1640 Liquid Level Actuator

Trigger your sampler based on liquid level in the stream or reservoir

1640 Liquid Level ActuatorThe 1640 Liquid Level Actuator provides a simple, reliable way to trigger a Teledyne ISCO sampler to begin a sampling routine when the liquid level reaches a predetermined height. The 1640 comprises a conductivity probe that mounts above the stream, a control box that mounts on the sampler, and connecting cable. It can be used in conjunction with other devices such as a rain gauge or flow meter to trigger sampling on multiple conditions. 

With the control switch set to LATCH, the 1640 will actuate the sampler when the liquid rises to the probe assembly, and the sampler remains actuated when the liquid level recedes. In TOGGLE/RESET mode, the 1640 actuates the sampler only while​​ the liquid is touching the probe, and sampling is suspended if the liquid level recedes.


1640 Liquid Level Actuator User ManualUser Manual


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.


​​​​​​​​​​​​​​​​​​​​​​​​​​​​1640 Liquid Level Actuator

Dimensions (Control Box) HxWxD: 2.92 x 1.38 x 2.25 inches (7.4 x 3.5 x 5.7cm)
Weight: 1.0 lb. (450 gm)
Compatible Teledyne ISCO Samplers: All Teledyne ISCO samplers
Output to Sampler: Open Collector
Cable: Coaxial, 22 ft (7 m) standard; optional with built-to-order cable length up to 250 ft (75 m)
Power Required: 12 VDC (Supplied by sampler)

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


User Manual


Standard Features

  • Works with all Teledyne ISCO samplers
  • Stainless steel conductivity probe resists corrosion and fouling
  • Control box is sealed watertight


  • Triggering sample collection when liquid to be sampled rises to a predetermined level at the sampling point

Options and Accessories

  • 1640 with standard 22 ft (7 m) cable
  • 1640 with optional built-to-order cable length up to 250 ft (75 m)