Sensor Circuit

Grain and cotton warehouse exaggerated humidity automatic ventilating and language admonishment circuit

Published:2011/4/27 9:16:00 Author:Nicole | Keyword: grain warehouse, cotton warehouse, automatic ventilating, language admonishment

The circuit is as shown, it is composed of humidity sensitivity electric bridge network, comparison circuit, relay control ventilating circuit, language phonation circuit and AC depressurization rectifier circuit . When the warehouse hunidity is exaggerated, the circuit will automatically connect to ventilating fan, and send out admonishment language, to remind the personnel on duty of taking a note. RH is humidity sensor,a bridge testing humidity network is composed of RH, RP1, R1, R2. When the environmental humidity is within the normal range, sensor RH has a large resistance.   (View)

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ZD—30C and ZD-30D automatic gravimetric filling instrument photo-sensitive circuit

Published:2011/5/2 7:17:00 Author:Nicole | Keyword: automatic gravimetric filling instrument, photo-sensitive

When it is low brightness, the current is small, 3DG6 turns off, 3DG12 turns off, relay has no action. When it has light, 3DG6 turns on, 3DG12 turns on, relay pulls up. The baiting gate is controlled by relay, it can accomplish the aim of baiting as the desired value. 2CP12 is used to prevent the Back EMF released by relay. This automatic gravimetric filling instrument can set value with 0.5kg graduation discretionarily in the range of 0~30kg, the precision can reach millesimal.   (View)

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Simple pressure sensor amplification circuit diagram

Published:2011/5/2 7:06:00 Author:Nicole | Keyword: pressure sensor, amplifition

The figure 1 is a simple pressure sensor amplification circuit. Preamplifier A1 adopts 200 times fixed gain pressure sensor special preamplifier U2O. When it is standard load, you can use four and a half digital voltmeter to ontain data, the sensitivity is 2mV/V.   (View)

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Temperature Sensor of Current Transmission Circuit

Published:2011/5/1 22:30:00 Author:Felicity | Keyword: Temperature Sensor of Current Transmission Circuit,

The resistance in the cirtuit is metal film one. Itsaccuracy is better than 1% and temperature coefficient TCis less than ±50X10-6/K.The measuring range is from0℃ to 100℃. Current I= 4+T/6.25. The temperate unit is ℃ and the current unit is mA. The current shows KTY87two-wire current transmitter consisting of Wheatstone bridge with pre-amplifier , current transmitter stage and voltage regulator.   (View)

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Infrared Detection Electric Shock Protection And Warning Circuit

Published:2011/5/2 4:11:00 Author:Robert | Keyword: Infrared Detection, Electric Shock Protection And Warning

Infrared Detection Electric Shock Protection And Warning Circuit is shown below:   (View)

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Centigrade thermometre circuit

Published:2011/4/28 21:59:00 Author:Nicole | Keyword: centigrade thermometre

SL134 is three terminal type IC, it is used as temperature sensor. The measuring range is -55~+125℃, its exterior has two kinds: metal package and plastic package. The work voltage range of V+~V- is V±=0.9~30.0V, the current I+=Is+I-, Is=0.01~5.00mA, I+/I-=14~26, the maximum allowable value between R-V is 5V, the maximum allowable power consumption PD=200mW. Under the normal situation, the R-V voltage value temperature factor is about +227μV/K. In this circuit, Ci is used to prevent SL134 self-excited, C2 and C3 are used to 5GOP-07 power supply decoupling, 5G1403 is as the core to form 5GM14433 three and a half digital display voltmeter. To change R3 or R6 then Vx will change in relation to the temperature with the proportion of 10mV/℃, to change Q1 can make Vx=0V when T=0℃.   (View)

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XTR101 Thermocouple Input Circuit

Published:2011/4/26 8:05:00 Author:Robert | Keyword: Thermocouple

The circuit shows the thermocouple input circuit withtwo temperature zones and diode cold junction compensation. This circuit uses J-type thermocouple as temperature sensor, semiconductor diode Das cold junction temperature compensation to form the relative 0oC of the measurement, to measure the temperature, T1 temperature range is from 0 to 1000oC. The temperature of T2 is equal to the temperature TD of semiconductor diode D. When the measured temperature changes in the range of 0to 1000oC, J-type thermocouple will have a 58mV change. When the ambient temperature is +25oC, the typical value would be 1.28mV. Corresponding 0oC transmission current is 4mA, corresponding 1000oC transmission current is 20mA.   (View)

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Pressure sensor excitation circuitry diagram

Published:2011/4/26 2:50:00 Author:Nicole | Keyword: pressure sensor

The figure 1 is a pressure sensor excitation circuit. Figure1(a) is generic constant voltage excitation circuit, it is composed of Zener diode VD1, operational amplifier and LM741; Figure1(b) is constant current excitation circuit, its stability is decided by Rl一R4, so it should choose the resistance with low temperature coefficient. The temperature stability of this excitation circuit should be designed to 1/100 of sensor. Such as the temperature stability of sensor is 0.1%, then the excitation circuit is 0.001%.   (View)

