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High Volume / Respirable Dust Samplers
Polltech provides a range of models with two sampling inlets (Gable Roof or SSI), different types of Blowers and various options of flow measurement & control module with and without constant flow controller. All samplers, for measurement of SPM or TSP are designated as model PEM-HVS - 1 to 8 while samplers for measurements of RSPM (PM-10) are designated PEM-RDS - 1 to 8. The RDS models come with SSI as standard sampling inlet & Gable Roof as optional. By replacing SSI with Gable Roof, the RDS models can be converted to equivalent HVS models for measurement of SPM.
All HVAS for SPM use Gable Roof as per US EPA / CPCB specifications & therefore collect particles less than 100µ on filter paper, while all HVAS for RSPM use Size Selective Inlet for collections of Respirable particles less than 10µ on filter paper. The larger particles are removed in the SSI. Polltechs all models of HVAS for RSPM are therefore similar to SPM models. The only difference therefore is use of SSI in lieu of Gable Roof, all other specifications remaining same. Polltech all RSPM samplers can also be used for measurement of SPM if SSI is replaced with a Gable Roof. The Gable Roof can be ordered optionally & changeover takes only few minutes. All models for SPM can be also be modified at a later stage by installing the SSI. The SSI Kit is also available optionally & comes with complete set of instructions & required accessories.
Common Salient Features
- Microprocessor based Electronic Control Module
- Alphanumeric 32 character LCD Module
- Electronic Timer Cum Time Totalizer
- Delay & Sampling Time
- Orifice Plate at exhaust
- Data storage in Non-volatile memory
PrincipLE of Operation Suspended particles in the air are sampled at constant sampling rate of 1.13 m3/min through the circumferential entry of the size selective inlet. The circular design ensures wind direction insensitivity and the inlet design as well as the internal configuration makes the collection efficiency independent of low wind speeds. The particles are then accelerated through multiple circular impactor nozzles. By virtue of their larger momentum, particles greater than 10µ impact on to the greased collection plate. The particles smaller than the 10µ are carried vertically upward by the air flow and down the multiple vent tubes to the 8 x 10 inch hi-vol filter, where they are collected. The SSI is US EPA approved reference method & meets European, Australian & Japanese standards. BLOWERThe two types of suction blowers are high-speed carbon brush type AC/DC blower, and Brushless Blower with AC Motor. The brush types are also available in two models i.e. KPT 350 & KPT 600. The low flow capacity 350-watt blower is used only in model PEM-HVS-2 or PEM-RDS-2 while high flow capacity model KPT-600 is used in Model PEM-HVS (RDS)-5 & 7. The AC motor driven Brushless Blowers are also available in two variants. The higher capacity model uses belt driven blower operating at high speed, The lower capacity model uses a Low speed (2850 RPM) regenerative blower directly coupled to AC motor and therefore has very low noise (NL) . These blower options are available for models PEM-HVS (RDS) -1,4,6 & 8. Those models which uses NL blower are suffixed with NL i.e. PEM-HVS (RDS) – 1,4,6,8 (NL). Four types of blowers are available as described below
Brush type Blower BT 1
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KPT make Continuous duty 350 W
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Brush type Blower BT 2
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KPT make, High capacity, continuous duty, 600 W
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Brushless Blower BL 1
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Low noise Centrifugal Blower coupled to AC Motor with Belt in a separate housing along with 2†dia Hose connection for connecting to Mini Cabinet
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Brushless Blower NL 1
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Very low noise maintenance free Centrifugal regenerative blower directly coupled to Motor, mounted in the HVS Standard Cabinet.
