Serving the industry since 1967
N-CON Systems Co., Inc.
130 Old Edwards Road
Arnoldsville, GA 30619


The Sentry was designed be flexible. It can be used as a portable or fixed location,  wastewater sampler. Composite may be collected simple time or flow proportioned by connecting it to a suitable flow measurement system. or simple composite sample. The addition of  an ice chest or refrigerator to preserve the composite sample, gives you a low cost sampling system. Its no-nonsense design means that you don’t have to be a weight-lifter to carry it, a computer expert to program it, or have an unlimited budget to afford it.

The Sentry composites samples in the sample container of your choice, from one gallon to a 55 gallon barrel. It can also be used to feed a laboratory or pilot plants systems. The  Sentry operates on either line or battery power.

How it Works:

The Sentry placed near the stream or sewer to be sampled.  When installed in a manhole, the sampler is positioned above the high water level.  The sample inlet line is connected to the sampler’s peristaltic (squeeze-tube) pump.  The size of each sample is set with the “SAMPLE ADJUST” knob.  Next, the “SAMPLES PER HOUR” switch is set to collect 1, 2, 4, or 8 samples per hour, or 1 sample every 2 or 3 hours. The FILL CYCLE Switch is set to turn the sampler off after a set period of time. Finally, the “PURGE CYCLE” switch is set to purge before, after, or both before and after sample collection -- a unique power-saving feature.  All switch settings are visible and the system takes the first sample right away so you know it is working before you leave the field. 

Technical Specifications:

Screw-sealed, gasketed fiberglass NEMA 4X, with clear Polycarbonate cover
Dimensions: 12-1/2”high, 10-1/2” Wide, 7-3/4” Deep
Weight: 10 lbs

Type: Solid state control
Easy to use and review controls:
Samples per hour switch: 1, 2, 4, or 8 samples/hour or 1 sample every 2 or 3 hours
Function switch: Test, Reset, or Set positions with purge selection before, after, or both before and after sample collection
Cycle switch: Used to set system to turn off automatically in 3,6,12, 24, 48 or 72 hours.
Reset button on side: Resets cycle time when sample is picked up without opening programmer cover.
Sample volume sample size between 20 and 500 ML
Power switch: AC - OFF - DC
Circuit protection: 3 AMP fuse

Type: Peristaltic
Material: Polycarbonate
Bearings: Low-friction ball bearings
Tubing: Silicone rubber (medical grade)
Flow rate: 1350 ML/minute at 3’ head
Inlet velocity: 1.5’/second at 3’ head
Lift: 20 feet

Domestic: 115 VAC, 60 HZ, 12 VDC
Export: 220 VAC, 50-60 HZ, 12 VDC
Maximum Power: 45 milliamp continuous,
1 ampere intermittent

Operates in conjunction with any flowmeter providing a momentary unpowered switch closure every preset number of gallons. 4-20 MADC converter is required for analog flowmeter output.

User to  supply Sample container of their choice.


20-038   Inlet tubing: ¼’ID., 3/8’OD clear vinyl with stainless steel inlet weight

19-002  one gallon HDPE jar

19-003  2 gallon rectangular polyethylene

19-005 5 gallon polyethylene

15-508  Battery cable for external, user supplied, 12volt battery

15-010  AC/proportional hook-up cable

11-012PK  Pump Tube pack of 4 spares