product manual:
The main function of the safety barrier is to restrict the dangerous energy in a safe place from entering the dangerous place, that is, to limit the voltage and current sent to the dangerous place. Zener Z is used to limit the voltage. When the loop voltage is close to the safe voltage limit value, the Zener tube is turned on, so that the voltage across the Zener tube is always kept below the safe voltage limit value.
I. Overview:
This product is manufactured in accordance with the relevant standards of GB3836.1-2000 "Electrical Equipment for Explosive Gas Environment Part 1: General Requirements", GB3836.4-2000 "Electrical Equipment for Explosive Gas Environment Part 4: Intrinsically Safe Type "i", The explosion-proof mark is Ex[ib]ⅡCT6, which has been certified by the national designated quality inspection agency.
The SWP8083-EX thermal resistance isolated safety barrier converts the signal of the on-site 2/3-wire heating resistance into two standard 4-20mA (temperature linear) current signals isolated from it and transmits them to the safety side output.
2. Main technical performance:
Explosion-proof mark: Ex[ib]ⅡCT6
Intrinsically safe explosion-proof parameters: Uo=2.5V, Io=95mA,
Co = 6.5uF, Lo = 3.6mH,
Po = 0.3W, Um = 36VDC
Power supply voltage: 24VDC±10%
Power consumption: 1.8W (24V power supply, two 20mA output)
Hazardous area input: three-wire RTD ⑦+⑧-⑨-
Two-wire RTD ⑦+⑧- (⑨ shorted to ⑧)
Safety zone output: fully isolated two-way 4～20mA/1～5V DC (①+②-、④+⑤-)
Output load: ≤750Ω (internal 250Ω load)
Output accuracy: 0.2%F.S
Temperature drift: 0.01%F.S
Ambient temperature: +5℃～40℃
Relative humidity: 35%～85%RH
Storage temperature: -40℃～85℃
Weight: about 150g
Installation site: The surrounding air should be free of media that corrode chromium, nickel, and silver coatings.
Applicable on-site equipment: two- and three-wire heating resistors.
3. Wiring diagram
Four, installation method and installation size: use standard DIN rail
Five, installation notes:
1. Isolated safety barriers should be installed in non-hazardous locations.
2. The cross-sectional area of the soft copper wire leading from the isolated safety barrier to the site (hazardous location) must be greater than 0.5mm2.
3. The insulation strength of the connecting wire should be greater than 500V.
4. The wiring of the intrinsically safe end of the isolated safety barrier (marked with blue) and the circuit of the non-intrinsically safe end shall not be misconnected and confused. Intrinsically safe wires should use blue as the intrinsic safety mark. Intrinsically safe conductors and non-intrinsically safe conductors should be laid separately in the trunking, and their respective protective sleeves should be used. The intrinsically safe side of the isolated safety barrier must not be mixed with other power sources, including other intrinsically safe circuits.
5. When the isolated safety barrier and the primary instrument form an intrinsically safe explosion-proof system, they must be inspected and approved by an explosion-proof inspection agency designated by the state. SWP8000-EX series isolated safety barriers are provided by the National Explosion-proof Electrical Supervision and Inspection Office. The Co and Lo distribution parameters are relative to the allowable value of ∏C level (hydrogen level). For ∏B level environment, this parameter can be multiplied by 3 , For ∏A level environment, multiply this parameter by 8. When the transmission line uses cables of different specifications, its own cable parameters should be highly valued and should not exceed the specified value.
6. When the isolated safety barrier is energized and debugged separately, you must pay attention to the type of the isolated safety barrier, the polarity of the power supply, the voltage level, and the label on the terminal of the isolated safety barrier shell.
7. It is strictly forbidden to test the insulation between the isolated safety barrier terminals with a megohmmeter. If you want to check the insulation of the system line, you should first disconnect all the isolated safety barrier wiring, otherwise it will cause damage to internal devices.
8. All on-site instruments connected with isolated safety barriers shall be explosion-proof tests for relevant explosion-proof departments and instruments that have obtained explosion-proof certification.
9. If the internal module of the isolated safety barrier is damaged and needs to be repaired or replaced, in principle should be borne by the manufacturer. When repairing by yourself, the user should follow the relevant precautions, and the specific method should be carried out according to the maintenance chapter (the repair of intrinsically safe instruments should be carried out within the scope described, and the repairs outside should be with the manufacturer). It can be put into operation again after being repaired.
10. The installation, use and maintenance of the isolated safety barrier should be strictly in accordance with the relevant provisions of GB 3836.15-2000 "Electrical Equipment for Explosive Gas Environment Part 15: Electrical Installation in Hazardous Locations (Except Coal Mine)".
11. Products that have obtained explosion-proof certification are not allowed to replace components or structures that affect explosion-proof performance at will.