Representative Sampling
Download
Report
Transcript Representative Sampling
Representative Sampling
By
Chuck Abbott
Automatic Samplers
Industry Sampler Needs
If sampler required, usually going to be refrigerated
Permit determines type of sampling needed and
frequency
Sequential sampling in multiple bottles
Composite samples
Permit determines if any additional monitoring is
needed
Flow pacing for flow proportional samples
pH monitoring and ability to enable sampler to take
sample on high or low pH event
Sequential Sampling
Usually done when monitoring
for specific events like slugs.
Used by enforcement to check
industry and determine pollutant
trending
Multiple bottles are used with the
standard being the 24 bottle
sampler.
One or more samples collected in
individual bottle each hour.
flexible enough to take
samples/bottle or multiple
bottles/sample
Pro Pak
•Alternative to
polypro bottles.
•Designed to
reduce bottle
cleaning cost
•Disposable
•Sequential bags or
composite bag
•Directly replaces
Polypro Bottles
Pre-treatment Trends
Pre-treatment groups
are moving towards
Portable Refrigerated
Samplers as well as
compact units such as
the GLS
Pre-Treatment group monitoring
needs.
Usually portable samplers
Normally use composite but have applications that call
for multibottle
Need flexible program capabilities
May need 2 part program
Flow proportional sampling
Sample enabled/ triggers based on events
Stored Data
Data can be stored in either 2105 or
6712 internal data logger
•Data Collected via Flowlink 5.1
Important features for Industrial
pre-treatment use
Accurate and repeatable volume deliver
Multiple bottle capabilities
Accurate liquid detection system
Able to take samples based on flow input or based on
time or a combination of imputs
Able to store sample, flow and other data that can be
retrieved later
Easy to maintain
Bottle Options
Sample Size and Frequency
Minimum sample volume
collected with an automatic
sampler should be no less
than 10 ml.
Recommended size is no less
than 50 ml because of
liquid detector
Sample volume repeatability
Volume required by lab
Bigger is better theory
Preventative Sampler
Maintenance
Pump tubing replacement
Suction line replacement
Container replacement
Diagnostic routines
Volume calibration
Pump Counter
Counts actual revolutions
Determines pump time
not related to time
not affected by battery
Specifiable Feature!
6712 Pump Tubing
Bands indicate position
bands won’t slip
Label for pump
shows installation, direction
0.25”
0.29”
Tubing Life Indicator
Set for 1,000,000 counts
Adjustable
site conditions
Maintenance tool
Industrial Monitoring
Integral monitoring of flow, level, pH, temperature
and SDI-12 parameters
Discreet bottle sampling
Flexibility in programming
2 part programming
Non-uniform time/ random time intervals
Time enables
Volume Delivery
LD90 and pump counter
Most accurate volumes
prevents biasing in samples
prevents overflows
+/- 5 ml repeatability
Types of Samples
Distribution
Composite
Single Bottle
Sequential
Multiple Bottles
Samples Per Bottle
Bottles Per Sample
Pacing
Time
Flow
Event
Types of Samples
Composite
Composite samples are
small volumes of sample
taken over time and
placed in a large
container.
Composite samples can
be taken in two ways,
fixed volume or flow
proportional
Composite
5
4
3
2
1
Sequential Sampling
Usually done when monitoring for
specific events like slugs.
Used by enforcement to check
industry and determine pollutant
trending
Multiple bottles are used with the
standard being the 24 bottle
sampler.
One or more samples collected in
individual bottle each hour.
flexible enough to take
samples/bottle or multiple
bottles/sample
Sequential Sampling
1
2
3
4
5
6
Two Part Programming
Part A
Part B
2
4
6
8
3
5
7
1
2
3
4
5
6
1
1
2
3
4
5
6
7
8
9
10
11-24
Sampler Pacing
Time
Uniform Time- Fixed Volume
Uniform Time- Volume Dependent
Uniform- Flow Dependent Volume
Non Uniform Time
Random Time
Flow
Flow Paced – Time Override
Trigger and Event Pacing
Challenging sampling application
accessories
Difficult to reach locations
Sampling from Pressurized lines
Sampling from Flumes and Weirs
Sampling in low flow conditions
Batch Dischargers and how to get a representative
sample.
Best Sampler Location
Accessibility
Close to source
Conserve power
Maintain line velocity
Reduce wear
Protect suction line
Minimize lift
Max lift- 8.5m/28ft
Auxiliary pump
Safety of Personnel
Security
Availability of Power Source
Good mixing for representative
samples
How to get best representative
sample
Use proper strainer size and
type
Keep intake tube short and
as vertical as you can
Keep sampler close to
sampling point
Change Pump Tubing when
needed.
Change intake tubing often
and keep clean
Strainer Placement -Flumes
Strainer Placement - Weirs
Strainer
location here
is not going to
enable a
representative
sample to be
taken.
Isco Flow Thru Chamber
Flow-thru chambers are
available for use in low
pressure (under 30 PSI) closed
pipe applications.
Suction Line Requirements
Similar to strainer
follow most stringent requirement
if glass needed, use Teflon suction line
clean and/or replace as needed
Pressurized Line Sampling
Teledyne Isco now offers
pressurized sampling
systems to allow sample
collect from pressure
lines less than 300 psi.
Spa Products
Specially developed products to
help meet you sampling needs:
•Black Vinyl Suction line
•Ultra Low flow strainer
•Customer support hangers
such as the Pro Hanger
•Remote pump option
Low Flowing Pipes
Low Flow Strainer
1/4” to 3/8”
¼” suction line
Batch discharging and
representative sampling
When taking a sample
from any source it must
be representative of the
source.
Sampling a batch
discharger best done
with flow proportional
sampling method
Liquid level indicator or
trigger based on level or
rate of change
Batch discharge example with flow paced
sampling when triggered by level increase
Alarming
Both discreet and digital
alarms available
•SPA 697 for contact
closure
•SPA 1489 CDMA Modem
•SMS Alarms
Remote Communication
Remote Communication
through 2105 C Module as
well as SPA 1489 CDMA
Modem
Any Questions?