The Gastec GSP-501FT Automatic Air Sampling Pump is a compact, lightweight sampling pump designed for use with compatible Gastec detector tubes and sorbent tubes. It provides controlled air sampling for detector tubes that require a specific continuous flow rate, sampling time, or total sample volume rather than a standard manual pump.

Designed for accurate and convenient field sampling, the GSP-501FT features automatic flow regulation, programmable sampling settings, timer and volume sampling modes, and a digital display that simultaneously shows flow rate, sampling time, and integrated sample volume.

Key Features

  • Automatic air sampling for compatible Gastec detector tubes and sorbent tubes

  • 50–500 mL/min flow range in Timer Mode

  • 10–500 mL/min flow range in Volume Mode

  • Constant flow function automatically compensates for changes in sampling load

  • Simultaneously displays flow rate, sampling time, and integrated volume

  • Timer Mode automatically stops sampling after the programmed time

  • Volume Mode automatically stops after the programmed sample volume is reached

  • Automatic start function allows sampling to begin after a preset delay

  • Stores up to 5 sampling programs

  • Automatic correction of real-time and integrated flow volume to 20°C (68°F) or 25°C (77°F)

  • Quiet operation

  • Compact, portable design

Product Specifications

Brand: Gastec
Product: Automatic Air Sampling Pump
Model / Part Number: GSP-501FT
Timer Mode Flow Range: 50–500 mL/min
Volume Mode Flow Range: 10–500 mL/min
Timer Setting Range: 1 Minute–30 Hours
Integrated Volume Setting: 0.010–900 L
Display: Backlit LCD Digital Display
Display Range: 0–600 mL/min
Instantaneous Flow Accuracy: ±5% at 50–500 mL/min
Operating Temperature: 0–40°C
Operating Humidity: 10–90% RH, Non-Condensing
Power Supply: 2 AA Batteries
Approximate Dimensions: 80 W × 40 D × 126 H mm
Approximate Weight: 280 g Including Batteries
Pump Type: Diaphragm Air Pump

Timer & Volume Sampling Modes

The GSP-501FT provides two primary sampling modes for different gas and vapor measurement applications.

Timer Mode allows the user to select a flow rate from 50 to 500 mL/min and a sampling time from 1 minute to 30 hours. The pump automatically stops once the selected sampling time has elapsed.

Volume Mode allows flow settings from 10 to 500 mL/min and an integrated sample volume from 0.010 to 900 liters. The pump automatically stops once the programmed volume has been collected.

When Volume Mode is set between 10 and 49 mL/min, the GSP-501FT uses intermittent operation at an instantaneous flow rate of 50 mL/min to achieve the selected average sampling rate.

Constant Flow Control

The Gastec GSP-501FT incorporates a constant flow rate function that automatically regulates the pump as sampling resistance changes.

This is especially important when using detector tubes that require a defined sampling rate and volume. Maintaining the correct flow conditions helps ensure the detector tube is used according to its specified measurement procedure.

Compatible Gastec Detector Tubes

The GSP-501FT is designed for use with a wide selection of Gastec automatic air sampling pump detector tubes, including tubes for:

  • Acetone

  • Acrylonitrile

  • Benzene

  • Carbon Disulfide

  • Chlorine

  • Ethylene Oxide

  • Formaldehyde

  • Hexane

  • Hydrogen Cyanide

  • Hydrogen Fluoride

  • Hydrogen Sulfide

  • Isopropyl Alcohol

  • Methanol

  • Methyl Ethyl Ketone

  • Nitrogen Dioxide

  • Tetrachloroethylene

  • Toluene

  • Trichloroethylene

  • Vinyl Chloride

  • Xylene

  • Additional compatible Gastec P and TP Series detector tubes

Always verify the individual detector tube's instructions for the required flow rate, sampling time, sample volume, and correction factor before testing.

Required for Applicable Gastec P & TP Detector Tubes

IMPORTANT: Certain Gastec detector tubes are specifically designed for an automatic air sampling pump and should not be used with a standard manual detector tube pump.

The GSP-501FT provides the controlled flow rates and sampling conditions required by these tubes. For example, Gastec 4TP Hydrogen Sulfide and 12TP Hydrogen Cyanide detector tubes require controlled automatic sampling at specified flow rates and sampling durations.

Always confirm pump compatibility with the specific Gastec detector tube being used.

Standard Accessories

The Gastec GSP-501FT includes:

  • 2 AA Alkaline Batteries

  • Detector Tube Adapter

  • Tube Tip Holder

  • Dust Filters – 5 Pieces

  • Instruction Manual

Optional Accessories

Optional accessories available for the GSP-501FT include a tripod stand, belt loop pump holder, sampling tube holder, detector tube protective cover, reusable rubber safety caps, and tripod mounting plate.

These accessories can help configure the pump for stationary sampling, personal exposure measurement, and other specialized sampling applications.

Common Applications

The Gastec GSP-501FT Automatic Air Sampling Pump can be used for a wide variety of gas and vapor sampling applications, including:

  • Industrial Hygiene & Occupational Exposure Monitoring

  • Workplace Air Quality Testing

  • Personal Exposure Measurement

  • Environmental Air Sampling

  • Indoor Air Quality Testing

  • Chemical & Petrochemical Facilities

  • Manufacturing & Processing Environments

  • Laboratory & Research Sampling

  • Low-Level Gas & Vapor Detection

  • Hazardous Air Pollutant Sampling

  • Detector Tube Measurements Requiring Controlled Flow Rates

  • Sorbent Tube Air Sampling

How It Works

For compatible Gastec detector tubes, break both ends of the detector tube using the appropriate tube tip holder and insert the tube into the pump's rubber tube holder.

Turn the GSP-501FT on, set the required flow rate and sampling parameters according to the individual detector tube instructions, and start the pump.

Once sampling is complete, remove the detector tube and read the concentration according to the instructions for that specific tube.

Important

The GSP-501FT does not use one universal sampling setting for every detector tube. Required flow rate, sampling time, sample volume, correction factors, and measurement procedures vary depending on the Gastec detector tube being used.

Always follow the operating instructions supplied with both the GSP-501FT Automatic Air Sampling Pump and the individual Gastec detector tube before performing a measurement.

Choose Instrument Depot for dependable Gastec GSP-501FT Automatic Air Sampling Pumps, Gastec P Series and TP Series detector tubes, automatic detector tube pumps, industrial hygiene air sampling equipment, sorbent tube sampling pumps, workplace air monitoring equipment, and industrial gas detection supplies.