IM-P198-02
MI Issue 5
22
4.1 General information - Electrical installation
The electronics within the RIM10 Series rotor insertion flowmeters amplify and convert the
raw turbine flow signals into a number of different analog output signals. Available outputs
are:
-
Square wave pulses
- Raw or adjusted flow frequency.
- The open-collector output circuit drives inductive loads up to 60 Vdc.
-
4-20 mA current loop
- Volumetric, mass, energy flow values, pressure, temperature.
Flow information is also available in digital format. The available interfaces are:
-
Modbus RTU
- Half-duplex RS-485
-
Modbus TCP/IP
- Full-duplex, 10/100 BaseT Ethernet
-
Http Interface (Web)
- Virtual front panel display and set-up wizard using Internet Explorer 6.0 or later on a
standard PC
The electronics within the RIM10 Series rotor insertion flowmeters are housed in a cast
aluminum condulet housing. The condulet is rated for Class I, Div II environments. All field
wiring to the flowmeter is connected to the terminal blocks and RJ-45 network port located
beneath the rear screw cover (opposite end to the display).
Wiring recommendations
Using the correct wiring is essential to achieving satisfactory performance and reliability.
Spirax Sarco recommend the following:
1.
Use shielded wire for all inputs and outputs. For example, use Belden 9451P for
4-20 mA current loops, especially in noisy electrical environments.
2.
Select the correct wire gauge. 0.52 mm
2
- 0.20 mm
2
(20 - 24 AWG) stranded wire is
recommended. For Ethernet and Modbus RTU, Cat 5, Cat 5e, or Cat 6 type cable is
recommended, such as Belden 1624P.
Interface
Recommended cable
Maximum cable length
RS485
Belden 9841
1 220 m (4 000 ft)
4-20 mA current loop
Belden 9451P
300 m (1 000 ft)
Pulse out
Belden 82842
300 m (1 000 ft)
Ethernet
Belden 1624P
100 m (328 ft)
Relay out
Belden 9504
300 m (1 000 ft)
Remote head
Belden 9504
30 m (100 ft)
Hum and noise
Although the RIM10 is designed to operate reliably in industrial environments, the maximum
run length for the 4-20 mA current loop input sensors and Modbus RTU over RS485 may
be reduced due to noise and noise pickup along the cable. The use of properly grounded
shielded twisted pair (STP) cable helps to limit the effects of interference in most cases.
The electronic signal within a cable can suffer from electrical interference if near to
electrically noisy equipment, such as welder and motor drives. If the cable is near to such
equipment, the cable should be run inside a grounded conduit to protect it.
4. Electrical installation