March 2010 Hastings Product Training Flow Products Overview.
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Transcript of March 2010 Hastings Product Training Flow Products Overview.
March 2010
Hastings Product Training
Flow Products Overview
March 2010 2
Agenda
• Thermal mass flow basics
• Hastings flow product overview
• Product selection
• Typical applications
March 2010 3
Glossary of Terms
• Thermal mass flowmeter– Measures the mass flowrate of a fluid (liquid or gas)
by measuring thermal energy transfer– Hastings only manufactures gas flowmeters
• Flow controller– Combines a thermal mass flowmeter with a PID loop
and flow control valve
March 2010 4
Mass Flow vs. Volumetric Flow
• Unlike liquids, gases do not have constant volume
• Volumetric flow changes with:
Temperature Pressure
March 2010 5
Mass Flow vs. Volumetric Flow
• Mass flow is independent of temperature and pressure changes.
• Measure the mass of the gas or number of molecules of gas
• True mass units can be expressed as:– lb/hr, gm/sec, etc.
• Can also be expressed as a standard volumetric flow unit:– SCCM, SLM, SCFM, etc.
March 2010 6
Mass Flow vs. Volumetric Flow
• Standard volumetric flow units look like volumetric flow units, but they are mass flow units.
• Standard units are referenced to STP– Standard Temperature and Pressure
• STP must be defined– Hastings standard temperature = 0
O
C– Other temperatures are possible, but must be
referenced on the order (and on quote)– Pressure reference is always 760 Torr (1 ATM)
March 2010 7
Mass Flow vs. Volumetric Flow
• With STP values, you can convert from mass flow to volumetric flow:
• Note: Temperature and Pressure are absolute– T (Kelvin) =
O
C + 273.15– PSIA = PSIG + 14.696
• Example?
(for 0O
C vs. 20O
C)
2Flow=1T2T
×2P1P
×1Flow
March 2010 8
Typical Mass Flow Meter
Base
Shunt
Sensor
March 2010 9
Typical Mass Flow Sensor
This design is used in the 200 Series products.
Constant temperature heater
March 2010 10
Constant T Sensor
300 Series Sensor
March 2010 11
Flow Control
• Standard valves are normally closed (spring)
• Use PID loop to adjust valve voltage required to open the valve
• Orifice is a fixed variable in flow control equation
• THI requests Upstream and Downstream pressures to size orifice for proper flow control
March 2010 12
2-Stage Valve
Pilot Flow Qp
Pd
Bleed Flow Qb
Pu
Pb
Main Flow Qm
*Larger flows require a 2-stage valve*Used on HFC-203/303/307
March 2010 13
Questions?
March 2010 14
Flow Product Overview
• Ranges from: – 0 - 5 SCCM to– 0 - 15,000 SLM
• Analog and Digital models• Extensive product offering
to cover a wide range of applications
March 2010 15
200 Series
• Ranges– HFM-200/HFC-202
• Min: 0 – 10 SCCM N2• Max: 0 – 25 SLM N2
– HFM-201/HFC-203• Min: 0 – 25 SLM N2• Max: 0 – 500 SLM N2
• Simple / reliable design• Accuracy: ± 1% FS• Average response time,
but very stable
March 2010 16
HFM-200 with LFE
• LFE: Laminar Flow Element• Ranges
– Up to 15,000 SLM N2
• Uses HFM-200• Accuracy: ± 1% FS• Low pressure drop
March 2010 17
300 Series
• Ranges– HFM-300/HFC-302
• Min: 0 – 5 SCCM N2• Max: 0 – 25 SLM N2
– HFM-301/HFC-303• Up to 1,000 SLM N2
– HFM-305/HFC-307• Up to 2,500 SLM N2
– HFM-306 (Custom Product)• Up to 8,000 SLM N2 @ ± 3% FS
• Accuracy: ± 1% FS*• Fast response time• Metal seals on HFM-300 & 305
– Kalrez valve seat on HFC-302
• Foldover protection• Lower dP than 200 Series
* ± 0.75% for FS below 10 SLM
March 2010 18
Digital 300 Series
• Ranges– HFM-D-300/HFC-D-302
• Up to 25 SLM N2
– HFM-D-301/HFC-D-303• Up to 1,000 SLM N2
– HFM-D-305/HFC-D-307• Up to 2,500 SLM N2
• Based on 300 Series• Accuracy:
± (0.2% FS + 0.5% Rdg)
• RS232 / RS485• ± 12, ± 15, 24 vdc• Many built-in features
– Totalizer, multiple gas calibration
March 2010 19
400-I Series
• Ranges– HFM-I-401
• Up to 350 SLM N2– HFM-I-405
• Up to 2,500 SLM N2
• IP65 Enclosure / Hazardous Location Approval
• Accuracy:Standard: ± 1% FSPolynomial: ± (0.2% FS + 0.5% Rdg)
• RS232 (std), RS485, or EtherNet• Analog output (always present)
– 4-20 mA (std)– 0-5 vdc, 0-10 vdc, 0-20 mA, 1-5 vdc
• 24 vdc or ± 15 vdc power• Many built-in features
– Totalizer, multiple gas calibration
March 2010 20
Power Pods / Power Supplies
• THPS-400– Up to Qty(4) HFM or HFC– RS232/RS485– Ratio control– Totalizer
• THPS-100– One HFM or HFC– RS232– 2 high / 2 low setpoints
• Model 40– Up to Qty(4) HFM
March 2010 21
NALL Series
• Ranges– Up to 15,000 SLM N2
• 316SS and Monel• 100
O
C std. / 200O
C opt.• Hermetically sealed
transducer option• Low pressure drop
version available upon request
March 2010 22
Product Selection
• Select flow product based on– Range– Material compatibility– Temperature / Pressure compatibility– Response time– Pressure drop considerations– Features required– Environmental considerations
• Do not oversell!• Specify (on quote & order): range, gas, and STP
reference (and upstream/downstream pressures for flow controllers)
Sales tools available
March 2010 23
Typical Applications
• Leak testing– Castings, fabrications, filters, aircraft components,
valves, building supplies, automotive components
March 2010 24
Typical Applications
• Flow performance testing– Respirators, aircraft components, air tools,
flowmeters, gas appliances, fuel cell
March 2010 25
Typical Applications
• Gas blending
• Gas samplers / analyzers
• Flame spray
• Any application where gas measurement is critical
March 2010 26
Questions?
March 2010 27
Sales Support Tools
• Sizing Sheets
• Material Compatibility
• Gas Conversion Factor (GCF)
• Pressure Drop