Cheemi Technology Co., Ltd Tel: 025-85996365 E-mail: [email protected]www. cheemi-tech.com Cheemi is specialized in development and commercialization of monitoring & measuring solution innovation, with more than 100 workers, 5200 ㎡ non-dust workshop, 12 years experience in current measurement, ISO, CE & RoSH certificated, one and half hours reach Shanghai port. This is how we keep good quality and competitive prices for global valued customers. Cheemi provides the most effective and reliable sensor solutions which involve Open & Closed Loop Hall Effect Current & Voltage Sensors, Current Transmitter, Leakage Transducer; completely replace LEM hall sensors with excellent quality and performance. Hall Proximity Sensors, Inductive sensors, Photoelectric Proximity Sensors; Equivalent to OMRON Proximity Sensors. Temperature sensors: PT100 series sensor, Temperature Transmitter, Thermocouples/RTD Current Transformers and Potential Transformers For more information, please visit our website: www.cheemi-tech.com
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Cheemi is specialized in development and commercialization of monitoring & measuring solutioninnovation, with more than 100 workers, 5200 ㎡ non-dust workshop, 12 years experience incurrent measurement, ISO, CE & RoSH certificated, one and half hours reach Shanghai port. This ishow we keep good quality and competitive prices for global valued customers.
Cheemi provides the most effective and reliable sensor solutions which involve
Open & Closed Loop Hall Effect Current & Voltage Sensors, Current Transmitter, LeakageTransducer; completely replace LEM hall sensors with excellent quality and performance.
Hall Proximity Sensors, Inductive sensors, Photoelectric Proximity Sensors;Equivalent to OMRON Proximity Sensors.
Temperature sensors: PT100 series sensor, Temperature Transmitter, Thermocouples/RTD
Current Transformers and Potential Transformers
For more information, please visit our website: www.cheemi-tech.com
1.Open Loop Hall Effect Current SensorPrincipleHall Effect Open Loop Current Sensor is a current measurement device which develops on base of the hall effectprinciple, wherein a Hall-effect device(HED) produces an output voltage linearlyrelated to the amplitude and phase of amagnetic field applied to it.
AdvantagesEasy installation
Can be customized
No insertion losses
Low power consumption
Wide current measuring range
High immunity to external interference
2.Closed Loop Hall Effect Current SensorPrincipleHall Effect Close Loop Current Sensor develops on the principles of the Magnetoresistive or Hall effects, and thenull balance or zero magnetic flux method.Primary current Ip provides the magnetic flux which will be balanced by a complementary flux produced by drivinga current through the secondary winding, so the positive and negative magnetic field reaches balance to detect thecurrent.In other words, the secondary current, IS,creates a flux equal in amplitude, but oppositein direction, to the flux created by the primarycurrent.This current can be expressed as avoltage by passing it through a resistor.
AdvantagesHigh accuracy
Very good linearity
Easy installation
Can be customized
Low temperature drift Optimized response time, no insertion losses
Low power consumption High immunity to external interference
3.Hall Effect Voltage SensorPrincipleThe principles of Hall Voltage Sensor is the same as the closed loop hall current sensor, but need to convert thevoltage of the primary terminal to current through the resistor R1.So the hall voltage sensor is also used to testcurrent signal, and the output compensation current/offset current can accurately reflect the changes of primaryvoltage signal. To select the right R1 value, please choose different sensors based on the test voltage and power.
AdvantagesHigh accuracyVery good linearityEasy installationCan be customizedLow temperature driftHigh immunity to external
interference
4.Current Transmitter/TransducerPrincipleCurrent transmitter is a current measurement device which develops on base of the hall effect principle. It canaccurately measure various types of DC, AC voltage, which is widely used in the electrical power supply,communication power and other fields.