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Flow Measurement System The air flow is not directly measured, instead it is inferred from the differential pressure measured across the orifice plate installed at the blower exhaust. Two types of devices for measurement of the differential pressure and the corresponding flow computation methodology are used. U-tube manometer along with a calibration graph of DP (cm WC) Vs. Flow is used for low cost models ECM1 & ECM2. The advanced models use Solid State pressure sensor with an internal look-up table to display digitally the flow & volume (ECM 4 onwards). Electronic Control Module The electronic control module is the brain of a sampler. It controls the operation of the sampler. Different models provide different mixes from among a host of functions including timing, time totalizing, flow measurement, temperature and pressure correction, blower speed control, volume computations and user interface etc. All control modules are microprocessor based with non-volatile memory so as to restore the sampling operation in case of power interruptions and also store the Set & Run time along with other parameters. They vary in their sophistication & features. Specifications Model ECM 1 (for BL1 & NL1 Blower)
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Electronic Timer cum Time Totalizer
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Display
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32 character (2 lines x 16 character) backlit LCD Module.
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Keys
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7 Nos.
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Delay Time
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Settable Up to 99 Hrs. 59 Min. on LCD Module.
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Sampling Time
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Settable Up to 99 Hrs. 59 Min. on LCD Module.
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Electronic Time Totalizer
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Up to 99 Hrs. 59 Min. on 4 digit LCD Module.
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Automatic Sampling Control
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Fully programmable electronic timer to automatically shut off system after preset time interval.
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Flow Measurement
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With an exhaust orifice and a U tube manometer mounted on the inside of the instrument. Individual Calibration graph provided
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Flow Setting
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Fixed as per Brushless Blower design
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Flow Control
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NIL.
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Additional Features
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Flow Switch to stop timer in case of no flow
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Model ECM 2 (for BT1 Blower) Same as ECM 1 except
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Flow Setting
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Through keys to change the flow rate from 0.6 m3 / min to maxi. flow
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Model ECM 3 Discontinued Model ECM 4 (for BL1 & NL1 Blower) Same as ECM 1 except
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Flow Measurement
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With exhaust orifice & pressure sensor.
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Flow Range
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0.6 to 1.8 m3/min on digital display
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Volume
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9999 m3/min on digital display
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Additional Features
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average, min. & max. values of flow along with time of sampling & volume collected is stored in memory
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Safety Features
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Automatic Stoppage of Sampling due to under voltage / over voltage / low flow & high Flow conditions
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Model ECM 5 (for BT2 Blower) Same as ECM 1 except
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Flow Measurement
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With exhaust orifice & pressure sensor.
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Flow Range
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0.6 to 1.8 m3/min on digital display
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Flow Setting
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On Digital Display Range 0.6 to 2.2 m3/min
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Flow Control
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Within 2% of set Value with Constant Flow Controller irrespective of dust load & main voltage variation.
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Volume
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9999 m3/min on digital display.
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Additional Features
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Digital Display of Average / Min. / Max. / Constant Flow Volume / Non Constant Flow Volume & their respective time information in Hrs. & Min.
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Safety Features
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Automatic Stoppage of Sampling due to under voltage / over voltage / low flow & high Flow conditions
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Model ECM 6 (for BL1 & NL1 Blower)
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Display
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32 Character Alphanumeric LCD Module with blue backlit
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Keys
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6 Nos.
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Delay Time
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Programmable with Real Time Clock
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Sampling Time
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Programmable upto 999 hrs. 59 mts. With Real Time Clock
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Electronic Time Totalizer
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Upto 999 hrs. 59 mts.
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Automatic Sampling Control
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Fully programmable electronic timer to automatically shut off system after preset time interval. Timer stops if there is no flow.
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Flow Measurement
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With exhaust orifice & D P pressure sensor Range : 0.25 to 2.5 m3/min
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Flow Rate
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From 0.25 to 2.50 M3 / Min on digital display
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Volume Totalizer
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Upto 99999 M3 STP Corrected on digital display.
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Temperature Measurement
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Solid State Temperature Sensor for STP correction
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Additional Features
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Storage of all data including sampling time, volume, minimum, maximum flow, the minimum & maximum ambient temp. etc. for 10 sample nos.
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Safety Features
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Automatic Stoppage of Sampling due to under voltage / over voltage / low flow & high Flow conditions
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Model ECM 7 ( for BT2 Blower ) & Model ECM 8 ( for BL1 & NL1 Blower )
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Display
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32 Character Alphanumeric LCD Module with blue backlit
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Keys
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6 Nos.
