Automatic Stationary Liquid Samplers

 

Model: CVS-C; Indoor Composite  

Model: CVS-D; Indoor Discrete      

 Model: BVS-C; Outdoor Composite

 Model: BVS-D; Outdoor Discrete    

General Information

Southwell’s Sirco brand stationary samplers incorporate our patented vacuum/compressor

sampling system.  Sample fluid travel is limited to the intake hose, metering chamber and discharge hose, eliminating sources of cross-sample contamination such as pumps, valves and distribution plates.  Repeatable sample volumes are obtained by accurate volumetric measurement of each sample, while rapid transport velocities ensure representative concentrations of solids in the sample fluid.

Interval time and flow proportional sampling are standard with every Southwell sampler.  Sample initiation settings are now menu selectable.  Flow proportional inputs include 4-20mA, multiple pulse and external contact closure as well as sustained level control.

Stationary samplers are manufactured to provide the extended, low maintenance operation required in permanent installations.  Enclosures are fabricated from heavy gauge steel with heat cured polyester based powder paint for added corrosion resistance.  BVS series outdoor models feature a locking door and bolt down instrument panel for security protection.   Optional thermostatically controlled forced air heater and cabinet insulation are offered for operation in cold weather conditions.  The CVS series offers all the capabilities of the BVS samplers in a compact indoor design.

 

Custom Design

In addition to standard production model samplers, Southwell Controls can also provide custom designs for special applications.  Should additional features be required for your monitoring program, please contact us or your nearest representative to discuss your specific requirements.


Sampling Sequence

Sample collection begins with a high pressure air purge of the intake assembly to remove residual liquid and obstructions.  Upon completion of the pre-purge cycle, the system converts to a vacuum state, drawing the sample through the intake hose, into the metering chamber until contact is made with the adjustable level sensor.  The system then pressurizes, ejecting excess fluid back through the intake line until the predetermined sample volume is achieved.  If the sampler, for any reason, is unable to draw a sufficient volume of fluid to obtain a sample, the operator may program the unit to automatically initiate a second attempt.  Should a sample not be delivered after a second attempt, the sampler shall abort the sequence and await the next sample initiation signal.   Upon two consecutive failures the sampler will suspend the sampling program until manually reset and provide a sample fault indication.

 

Sampler Controller

 

 

The multifunction controller is designed for versatility and simplicity.  Housed in an environmentally sealed enclosure for corrosion protection, the microprocessor based controller is programmable via a 16 position keypad.   All information is viewed on a 2 x 16 character LCD backlit display which guides the operator through programming sequences with easily understood directions.  In the event of power failure, all program settings and information stored in the controller are maintained by an internal lithium battery.

 

Volumetric Metering Chamber

                    

Available in both 500cc and 1000cc configurations, our large capacity metering chambers deliver repeatable sample volumes regardless of variations in suspended solids content, sample lift or fluid velocity at the sample source.

Adjustable volume pre-sizing provides complete flexibility in both final sample volume and oversizing of the sample for representative results.  Sample fluid is expelled under pressure to the sample container ensuring collection of all solids.  Wetted materials consisting of glass, stainless steel and fluorocarbon resins are offered for toxic sampling applications.

 

Rapid Sample Transport Velocities

Southwell’s patented system maintains sample transport velocities through a 3/8” ID intake hose in excess of 3 ft/s for sample lifts up to 20 ft.  This important feature allows representative sampling of large particles (unaltered or deformed) and suspended solids over high lifts without the precipitation problems associated with lower transport velocity samplers.  A 5/8” ID intake system is also available for collection of even larger particles and reduced risk of intake line fouling. This larger system maintains transport velocities in excess of 3 ft/s for sample lifts up to 16 ft.


