Burkert Type 8712 - Manual (Page 20)

20
Technicaldata
Type 8006, 8702
6.6. fluidic data
6.6.1. overview of measurement
specifications
type 8006, 8626 8702, 8712
full scale range ref. to
n
2 (l
n
/min)
16 … 1500 0.01 … 80
measuring accuracy
(after heating time) ± 1.5 % of the
measured value
± 0.3 % of the full
scale ± 0.8 % of the
measured value
± 0.3 % of the full
scale
span/control range 1 : 50 *) 1 : 50 **)
settling time (mfc) or
response time (mfm)
(ms) < 500 < 150
*) 1:20 in case of vertical mounting, with downward flow.
**) 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. However, to use an MFC with natural gas, only
the solenoid valve Bürkert type 2875 can be used : in this
case, the order key must include the letter "-D" (for example
8626-0100L-CH4-E-A-GM82-ALFF-D-08,0).
• Calibration fluid: operating fluid or air.
• Max. operating pressure: 10 bar (depending on valve nominal
diameter).
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):
• Maximum particle size and density: class 2:
Maximum particle size: 1 µm 1)
Maximum particle density: 1 mg/m³ 1)
• Maximum dew point 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
English