AdvantagesEasy installationCan be customizedNo insertion lossesLow power consumptionWide current measuring rangeHigh immunity to external interference
5.DC Leakage Current TransducerPrincipleDC Leakage Current Sensor develops based on magnetic modulation closed loop principle, to measure tinycurrent (mA level). DC leakage current measuring range can reach 0~±200mA.
Proximity Sensor SeriesHall Proximity Sensor:H-JK/JB/JZ----C Series
Introduction Principle:H-JK series hall proximity switch is a new type of
automatic switching device based on the principle of hall effect. This product adopts the round tube shaped waterproof design, Application: It reaches IEC144 standard and widely used in
light industry, chemical industry, textile, printing, machinery,metallurgy, telecommunications, transportation, automaticcontrol, computer and other fields.
It is divided into three categories according to the workingstate :JK - normally open type,JB - normally closed type,JZ - self - lock type.
Features: High response frequency, strong anti-interference
ability High precision - repeat positioning. Multi-function for protection with working status
indicator. Can be directly interface with the programming
controller (PLC). High reliability, long lifespan.
1)The supporting magnet steel adopts the S surface of Φ8×4 Ndfeb magnets(surface magnetic induction intensity is0.3T) ;other magnet is also available, but the working distance will change.2) Series of JK/JB/JZ are using three-core sheath cable with length of 50cm. If there isn’t clear requirement for the outputpolarity,please refer to the way of NPN.3) Working Temperature(℃): Ⅰ: -40~+125; Ⅱ: -25~+85;4)Both the configuration parameters and the cable length can be customized.5)Please state the full part number on the order,such as JK8002CⅡ.
Inductive Proximity Sensor: LJK/LJB Series DC Cylinder-shaped Sensor
Introduction Principle: Inductive Proximity Switches are developed based
on a coil and high frequency oscillator that creates a field inthe close surroundings of the sensing surface. The presence ofmetal in the operating area causes a change in the oscillationamplitude. This change is identified by a threshold circuit,which changes the output of the sensor.
Standard Detected Object: Inductive proximity sensors detectthe presence, movement and position of metallic objects.
The operating distance of the sensor depends on the coil’s sizeas well as the target’s shape, size and material.
It is divided into two categories according to the workingstate :JK - normal open type,JB - normal closed type
Features: Contactless detection of metal objects, to avoid
damage to the sensor itself and the target. No contact output, high reliability, stable operation
and long service life High repeatability positioning accuracy and excellent
measurement accuracy Small sensor, flexible installation.
Case Type Model Supply Detection Standard Response Working Output Mode
Inductive Proximity Sensor: L-JK/JB Series DC Square-shaped Sensor
Case Type ModelSupply
Voltage (V)
DetectionDistance(mm)
StandardDetected
Object (Iron: mm)
ResponseFrequency(KHz)
WorkingTemperature
Output Mode
L-JK12M5N DC10-30 2/4 12*12*1 1 Ⅱ NPN/PNP
L-JK17M5N DC10-30 4/8 17*17*1 1 Ⅱ NPN/PNP
L-JK12D5L DC10-30 2/4 12*12*1 1 ⅡDC
two-wire
L-JK17D5L DC10-30 4/8 17*17*1 1 ⅡDC
two-wire
Structure parameterType Diagram(Unit:mm) Dimension A B C D
Sensors notembedded in metal
12*12*45
M12 M12×1 35 57 6
M18 M18×1 45 72 10
Connection
NPN
PNP
DC Two-wire
Remarks:1)Inductive proximity sensors detect the metallic objects,2)The detection distance may fluctuate with the differentmaterials of the detected target.6)Both the configuration parameters and the cable length can becustomized. Standard cable length 1.5M.7)If no explicit requirement for the output polarity, theproximity sensor will be supplied based on NPN mode.6 ) Please state the full part number on the order, such asLJK-A4GⅢ or L-JK12M5NⅡ.
Magnetic Proximity Sensor/SwitchMJK/MJB/MJKB Series
Introduction Principle: Magnetic switch is also called the magnetron,
which is a switching element controlled by the magneticfield signal. Disconnect once non-magnetic.
