Bronkhorst®
Instruction Manual EL-FLOW® Prestige
9.17.084N
12
2.4
Piping requirements
For reliable performance, make sure the fluid stream is uncontaminated. If necessary,
use filters to assure a moisture, oil and particle free gas stream (recommended pore
size: 5 µm). If back flow can occur, the use of a downstream filter and check valve is
also recommended. Select a suitable filter size, to avoid a too high pressure drop.
·
Use piping or tubing that is suitable for the operating conditions of the application (media, maximum temperature,
maximum operating pressure).
·
Do not install small diameter piping/tubing on high flow rates and avoid abrupt angles or other disturbances within a
distance of 10 times the (inside) pipe diameter from the inlet or outlet of the device.
·
Do not install pressure regulators within a distance of 25 times the (inside) pipe diameter from a controlling instrument.
2.5
Fluid connection
·
Install the EL-FLOW® Prestige in the process line, in accordance with the direction of
the FLOW arrow on the base of the instrument.
·
Tighten connections according to the instructions of the supplier of the fittings. The
use of Swagelok RS-type stainless steel adapters is recommended.
Check the fluid system for leaks before applying full operating pressure, especially when using hazardous media (e.g. toxic
or flammable).
2.6
Electrical connection
Electrical connections must be made with standard cables or according to the
applicable hook-up diagram (see section
). The factory installed 9-pin
D-sub settings are indicated on the serial number label. Make sure that the power
supply is suitable for the power ratings as indicated on the serial number label, and
that double or reinforced insulation is used for the power supply cabling.
EL-FLOW® Prestige instruments are powered with +15…+24 Vdc, depending on the
fieldbus system (if applicable).
To comply with
IEC61010-1
requirements, limit the circuit current by using a limited-energy power source. A National
Electrical Code
(NEC) Class 2
power source must be used that complies with
IEC 60950-1
(Limited Energy Circuit).
As an alternative, the unit shall be supplied by a power source with reinforced insulation to mains in conjunction with a
fuse in accordance with
UL248
. The fuse shall be rated max. 3 A and must be installed in the 15…24 Vdc power supply to
the device in order to limit the available current.
