- The sampler is suitable for automatic collection
and preservation of composite or discrete non-toxic or toxic liquid
samples.
- The controller enclosure is made of structural
resin with NEMA 4X/NEMA 6 ratings.
- All wetted parts have a minimum ID of 3/8 inch,
and are stainless steel or PVC (optional strainer) PVC or Teflon
(sampling hose), and silicon rubber (pump tubing).
- A high-speed 3/8 inch ID peristaltic pump with
two rollers of at least 0.7 inch (17.78 mm) in diameter is incorporated
to increase tubing life. Pumps using smaller rollers will not be
used to increase pump life. Samplers that do not use such a mechanism
are not acceptable. The pump body is constructed of corrosion and
impact resistant Delrin. The pump mechanism has a clear cover plate
which enables visual inspection of rollers, pump spindle, and tubing.
Samplers requiring removal of part or all of its pump housing for
visual inspection will not be acceptable
- The sample liquid must be under forced flow at
all times and shall not pass through a metering chamber, valves
or distribution plate. The sampler is equipped with a liquid sensing
system that calculates the flow rate of the liquid in the intake
line each collection cycle.
- The sampler enables field conversion to provide
composite or discrete sampling without using special tools.
- The sampler collects composite an/or discrete samples.
For composite sampling an overflow protection mechanism shall automatically
terminate any further sampling. Discrete sampling can be multiple
bottles of the same sample or multiple samples in multiple bottles.
- Systems relying upon sensing bottle weight to determine
sample volume shall be unacceptable due to the variance in sample
densities, and the need to calibrate the weight sensing mechanism.
- Bottle-full condition is detected by using a stainless
steel sensor located in the bottle neck. It is easily removable
for cleaning or replacement without using special tools.
- The sampler is capable of EPA recommended transport
velocity of 2 ft./sec through 3/8 inch ID tubing at a draw height
of 5 feet using the 3/8 inch ID pump. The sampler has an optional
weighted strainer of PVC or stainless steel.
- A hermetically sealed 24-button keypad and a 2-line
by 20-character alphanumeric backlit LCD is linked to a programmable
CPU.
- Sample bottle(s) are located below the controller
in a carbon steel refrigerator (with iron phosphate pretreatment
covered by baked acrylic enamel) or a stainless steel refrigerator.
The refrigerator condenser is made of carbon steel with baked enamel
finish. Copper refrigerant lines are coated with asphalt cork tape
for protection from hydrogen sulfide gas attack. A thermostat included
within the refrigerator ensures that a temperature of 4OC is maintained.
The evaporator coils are rolled aluminum with baked acrylic enamel
finish. The fan motor is unit bearing.
- The 475 BTU compressor has a high efficiency fan
and condenser arrangement permitting reliable operation in high
ambient temperatures. Foam insulation forms a CFC-free polyethylene
with an interior of food grade ABS.
- The sampler does not use unique symbols or codes
for programming or to indicate operating conditions. The software
is menu driven, prompting input of requested information using the
keypad. The display indicates each programming step. After entering
data the system automatically advances to the next programming step.
- A password feature restricts access to authorized
persons only.
- A sampling program can be delayed by entering the
number of hours and minutes for the sampler to count down, or the
number of contact closures to occur. The delay is independent of
the sampling interval.
- The sampler purges the sample hose immediately
prior to and following each sample. Purge duration is selectable.
- The sampler has the capability to rinse the sample
hose with source liquid prior to each sample selected by user.
- If a sample is not obtained on the first attempt,
it immediately retries to collect the sample. If the sample still
cannot be collected, the sampler will omit that sample and then
continue the sampling sequence
- When initiated by a keystroke, the sampler is
capable of manual sampling independent of a programmed sequence.
The sampler logs manual collections, and is selectable to allow
taking test samples:
- Only when the sampler is not running a program.
- During a program but the test samples are
not counted as a sample.
- During a program and the test samples count
as a sample
- In time mode, the interval between samples are
adjustable (1-9999 min. in 1 min increments). In the flow mode,
it accepts and totalizes contact closures (1-9999), a 12 VDC pulsed
input or a 4-20mA DC analog signal input for sampling at a user
set point.
- A hydrologic event algorithm is used to enable
sample programming based on a combination of parameters including
water level, differential (rising and falling) water levels, and
time defaults as established by the U.S. Geological Survey for hydrologic
events.
- Operating status is reviewed with minimal effort,
and includes: program status, current time, time and date program
started, active bottle number, active group period, number of samples
collected, volume collected, number of contact closures, number
of line blockages, minutes or flow signals remaining to the next
sample, number of samples remaining, volume remaining, and time
to override. All program settings are reviewed in addition to seeing
the review of the completed program. Diagnostics for RAM, ROM, pump
and distributor is included.
- The entire refrigerated sampler is closed in an
optional weather-resistant NEMA 3R outdoor enclosure made of fiberglass-reinforced
polyester and insulated with 0.75 in. (19.05 mm) polyurethane. It
is equipped with a full-size gasketed door with lockable latch,
duplex outlet, air vents, and access holes for the sampling hose.
It shall also include any or all of these: an optional heater wit
thermostat suitable for operation to –40°F outside temperature,
an optional light and/or fan.
- This sampler is a Manning Model YB-series.
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