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Delay Time
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Programmable with Real Time Clock
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Sampling Time
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Programmable upto 199 hrs. 59 mts. with Real Time Clock
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Electronic Time Totalizer
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Upto 199 hrs. 59 mts.
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Automatic Sampling Control
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Fully programmable electronic timer to automatically shut off system after preset time interval. Facility for programming ON / OFF Time in cyclic mode.
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Flow Measurement
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With exhaust orifice & D P pressure sensor
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Flow Setting Range
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On Digital Display Range 0.6 to 1.6 m3/min
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Flow Control
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Within 2% of set Value with Constant Flow Controller irrespective of dust load & mains voltage variation.
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Volume Totalizer
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Upto 9999 M3 STP Corrected on digital display.
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Temperature Measurement
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Solid State Temperature Sensor for STP correction
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Additional Features
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Storage of all data including sampling time, volume, minimum, maximum & average flow / Constant Flow Volume / Non Constant Flow Volume & their respective time information in Hrs. & Min. Also minimum & maximum ambient temp. etc. for 10 sample nos.
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Facility to store sampling flow data value for every 1 minute in memory for 24 Hrs.
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RS 232 Cable provided for transferring the data to PC with the software provided on CD .
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PC Software includes facility to acquire & save data from control module including flow data & power interruptions for further processing & plotting flow data in circular chart format indicating flow variation over 24 Hrs. It also facilitates programming all sampling parameters including Start & Stop time etc.
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Safety Features
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Automatic Stoppage of Sampling due to under voltage / over voltage / low flow & high Flow conditions
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General Specifications for all models
Filter Holder
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SS 304 to accommodate filter paper of 25 x 20 cm
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Filter Media
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Whatman GF/A or EPM – 2000
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Particulate Sample
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For RSPM (i.e. <10µ ± 1µ) using size selective inlet at 1.13M3/Min
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For SPM (i.e. <100µ) with Gable Roof
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Size Selective Inlet
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For RSPM measurement Standard for all RDS models
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Gable Roof
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For SPM measurement Standard for all HVS models & Optional for all RDS models
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Gaseous Sampling
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Flow Rate
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0 to 3 LPM
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Flow Control
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Four way acrylic manifold with four inlet and one outlet and four stainless steel needle valve for flow control of each inlet.
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Rotameter
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0.3 LPM to 3 LPM with a resolution of 0.1 LPM.
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Sampling Train
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4 Nos. 35-ml glass impingers in an insulated cold box of Fibre Glass with drain.
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Mini Cabinet
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Made up of sturdy Powder Coated aluminum. Height 500 mm
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Standard Cabinet
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Made up of sturdy Powder Coated aluminum. Height 700 mm
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OPTIONAL Thermoelectric Cooled Gaseous Sampling Attachment With Thermoelectric Cooling arrangement for Impinger Tubes using Peltier cooling modules
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Cooling
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More than 150C below ambient
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Flow Rate
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0.3 to 3 LPM
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Flow Control
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Four way acrylic manifold with four inlet and one outlet and four stainless steel needle valve for flow control of each inlet.
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Rotameter
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0.3 LPM to 3 LPM with a resolution of 0.1 LPM
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Sampling Train
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4 Nos. 35-ml glass impingers in a double walled cold box.
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Operating Conditions
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Operating Temp : up to 400C
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Storage Temp. : Up to 600C
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RH : Up to 90% non-condensing
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Voltage Stabilizer VS 1
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For BT Blower Output : 230 V ±10% for Input Voltage : 175 V to 270 V AC
Under Voltage Cut off at 175 V, Over Voltage Cut off above 270 V
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Voltage Stabilizer VS 2
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For BL Blower Input Voltage Output : 230 V ±10% for Input Voltage : 175 V to 270 V AC Under Voltage Cut off at 175 V, Over Voltage Cut off above 270 V
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