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The BUCK Libra Plus™ personal air sampler consists of a pump contained in a high impact steel fiber filled Lexan, antistatic, and RFI/EMI-shielded case, exclusive electronic circuit board for constant flow control (patent pending), an LCD display with 2 lines of 16 characters, a single diaphragm pump mechanism, and a rechargeable NiMH battery pack.

The purpose of this pump is to draw air contaminants in through a sampling media such as long-duration color detector tubes and absorbent sample tubes; to gauge personal exposure to gases, vapors, particulates, aerosols, etc.

No tools are required to operate this pump and a password protected keypad locking system provides uninterrupted operation. The main display allows quick selection to RUN (for sampling) or MENU (to reset pumps data).

Other features include elapsed time, flow rate, and accumulated volume. The built in timer counts down the sampling time up to 40 hours and automatically turns the pump off with all data is saved.


• Libra Plus™ LP-1 Pump
      • Accuracy: ± 5% of compensation range
      • Flows up to 0.6 LPM
• Libra Plus™ LP-5 Pump
      • Runs 20 + hours @ 2.0 LPM (37 mm 0.8µ filter)
      • Constant flow, high back pressure capability for 25mm 0.45µ asbestos filters
      • Accuracy: ± 5% of compensation range
      • Flows up to 5 LPM for special cyclone requirements
• Libra Plus™ LP-12 Pump
      • Flows up to 12 LPM
      • Accuracy ± 5% of compensation range.
      • High backpressure compensation up to 40” of water 4 LPM
• Libra Plus™ LP-20 Pump
      • Flows up to 15 LPM for Air-O-Cell Cassette sampling
      • Accuracy ± 5% of display reading or pump Flow Faults 
• Displays: elapsed time, accumulated volume and flow rate
• Compact, rugged and quiet
• No tools required to change flow rates
• Flow setting is saved in memory for next day quick start
• Battery pack rechargeable while attached or separately 
• Stainless steel belt clip with built-in tripod connector
• One-hour rechargeable batteries and extended run triple packs
• High impact steel fiber filled Lexan case, antistatic and RFI shielded
• “Auto-restart” within one minute of a flow fault
• Built in washable stainless steel 100 micron filter for economy of use
• One year warranty


AP Buck Pump Feature Comparison


Libra Plus



Allin Plus

Constant Flow
Compensates for changes in backpressure
caused by filter loading and battery voltage
LCD Display
2 Line LCD shows the elapsed time,
accumulated volume and flow rate
Configure pump start/stop times and
sample duration.
Key sampling data is logged and stored for download
Optional PC Link Software
Allows easy pump programming and downloading of data.
Intrinsically Safe Rated
UL Rated in the US and Canada for Class I, II, III 
Div 1 Groups A-G, T3 hazardous locations
  X X
Advanced Constant Flow Control
Additionally compensates for changes in temperature and barometric pressure when regulating the flow rate.


Buck Libra Plus LP-1 Pump with 230v charger

$350.00 Regular Price
$105.00Sale Price
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