Water and Wastewater


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Teledyne Isco 3700ZR Refrigerated Sampler for Hazardous Locations DatasheetDatasheet
Isco Stormwater Monitoring GuideOther
Sampler Selection Guide (2014)Other
Sampler Source Book (2014)Other
TDY Environmental Product Guide (2017)Other
3700ZR Sampler User ManualUser Manual


3700ZR Class 1, Div 1 Refrigerated Sampler

Height: 48.5 in (123 cm)
Width: 36 in (99 cm)
Depth: 30 in (76 cm)
Weight: 236 lb (107 kg)
Exterior Materials: Stainless steel, epoxy-coated
Power: 120 VAC 60 HZ, on a dedicated circuit installed by certified electrician
Electrical Safety Rating: Class 1, Div. 1, Groups C&D. UL Certified
Programming: 24-position key pad, 2x20 character LCD


Maximum Lift: 26 ft (7.9 m)
Tubing Life: 500,000 counts (typical)

Purge System

Controller: Monitors air pressure and removes power if a pressure drop is detected
Purge Time: Safe operating pressure reached in 5 minutes after servicing sampler
Plant Air Supply: Requires clean compressed plant air to remove hazardous gases before system start-up and maintains safe pressure inside enclosure. NOTE: the 3700ZR is not intended for use with bottled gas.
Air Supply Pressure: 80 - 120 psig
Air Supply Flow Rate: Source must be capable of supplying 15 SCFM at a minimum of 80 psig during initial 5 minute purge.

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



​3700ZR Class I, Div 1 Refrigerated Sampler

Designed for Safety – UL Approved

The Teledyne ISCO 3700ZR is the only refrigerated sampler that is UL-approved for locations where atmospheres have been designated Class I, Division 1 (or comparable). The design is based on Teledyne ISCO's field-proven 3700 controller and stainless steel clad refrigerator. Most programming and control features offered on standard ISCO 3700 models are available on the 3700ZR, as are sample container configurations using 1 or 2 bottles (glass or plastic).

The 3700 controller is mounted inside a purge enclosure. Special keypad actuators allow the user to program the sampler without compromising safety. A purge controller monitors and maintains an internal pressure greater than that of the surrounding atmosphere, preventing external gasses from entering the purge enclosure. If internal pressure should drop, power input is immediately cut off to prevent possible danger. Power is automatically resumed once normal operating conditions are restored.

The LD90 Liquid Presence Detector and pump revolution counter make sample collection accurate and repeatable.

Standard Features

  • UL-Approved for Class 1, Division 1 (gas groups C & D) locations
  • Rust-resistant stainless steel exterior
  • 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
    • Multiple bottle compositing
    • Split sampling


Stationary sampling in industrial and municipal applications where Class 1, Division 1 safety rating is required

Options and Accessories

  • Multi-bottle sampling configurations - 2 x 2.5 gallon round polyethylene bottles; 2 x 2.5 gallon round glass bottle
  • Single-bottle sampling configurations - 1 x 2.5 gallon round polyethylene bottle; 1 x 2.5 gallon round glass bottle
  • Suction lines and strainers
  • Optional alarm output
  • Optional 4-20 mA interface for flow-paced operation