4. The Electrical Connection
(4~20)mA/HART (Two wire system)
The power supply and the output current signal sharing a two core shield cable. The supply voltage range see technical data. For intrinsically safe type must be a safety barrier between the power supply and the instrument.
|(4~20)mA/HART(Four wire system)|
Separate power supply and the current signal, respectively using a two-core shielded cable. The supply voltage range see technical data.
|Modbus - RS485(Four wire system)|
Power supply and Modbus signal line separated respectively using a two-core shielded cable, the power supply voltage range see technical data.
Supply cable can use ordinary two-core cable, the cable diameter should be (6~12) mm, to ensure that the cable entry seal. If electromagnetic interference exists, recommended to use shielded cable.
(4～20) mA /HART（Two-wire）
Supply cable can use ordinary two-core cable.
(4～20) mA /HART（Four-wire）
Supply cable should be used with a dedicated ground cable
Shielded cable should be used for the power supply cable.
|Shielding and wiring|
Both ends of the shielded cable should be grounded. Inside the sensor, the shield must be connected to the internal ground terminal. The external ground terminal on the enclosure must be connected to the ground.
If there is ground current, the shielded cable must be grounded through a ceramic capacitor (for example: 1nF/1500V) far away from the shielding end of the instrument side to block direct and bypass high-frequency interference signals.
Ø 24V two wire wiring diagram as follows:
Ø 6~24V Modbus-RS485 wiring diagram as follows:
The explosion-proof form of this product is intrinsically safe.The intrinsic safety version sensors (Exia Ⅱc T6) use Alu-die casting housing and filling Silicone rubber sealants internal structure aimed to prevent sparks resulted from circuit failure from leaking out. It is applicable for the continuous level measurement of flammable medium under Exia Ⅱc T6.
A safety barrier FBS-2 must be used together with the intrinsic safety instrument. It is an associated device to this product for the power supply of this product. The main specification is intrinsic safety: ExiaⅡc, voltage of power supply: 24V DC±5%, short-circuit current: 135mA, operating current: 4...20mA.
All cables must be shielded. The max length is 500m for the cable from the barrier to the sensor. Stray capacitor≤0.1μF/Km, stray inductance 1mH/Km. Instrument must be connected to the ground potential. Any unapproved associated device is not allowed to be used.
Ø Please observe the local electrical code requirements!
Ø Please comply with local requirements for personnel health and safety regulations.
All electrical components of instrument operation must be completed by the formal training of professionals.
Ø Please check the instrument nameplate to provide product specifications meet your requirements. Please make sure that the power supply voltage and instrument nameplate on the requirements.
This meter fully meets the requirements of protection class IP66/IP67, please ensure the waterproof characteristics of the cable seal. As shown below:
How to install to meet the requirements of IP67:
Please make sure that the sealing head is not damaged.
Please make sure that the cable is not damaged.
Please make sure that the cable for use with electrical connection specification.
Cable into the electrical interface before its curved downward, ensure that the water will not flow into the shell, see the①
Tighten the cable seal head, see the②
Please electrical interface will not use blind plug tight, see the③