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​​3700 Full-Size Portable Sampler

Full-size performance and flexibility

The full-featured 3700 Sampler collects sequential or composite samples based on time, flow rate, or storm conditions. It's a great choice if you don't need the sophisticated parameter monitoring and logging capabilities of our 6700 Series.

The exclusive LD90 gives you automatic compensation for changes in head height, plus automatic suction line rinsing to prevent cross contamination. The non-contacting liquid sensor is not affected by conductivity, viscosity, temperature, or liquid composition. There are no internal tubing connections, so cleaning and tubing replacement are fast and easy. The 3700 pump outperforms most competing samplers and maintains the EPA-recommended 2 ft/second line velocity at head heights up to 16 feet, with 1/4-inch suction line. For higher lifts, we recommend our 6700 Series.

Ample ice capacity and high-performance insulation in the base keep your samples cool. With 20 lbs of ice in the base and 4 gallons liquid collected at 65°F, the sample temperature is maintained at least 32°F below ambient for 24 hours.

Standard Features

  • Exclusive LD90 Liquid Presence Detector and pump revolution counting system ensure accurate, repeatable sample volumes.
  • Basic and extended programming modes for:
    • Uniform time intervals
    • Non-uniform time intervals
    • Stormwater runoff sampling
    • Multiple bottle compositing
    • Split sampling
  • Thick, foamed-in-place insulation and twin-wall design provide maximum performance in sample preservation.
  • 3700 Controller is housed in a NEMA 4X and 6 (IP67) environmentally sealed enclosure, and is fully interchangeable between portable and refrigerated samplers.


  • Wastewater effluent
  • Stormwater monitoring
  • CSO monitoring
  • Permit compliance
  • Pretreatment compliance

Options and Accessories

  • Sequential sampling bottle configurations - 24 x 1 liter polypropylene or 350 ml glass.
  • Composite sampling bottle configurations (with optional composite base) - 1 x 2.5 gal polyethylene or glass; 1 x 4 gallon polyethylene.
  • ProPak disposable sample bags
  • Suction lines and strainers
Size (Diam x Ht):19 x 25 inches (50.5 x 64 cm)
Weight:Dry, less battery - 37 lbs (16.8 kg)
​Material:ABS Plastic/td>
​Power Requirements​​12 VDC
​Intake Purge​Adjustable air purge before and after each sample
​Tubing Life IndicatorProvides a warning to change pump tubing
Pump Tubing Life​Typically 1,000,000 pump counts
Intake Suction Tubing​Vinyl or Teflon®; 3/8 inch (1 cm) or 1/4 inch (0.6cm) ID; 3 to 99
feet (1 to 30 m) Length
Maximum Lift26 ft. (7.9 m)
Repeatability​±10 ml typical
Typical Line Velocity at Head Height2.5 ft./s @ 3 ft; 2.5 ft./s @ 10 ft; 1.9 ft./s @ 15 ft. (0.76 m/s @ 0.9 m;
0.76 m/s @ 3.1 m; 0.58 m/s @ 4.6 m)
Liquid Presence DetectorNon-wetted, non-conductive sensor detects when liquid sample
reaches the pump to automatically compensate for changes in
head heights
​Weight11 lbs (5 kg)
Size (HxWxD):10 x 12.5 x 10 inches (25 x 32 x 25 cm)
Operational temperature:​32° to 120°F (0° to 49°C)
Enclosure rating:​NEMA 4X, 6 IP67
​Program Memory​​Non-volatile ROM
​Flow Meter Signal Input5 to 15 VDC pulse or 25 ms isolated contact closure
Interface port:​8 pin connector; data output at 2400 baud in ASCII. RS-232 format
with handshake.
​​Clock Accuracy1 minute per month, typical, for real time clock
​Sample Frequency1 minute to 99 hours 59 minutes (1 minute increments);
non-uniform times in minutes or clock times 1 to 9,999 flow pulses
​Sampling Modes​Uniform time, non-uniform time, event, flow (flow mode is
controlled by external flow meter pulses)
Sample pacing:Uniform time, non-uniform time, flow, flow paced/time switched,
STORM (time and flow paced sampling during sample collection.)
Flow pacing is controlled by external flow pulses.
Multiplexing:Samples per bottle (1 to 50 with 1000 ml bottles; 1 to 17 with 350
ml bottles), bottles per sample (1 to 24), multiple bottle
Sample volumes:Programmable from 10 to 9,990 ml in 1 ml increments
Sample retries:If no sample is detected, up to 3 attempts; user selectable
​Rinse Cycles​Automatic rinsing of suction line up to 3 rinses for each sample
​Program Storage3 sampling programs
​Programming modes:Basic, extended and STORM
​Sampling Stop/Resume​​Up to 24 real time/date sample Stop/Resume commands
​Controller diagnostics:Tests for RAM, ROM, pump display, and distributor