Sierra Instruction Manual Smart-Trak
®
2 Series 100
88
Performance Specifications—Micro-Trak
Accuracy
+ 1% of full scale including linearity at operating conditions
Dial-A-Gas
+ 1% of full scale in all 10 standard gases
Repeatability
+0.2% of full scale
Temp Coeff
+0.025% of full scale per ºF (+0.05% of full scale per ºC) or better
Pressure coeff
+0.01% of full scale per psi (+0.15% of full scale per bar) or better
Response Time
Governed by total volume of installation. If suggestions above are followed, response
time will be similar to all other Smart-Trak 2 instruments.
Operating Specifications
All clean gases, including corrosives and toxics. The following 10 gases make up the
standard Dial-A-Gas feature. Alternate gases may be substituted at time of order.
Mass Flow Rates
Gas Micro-Trak
Flow
Range (sccm)
Air 0.10
–
4.0
Argon 0.14
–
5.6
CO
2
0.074
–
2.95
CO 0.10
–
4.0
Methane 0.075
–
3.0
Helium 0.14
–
5.6
Hydrogen 0.10
–
4.0
Oxygen 0.10
–
4.0
Nitrogen 0.10
–
4.0
N
2
O 0.072
–
2.9
Note: flow rates specified at 21ºC and 760 mm Hg.
Other engineering units are available.
Gas Pressure
500 psig (34 barg) maximum pressure; burst tested to 750 psig (52 barg)
Pressure Drop Across a Micro-Trak Meter
0.36 psi (24.5 mbar) with 1/8 inch compression fittings
Differential Pressure Requirement for Micro-Trak Flow Controllers
30 psi (2040 mbar) optimum
1 psi (68 mbar) minimum with 1/8 inch compression fittings