Magnetic switches are used to detect circuit or the state ofmechanical movement and widely applied in Security Door,household doors, printers, fax machines, telephones andother electronic equipment.
Working state :MJK - Normal Open type,MJB - Normal Close type,SPDT MJKB type.
Features: Small size, light weight, easy installation Good insulation performance, suitable for all kinds
of complex environment Long life-span, high reliability and high stability. Customized service available
Case Type ModelSupplyVoltage(DC:V)
Max. PowerMax.Power
Max.SwitchingCurrent
Min.BreakdownVoltage
Max.LoadCurrent
M6
MJK/B/KB-
DC5-24V
10W DC100V 0.5A DC200V 1.0A
M8
DC5-24V
10W DC100V 0.5A DC200V 1.0A
M10
DC5-24V
10W DC100V 0.5A DC200V 1.0A
M12
DC5-24V
10W DC100V 0.5A DC200V 1.0A
M18
DC5-24V
10W DC100V 0.5A DC200V 1.0A
MJK/B/KB-23DC5-24
V10W DC100V 0.5A DC220V 1.0A
MJK/B/KB-30DC5-24
V10W DC100V 0.5A DC220V 1.0A
MJK/B/KB-48DC5-24
V10W DC100V 0.5A DC220V 1.0A
1) Series of MJK, MJB are using two-core sheath cable, MJKB series apply three-core sheath cable with length of 50cm. Ifthere isn’t clear requirement for the output polarity,please refer to the way of NPN.
4)Both the configuration parameters and the cable length can be customized.5)Please state the full part number on the order,such as MJK-M6.
Temperature Sensors
PT100 series RTD Temperature SensorIntroduction Principle: PT100 series thermal resistance
temperature sensor develops based on the principlethat RTD changes with temperature, and presenting acertain functional relation.
Application: Usually PT100 series RTD TemperatureSensors are matched with temperature transmitter,display instrument and computer to directly measurethe temperature of liquid, gas and solid surfaceranging from -200℃~500℃ during the productionprocess.
Features: Anti vibration, good stability, high accuracy High anti-pressure ability Graduation: PT100、PT1000 optional Explosion-proof grade: ExiaⅡCT4(intrinsic safety type)
SBWR/Z Series Temperature Transmitter is used withIndustrial thermocouple and RTD.
It applies two-wire transmission mode (two wires as thecommon transmission line of power input and signal output )to convert thermocouple and RTD signals into output signal4~20mA.
The series products has been widely used in industrialcontrol field.
Features: Can be directly installed in the sensor terminal box Accurate signal can be transmitted far way(Max
1000M) High long-term stability, maintenance-free
Case Type Model Input SignalMeasuring
Range(℃)Tolerance
MeasuringRange(V)
Output ModeOutputLoad(Ω)
SBWZThermocoupleK E J B S T NRTD: PT20PT100 PT500
PT1000
-200~1800
0.2%FS
DC24±10% 4~20mA
250
SBWR 0.2%FS 250
Thermocouple/RTD
Introduction
Thermocouple/RTD is usually used with display instrument,recording instrument and computer to directly measure thetemperature of liquid, gas and solid surface ranging from 0℃~
1800℃ during the production process.
Features: Simple matching for easy replacement Pressure spring type temperature sensing element,
high anti-vibration performance Wide measuring range High mechanical strength, excellent pressure
Ultra-micro Current TransformerIntroduction: Current Transformer is also called instrument transformer, including current
transformer and voltage transformer. It is used to proportionally convert high voltage or large current into standard voltage
(100V) or standard small current (5A or 1A, rated value), to realize the miniaturizationand standardization of the measuring instrument, equipment protection and automaticcontrol equipment.
Current transformer can also be used to separate the high voltage system to ensure thesafety of the personal and equipment.
Features:● Small size● High accuracy● Good consistency.● Used for current and powermeasurement