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Three phase SCR trigger

Published:2011/4/25 3:05:00 Author:Nicole | Keyword: three phase SCR, trigger

XMA5000 series regulator sends out three phase SCR trigger pulse instruction, and it emits six SCR phase shift trigger or zero-crossing trigger control singal, it is used to control the main loop SCR trigger conduction. It adopts unique trigger control circuit, it can trigger 3A~1000A unidirectional or bidirectional SCR.   (View)

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Multi-Channel Pressure Detection Apparatus Circuit Schematic Diagram

Published:2011/4/23 3:16:00 Author:Robert | Keyword: Multi-Channel, Pressure, Detection Apparatus

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Blind Pathfinder Circuit

Published:2011/4/23 8:53:00 Author:Robert | Keyword: Blind Pathfinder

Blind Pathfinder Circuit is shown below:   (View)

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Storehouse humidity detection and automatic ventilating air exhausting device circuit(MS01-A)

Published:2011/4/20 20:54:00 Author:Nicole | Keyword: storehouse, humidity detection, automatic ventilating, air exhausting device

The circuit is as shown, it is composed of precise time base oscillator, D trigger, temperature detection circuit, comparison circuit, relay control ventilating circuit, language admonishment circuit and AC depressurization rectifier circuit. BC adopts the crystal in silica watch, its natural frequency is 32768Hz; K1 adopts JZC-22F; C6, C7 adopt CD11-16V electrolytic capacitor; R10 adopts RJ-2W-820kΩ, RP1 adopts WH5 synthetic film potentiometer, the other resistances all adopt RT-1/8W carbon-film potentiometer; C8 uses CBB-400V-0.75μF; VC uses 1A/400V full bridge rectifier module or four 1N4004 to build a bridge rectifier; B uses 0.25W(8Ω) electricity-powered loudspeaker.   (View)

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valuables pilfering tracker circuit diagram 2

Published:2011/4/15 2:28:00 Author:Rebekka | Keyword: valuables pilfering tracker

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Limiting voltage trigger circuit diagram

Published:2011/4/15 2:30:00 Author:Nicole | Keyword: Limiting voltage, trigger

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The photosensitive control circuit applied in weaving machine triple run digital controller

Published:2011/4/8 2:47:00 Author:Nicole | Keyword: weaving machine, digital controller

When one of warps is broken, the baffle which is hold on to the warp will fall, and the light source of photosensitive tube 3DU21 is blockaded by the baffle. The relay releases, and to control the motor stopped.   (View)

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Orthogonal moving-magnet simulated watch movements drive circuit diagram

Published:2011/4/1 3:33:00 Author:Nicole | Keyword: simulated watch movements drive

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10-bit low-power digital temperature sensor application circuit

Published:2011/3/23 3:04:00 Author:Joan | Keyword: low-power , digital temperature sensor , application circuit

Below is 10-bit low-power digital temperature sensor application circuit.   (View)

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Infrared wireless alarm sensor circuit

Published:2011/3/21 1:28:00 Author:Joan | Keyword: Infrared sensor, wireless sensor, alarm sensor

Infrared wireless alarm sensor circuit.   (View)

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Infrared automatic faucet schematic

Published:2011/3/21 1:27:00 Author:Joan | Keyword: Infrared faucet, automatic faucet, automatic faucet

How it works:The circuit is shownas the figure. IC1 and W1, C1 and other components compose a 30 ~ 50KHz frequency pulse oscillator. It drives the infrared light-emitting diode D1 to send modulated infrared light. When someone close to the faucet for washing hands or hold water, a part of the the infrared ray emitted by the D1 which reflected back by the human body part is received by BG and then is amplified by op amp IC2 and then input to pin 3 of the audio decoder LM567. After decoding and dentifying it, the IC3 makes pin 8 output low. Relay J pulls in, normally open contact point JH connects to the solenoid valve power. Electromagnetic valve is opened, the faucet water automatically. When the human body leaves the faucet, BG lost infrared signal, then the circuit returns to the general state of waiting for work. Debug: Cover up D1 and BG by iron sheet. Tunning W1, W3 can make the infrared transmitter and receiver of the same frequency. When the human body is close to the faucet, the solenoid valve can reliably act. Regulating W2 resistance can change the D1 emission current, then the circuit can control the effective action distance when the human body close to the faucet(ie, sensitivity).   (View)

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Differential temperature measurement Circuit Diagram

Published:2011/3/21 0:52:00 Author:Joan | Keyword: temperature measurement, Differential temperature

The temperature difference between two points is often measured in many situations. For example, in water pump fan design and other designs, the impeller shape is always detemined by the temperature difference between the entrance and exit. if the difference is small, it requires high precision phase resolution. Figure 8 shows a high sensitivity temperature measurement circuit with 100mV / ℃ sensitivity. The precision op amp LM308 ouput 10 times of the differential temperature voltage the two temperature sensors measured. The Op amp output will be 0 by adjust the Rw when the two sensors are in the same temperature.   (View)

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