Because the distance between the field and the control room is far, when the resistance of the connecting wire is large, if the voltage source signal is transmitted remotely, due to the partial pressure of the wire resistance and the input resistance of the receiving instrument, a large error will be generated. The reason why the signal current source is better than the voltage source is because the distance between the field and the control room is far, and when the resistance of the connecting wire is large, if the voltage source signal is transmitted remotely, due to the partial pressure of the wire resistance and the input resistance of the receiving instrument, A large error will be generated, and the constant current source signal is used as the remote transmission. As long as the transmission loop does not branch, the current in the loop does not change with the length of the wire, thereby ensuring the accuracy of the transmission.
2. Reasons for selecting the maximum current of the signal 20MA The selection of the maximum current 20MA is based on: safety, practicality, power consumption, and cost considerations. Safety spark meter can only use low voltage and low current; comprehensively consider the connection distance between the production field instruments, the load and other factors; there are power consumption and cost issues, requirements for electronic components, power supply requirements and other factors. .
three. The reason why the starting point of the signal is 4 mA is 4 mA. The two-wire system is mostly two-wire system. The two-wire system is that the power supply and the load are connected in series, and there is a common point, and the signal communication and power supply between the field transmitter and the control room meter. Use only two wires. Why is the starting signal not 0MA? This is based on two points:
1. The transmitter circuit will not work without static working current, and the signal starting current is 4mA.DC is the static working current of the transmitter.
2. At the same time, the instrument's electrical zero point is 4mA.DC, which does not coincide with the mechanical zero point. This “live zero†is helpful for identifying faults such as power failure and disconnection.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Characteristics and Advantages
(1) Intelligent control design: adjustable main parameter and secondary parameter automatically according to the weight of door leaves;
(2) Low noise: Special static sound track, integration of motor, worm-gear and retarder.
(3) Anti-clamping function: automatically reverse when meeting barriers;
(4) Unique electronic motor lock: the motor will lock up when the door is forced to open.(controlled by remote or switch)
(5) Tighten force: seal door when closed, power consumption approximately 10W under standby;
(6) Advanced brushless motor(36V,100W) can automatically adopt different heavy door leaves;
(7) Bi-doors inter-locking: one of the door leaves always remains closing;
(8)Safety sensor terminal: sensor stops working when door closed;
(9)Unique coating technology: never rusty;
(10)Easy and convenient to install;
(11)Working Process: when the door leaf closes to the right place, the door leaf will slightly shift to the door frame and the ground. The rubbers on the four sides of the door leaf will completely combine with door frame and ground, which ensures air tightness. When the door is open, the rubbers will separate from door frame and ground, which avoids contraction on the ground.
Technical Specification
Specification |
Light Duty |
Heavy Duty |
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Rang of the Door |
Single-Leaf |
Double-Leaf |
Single-Leaf |
Double-Leaf |
Door leaf max weight |
100kg |
100kg x 2 |
200kg |
200kg x 2 |
Mounting Method |
Surface mounting or built-in mounting |
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Open Width |
700-2000mm |
650-2000mm |
750-2000mm |
650-2000mm |
Power Supply |
AC 220v ± 10%, 50-60 Hz |
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Opening Speed |
300-500mm/s (adjustable) |
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Closing Speed |
250-550mm/s (adjustable) |
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Creep speed |
30-100mm/s (adjustable) |
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Hold-open time |
0.5-20s (adjustable) |
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Airproof Force (Max.) |
>70N |
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Manual Pushing Force |
<100N |
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Electronic Lock Force |
>800N |
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Power consumption |
150W |
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Ambient temperature |
-20+50 C |
Technical Details:
(1) Rubber lining sealing technology combined with V groove on the guide rail enables the door completely sealed when the door closed;
(2)Special door body location technology. Semicircular surface beam on the ground matches with the V style groove at the bottom of door leaf, which stop the door from swing and make sure it moves stable and smooth;
(3) The door body decorated with matte stainless steel or spray surface, and on the middle and both sides with sealing stripes to ensure the hermetic effect.
(4)Feet sensor switch applied to avoid contagion;
Stainless Steel Sliding Door,Stainless Steel Bypass Sliding Door,Stainless Steel Interior Sliding Door,Stainless Steel Folding Sliding Door
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hongfadoor.com