WS Series Auto Samplers

Combined composite/discrete samplers for a range of sampling requirements


  • 15’ of sampling hose
  • intake strainer for each pump
  • Sampler Float Switch
  • 1 gallon polybottle for each pump (WS750, WS755)
  • 2.5 gallon polybottle for each pump (WS700, WS705)
  • Rechargeable battery
  • Rechargeable charger

YSI’s WS700 single bottle and WS750 Dual bottle samplers combine all the features you need to meet a wide variety of sampling requirements, including those for Storm water, rivers and streams, industrial discharge, water and waste water treatment and waste water collection.

If your samples need to be refrigerated the WS700R model is ideal for providing the same sampling functions and needs, but with the added benefit of keeping your sample refrigerated.

The WS705 and WS755 models provide the exact same functionality, but come with enhanced portability accessories, such as more ergonomic handles and durable wheels.

  • Sample Size
    The user can adjust the wastewater/stormwater sampler’s peristaltic pumps individually to one of 15 composite sample sizes from 50ml to 2 liters plus a full bottle discrete setting. The wastewater/stormwater sampler’s peristaltic pumps can be set to a single sample time interval from 5 minutes to 12 hours plus an external trigger mode setting for flow proportional sampling
  • Collection Control
    Trigger inputs to control sample collection. The sample bottles are each equipped with a float switch that automatically turns off the peristaltic sampling pump if the water bottle becomes full.
  • Two-in-One
    Does composite or discrete sampling or both at the same time (WS750 & WS755).
  • Automatic Backflush
    Automatic backflush clears pickup strainer and hose.
  • Low Power
    The composite/discrete water sampler’s 5 AH rechargeable battery will power the sampler for several months or a half hour of continous sampling with both pumps. The unit can also be plugged into an external battery source.

Range of features and options

The WS series of samplers has the functionality to add additional data logger options, sensors, and pumps for more ease of use for example:

  • Water Sampler Data Logger option to use the GL-500
  • WSSWK Storm Water Kit
  • Sampler Rain Sensor
  • Sampler Flow Sensor
  • BC100 Smart Battery Charger
  • Quick Release Pump Head
Sampler Selection Chart
   WS700    WS705    WS750    WS755    WS700R
Time or Flow Weighted Sampling
Rugged Enclosure
Outputs for Data Loggers and Sensors
1 Pump
2 Pump
Composite OR Discrete Sampling
Composite AND Discrete Sampling
Enhanced Portability


WS Series Specifications
Operating Temperature 0° to +70°C
Materials Enclosure: Expanded UV protected PVC
Bottle: 2.5 gallon Polyethylene (WS700, WS705 & WS700R), two 1-gallon Polyethylene (WS750 & WS755).
Pickup Hose: 15′ reinforced PVC 1/4″ ID polyethylene flexible tubing section with intake strainer.
Pump Tubing: Norprene 1/4″ ID, 7/16″ OD
Sample Pump Flow Rate: 1000 ml per minute at a 4 foot head
Type: Perisaltic
Maximum Lift: ~20 feet
Battery Rechargeable 5 AH Gel Cell
Battery Life WS700 & WS705: ~1 hour continuous pumping under load
WS750 & WS755: ~1/2 hour continuous pumping under load
Standby: 3 months while still  retaining enough power to run the pump to capacity is required.
Start Delay 16 time settings from 0 to 12 hours
Composite Interval 15 time settings from 5 min. to 12 hours plus an external trigger mode setting.
Sample Size 15 composite sample sizes from 50 ml to 2 liters plus a full bottle discrete setting (approximate sizes at 4 foot head)
External Trigger Input(s) 250 mS minimum pulse width switch closure or 4 to 24 VDC
Pulse Output(s) 5 VDC one-second pulse, 1000 ohm output impedance
Bottle Switch Input(s) Switch closure input, float switch in bottle
Rain and Water Sensors Optional moisture sensors or switch closure inputs
Internal Fuse 10A Slow-Blow
Certificates CE Compliance
Dimensions WS700, WS705, WS750, WS755: 22″H x 17″W x 9″D (56 x 43 x 23 cm)
Weight WS700 & WS705: 20 lbs/9 kg (shipping weight 22 lbs/10 kg)
WS750 & WS755: 22 lbs/10 kg (shipping weight 24 lbs/11 kg)


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