Burkert Type 8715 - Manual (Page 18)

18
Technicaldata
Type 8700, 8701, 8703, 8705
6.6. fluidic data
6.6.1. overview of measurement
specifications
Device
types
Full scale range, ref. to N2 (lN/min) Measuring accuracy (after heating time) Span/control range Settling time (MFC) or response time (MFM) (ms)
8700, 8710
0.01 … 15
± 1.5 % of the
measured value
± 0.3 % of the full
scale 1 : 50 < 3000
8705, 8715
8701, 8710
0.01 … 80
± 0.8 % of the
measured value
± 0.3 % of the full
scale 1 : 50 *) < 300
8703, 8713
*) Higher span (e.g. 1:100) possible on request
Repeatability: ± 0.1% of the full scale.
6.6.2. operating fluids
• Operating fluids: clean, dry gas.
• Operating fluid for UL devices: neutral, uncontaminated gas. Other
hazardous gases are possible on request; the devices do not
release any hazardous gases under normal operating conditions.
• Calibration fluid: operating gas or air.
• Max. operating pressure: 10 bar (depending on the nominal size of
the valve).
To obtain the required measuring accuracy or control quality,
but also to respect the safety requirements, the gas or
gaseous mixture must conform to the following safety criteria,
compliant with ISO standard 8573-1 (Compressed air -
Part 1: Contaminants and purity classes):
• Particle size and maximum density: class 2:
Maximum particle size: 1 µm 1)
Maximum particle density: 1 mg/m³ 1)
• Maximum dewpoint under pressure: class 4: 3°C
• Maximum oil concentration: class 1: 0.01 mg/m³
1)
1) For more information refer to ISO 8573-1
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