Spirax Sarco RIM20, Инструкция по установке и обслуживанию, Страница: 12 / 132

IM-P198-05 MI Issue 2 12
3.1 Installation overview
The RIM20 rotor insertion flowmeter installations are simple and straightforward. After
reviewing the installation requirements given below, see Section 3.4 for RIM20 installation
instructions.
Warning!
Consult the flowmeter nameplate for specific flowmeter approvals before any
hazardous location installation.
3.2 Flowmeter installation requirements
Before installing the flowmeter, verify the installation site allows for these considerations:
1. Line pressure and temperature will not exceed the flowmeter rating.
2. The location meets the required minimum number of pipe diameters upstream and
downstream of the sensor head as illustrated in Figure 2.
3. Safe and convenient access with adequate overhead clearance for maintenance purposes.
4. Verify that the cable entry into the instrument meets the specific standard required for
hazardous area installations. The cable entry device shall be of a certified flameproof
type, suitable for the conditions of use and correctly installed. The degree of protection
of at least IP66 to EN 60529 is only achieved if certified cable entries are used that are
suitable for the application and correctly installed. Unused apertures shall be closed with
suitable blanking elements.
5. For remote installations, verify the supplied cable length is sufficient to connect the
flowmeter sensor to the remote electronics.
Also, before installation check your flow system for anomalies such as:
-
leaks
-
valves or restrictions in the flow path that could create disturbances in the flow profile
that might cause unexpected flowrate indications
-
avoid areas where high RF, EMI, or other electrical interference may be present. Devices
such as VFD's (variable frequency drives), large ac motors, etc.
3.3 Unobstructed flow requirements
Select an installation site that will minimize possible distortion in the flow profile. Valves,
elbows, control valves and other piping components may cause flow disturbances. Check
your specific piping condition against the examples shown below. In order to achieve accurate
and repeatable performance install the flowmeter using the recommended number of straight
run pipe diameters upstream and downstream of the sensor.
Note: For liquid applications in vertical pipes, avoid installing with flow in the downward
direction because the pipe may not be full at all points.
Choose to install the meter with flow in the upward direction if possible.
3. Installation