Pirani range) Indication range above 10 Freon 12 –1 Water vapor –2 –3 –2 –1 4 6 8 4 6 8 4 6 8 4 6 8 (hPa) Caution A mixture of gases and vapors is often involved. In this case, accurate determination is only possible with a partial-pressure measuring in- strument.
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Notes BG 5171 BEN / B (2017-02) PBR 260.oi...
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