3700C Compact Portable Sampler

Fits where a full-size sampler won't

3700C Compact Portable SamplerSmaller and lighter than our full size 3700 portable, the 3700C uses the same controller. The 3700C will easily pass through an 18-inch diameter or offset manhole. 

Bottle choices with the 3700C are more limited than with the full-size model. The bottle options are: 24 polyethylene 500 ml bottles; a single 2.5 gallon (9.5 liter) polyethylene or glass bottle; or a single 2.0 gallon (7.5 liter) ProPak bag with holder. When using the 24-bottle configuration, the 3700C's bottle carrier makes bottle changes fast and easy. 

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.


When you purchase instruments from Teledyne ISCO, you not only receive innovative, high quality products, you also receive excellent customer service and product support. Your initial purchase is only the beginning of Teledyne ISCO's ongoing commitment to their customers.


Sampler Selection GuideBrochure
Sampler Source BookBrochure
ISCO 3700C Compact Portable Sampler DatasheetDatasheet
Isco Stormwater Monitoring GuideOther
3700 Portable Sampler Pocket Guide (German)Pocket Guide
3700 Portable Sampler Pocket GuidePocket Guide
3700 Portable Sampler User ManualUser Manual


​​​​​​​​​​3700C Compact Portable Sampler

Size (Diam x Ht): 17 x 27 inches (45 x 70.5 cm)
Weight: Dry, less battery - 25 lbs (11.3 kg)
Material: ABS Plastic
Power required: 12 VDC


Intake purge: Adjustable air purge before and after each sample.
Tubing life indicator: Provides a warning to change pump tubing.
Pump tubing life: Recommended 500,000 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 lift: 26 ft. (7.9 m)
Repeatability: ±10 ml typical
Typical line velocity @ Head height: 2.5 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 detector: Non-wetted, non-conductive sensor detects when liquid sample reaches the pump to automatically compensate for changes in head heights.


Weight: 11 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 input: 5 to 15 volt DC pulse or 25 millisecond isolated contact closure.
Interface port: 8 pin connector; data output at 2400 baud in ASCII. RS-232 format with handshake.
Clock accuracy: 1 minute per month, typical, for real time clock


Sample frequency: 1 minute to 99 hours 59 minutes, in 1 minute increments. Non-uniform times in minutes or clock times 1 to 9,999 flow 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 compositing.
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 collection
Program storage: 3 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

​For a full list of product specifications, see the datasheet.



Standard Features

  • Quick-change bottle cartridge system
  • 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 foam insulation (R-11) and 16-lb. ice capacity to preserve samples.
  • 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 configuration - 24 x 500 ml wedge-shaped polyethylene
  • Composite sampling bottle configurations - 1 x 2.5 gal (9450 ml) polyethylene or glass; 1 x 2.0 gal (7500 ml) ProPak® single-use bag
  • Suction lines and strainers