 

Design Specifications for BVS/CVS Series Stationary Liquid Samplers

 

Start Delay

•  Disabled – no start delay

•  Time/Day – adjustable, up to 1 week in advance

•  Pulse Count – adjustable, up to 9999999

•  4-20mA – adjustable, up to 999999

                 (4-20mA = 0 to 100 Pulses/Minute)

•  External Contact – momentary, 25 millisecond dry contact

•  Level Control – adjustable, up to 99 second contact duration

Sample Initiation

•  Disabled – no sample initiation

•  Interval Time – adjustable up to 999 hours, 59 minutes

•  Pulse Count – adjustable up to 9999999

•  4-20mA – adjustable, up to 999999

                (4-20mA = 0 to 100 Pulses/Minute)

•  External Contact – momentary, 25 millisecond dry contact closure

Program Type

•  Composite – terminate after up to 9999999 samples

•  Multi-Composite – adjustable up to 99 cycles per bottle

•  Consecutive – adjustable up to 9 bottles per cycle

•  Daily Cycle – adjustable up to 9 bottles per day

                (total not exceeding actual bottle count)

•  Timed Step – adjustable up to 99 hours, 59 minutes per step

Clock

•  Real Time clock – real time operating system

Pinch Valve

•  Fixed – normally open

Purge Cycle

•  Adjustable – 1 to 99 seconds

Suction cycle

•  Variable – adjusts automatically to double the input value   of

                the purge time setting or until liquid contacts level electrode in

                metering chamber

Alarm Outputs (Independent)

•  Cycle abandoned (DC relay driver, sinking, momentary)

•  Sample fault (DC relay driver, sinking, sustained)

•  Container full (DC relay driver, sinking)

Status Outputs

•  Sample taken (DC relay driver, sinking, momentary

Direct Function Keys

•  Manual sample

•  Manual purge

•  Manual bottle advance

Switches

•  Run/off (SPST toggle)

•  On/off (5 amp lighted breaker)

       (opt)   Refrigerator on/off (5 amp lighted breaker)

       (opt)   Heater on/off (5 amp lighted breaker)

Sample Volume

•  Adjustable,    50cc   to    500cc

       (opt)   Adjustable, 500cc   to 1000cc

Sample Transport Velocity

•  Minimum of 3 ft/s at 20 ft of lift (3/8” ID intake)

•  Minimum of 3 ft/s at 16 ft of lift (5/8” ID intake)

Metering Chamber

•    500cc capacity, clear acrylic, calibrated in 100cc’s

       (opt) 1000cc capacity, clear acrylic, calibrated in 100cc’s

       (opt)    500cc capacity, glass (Pyrex), calibrated in 100cc’s

       (opt) 1000cc capacity, glass (Pyrex), calibrated in 100cc’s

Volume Control Tube

•  316 stainless steel

Metering Chamber Level Electrode

•  316 stainless steel

Intake Hose

•  Nylon reinforced PVC, 3/8”ID by 25’ c/w sinker

       (opt)   Nylon reinforced PVC, 5/8”ID by 25’ c/w sinker

       (opt)   Teflon lined Tygon, 1/2”ID by 25’ c/w SS sinker

Discharge Hose

•  Latex, 3/8” ID

       (opt)   Latex, 5/8” ID

       (opt)   Silicone, 3/8” ID

       (opt)   Silicone, 5/8” ID

Sample Containers (composite only)

       (opt)   2.0 US gallon (   8 litre) high density polyethylene

       (opt)   5.0 US gallon (20 litre) high density polyethylene

       (opt)   2.5 US gallon (10 litre) glass

Sample Containers (discrete only)

•  24 x   500cc polyethylene

       (opt)   12 x   500cc glass

       (opt)     8 x     1 litre glass

       (opt)     6 x    2 litre glass

       (opt)     4 x    4 litre glass

       (opt)     3 x 10 litre glass

Refrigerator

       (opt)    5 cu. ft., adjustable to maintain 4 ° C

Available displays

•  Real time clock

•  Process timing (elapsed, remaining)

•  Process totals

•  Pulse counting (internal/external)

•  Event response (with time stamp)

•  Flashing prompts

Automatic displays

•  Container full (sample program complete)

•  Fault (program not complete)

•  Interrupt (program resumed)

•  Alternating time stamp

•  Cycle(s) abandoned

Enclosure

•  Outdoor installation ( BVS series): Nema 3 weatherproof

                14 gauge steel enclosure with heat cured polyester based

                 powder paint for corrosion resistance and lockable door

•  Indoor installation ( CVS series): Nema 1 general purpose

                14 gauge steel enclosure (upper control section only) with

                 polyester based powder paint for corrosion resistance.

Supply Voltage

•  Sampling system: 115 Vac / 60Hz or 12 Vdc

•  Refrigeration and heating units: 115 Vac / 60Hz