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GSP301 1-Axis Digital Magnetic Field Transmitter


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 Coliy Gaussmeter Model List
Model Sensor Type Axis Accuracy
Based on reading
Gaussmeters for High Magnetic Field(0-10T)
G91 Hall Handheld 1 2.0% 2T 10μT
G92 Hall Handheld 1 1.0% 10T 10μT
(with probe Y08P150G93)
Hall Handheld 3 1.0% 3T 1μT
G201 Hall Desktop 1 0.25% 10T 1μT
G203 Hall Desktop 3 0.25% 3T 1μT
G401* Hall Desktop 1 0.05% 10T 0.1μT
G403* Hall Desktop 3 0.05% 3T 0.1μT
G501* Hall Desktop 1 0.01% 3T 0.1μT
GSP301 Hall Digital Transmitter 1 1%, 0.5%, 0.25%,0.05%* 10T 0.1μT
GSP303 Hall Digital Transmitter 3 1%, 0.5%, 0.25%*,0.05%* 3T 0.1μT
Gaussmeters for Low Magnetic Field(0- 4.5mT)
GMR50 GMR Handheld 1 1.0% 4.5mT 10nT
(with probe Y08L150G93)
GMR Handheld 3 1.0% 1mT 10nT
GF601 Fluxgate Handheld 1 0.5% 1mT 1nT
GF603 Fluxgate Handheld 3 0.5% 1mT 1nT
GF803* Fluxgate Desktop 3 0.1% 1mT 0.1nT
GFP703 Fluxgate Digital Transmitter 3 0.5% 1mT 1nT
GFP903* Fluxgate Digital Transmitter 3 0.1% 1mT 0.1nT
Magnetic Field Measurement System
GAS3000 Probe Array of Magnetic Field Detection System:
can be used to simultaneously monitor 2- 128 points of magnetic field
Gaussmeter Calibration System DC Magnetic Field
(Accuracy up to 50ppm)
AC Magnetic Field
(Accuracy up to 0.1%)
·Low Range: 0.1nT- 0.1mT
·Middle Range: 0.1- 100mT
·High Range: 1mT- 2T
·Low Range: 0.1μT- 0.1mT
·Middle Range: 0.01- 15mT
·High Range: 0.1- 200mT
AC Magnetic Field Sensor
AMS-2K Range of 3mT; Frequency response 25Hz- 2kHz
AMS-1M Range of 3mT; Frequency response 2kHz- 1MHz
Note: 1T= 10KG; 1mT= 10G;  1μT= 10mG;  1nT= 10μG;    
 “*”: coming soon without notice.

 GSP301 1-Axis Digital Magnetic Field Transmitter 

With industry standard design, the latest electronic technology and high-strength sealed aluminum alloy enclosure, 1-Axis Digital Magnetic Field Transmitter GSP301, made by COLIY, has become so stable and reliable that can be connected with a computer, controller, PLC, DCS and display instruments. Meanwhile, 1-Axis Digital Magnetic Field Transmitter GSP301 is easy to install, easy to make into an integrated system, and able to meet the industrial production of a variety of complex environments and requirements.

1-Axis Digital Magnetic Field Transmitter GSP301 could make magnetic field intensity  directly converted into 2-channel digital signals (RS485 and USB) and one analog signal (±3V or ±10V). Typical applications are that mapping magnetic field, magnetizing effect determination, residual magnetism testing, quality control and monitoring systems(generators, motors), laboratories and so on.

Digital Magnetic Field Transmitter GSP301’s power supply is very unique, as 5VDC- 36VDC wide power supply. Lack of power supply or power supply equipment failure situation will lead to voltage instability, and will be likely to cause instability in the test data or hardware damage. Wide voltage power supply, effectively ensures that GSP301 will work stably and has better reliability when power supply voltage is unstable.

Digital Magnetic Field Transmitter GSP301 allows measurements up to 100KG (10T) with the reading-based accuracy of 1% (accuracy of 0.5%, 0.25% and 0.05% also can be chosen), the resolution of 0.1G(0.01mT), and the frequency response of DC~ 20KHz.

Digital Magnetic Field Transmitter GSP301’s typical probes adopt the instrument-grade GaAs Hall Sensor which owns a temperature coefficient of 300ppm/℃, and without Temperature Sensor. However, Temperature sensor-contained probes(probes with built-in temperature sensor) have the function of temperature compensation, so temperature sensor-contained probes are strongly recommended for better precision and stability when the temperature changes, and it’s suitable for institutes, universities and enterprises. Therefore Transmitter GSP301 can be equipped with different kinds of 1-Axis Probes: Standard Probe, High-range Probe (10T), High Temp. Probe(up to 160℃), and Temperature sensor-contained Probe. Also according to the special needs of customers, it’s possible to customize probe’s range, shape and size. Meanwhile, 1-Axis Digital Magnetic Field Transmitter GSP301 has passed the CE certification and EMC (Electromagnetic Compatibility) test.
 • Manufactured by industry standards
 • Cost-effective
 • High reliability and stability
 • High-strength sealed aluminum alloy
 • Power supply voltage 5VDC- 36VDC
 • Digital signals(RS485 and USB) output
 • Analog signal(±3V or ±10V) output
 • Through EMC test
 • Certified by CE Standard
 • Instrument-grade GaAs Hall Sensor 
 • Accuracy of 1%, 0.5%, 0.25%, or 0.05%
 • Range of 30KG(3T) or 100KG(10T)
 • Frequency response DC- 20KHz
 • High Temp. Probe(up to 160℃) available
 • High-range Probe(10T) available
 • Temperature sensor-contained Probe: 
   Temperature compensation
 • Explosion - proof model available
 • Probe can be customized


GSP301 Digital Magnetic Field Transmitter Specification:

Measurement Specification
Accuracy(DC) ±1% of reading ± 100ppm of Range
±0.5% of reading ± 80ppm of Range
±0.25% of reading ± 50ppm of Range
±0.05% of reading ± 20ppm of Range*   
  (* : will come soon in future without notice)
Range 30KG(3T)  OR  100G(10T) 
Best Resolution 0.1G(0.01mT)    [DC accuracy of ±1% or ±0.5%]
0.01G(1μT)      [DC accuracy of ±0.25%]
0.001G(0.1μT)   [DC accuracy of ±0.05% ]
Frequency Response DC - 20KHz
Temperature Coefficient <±300ppm/℃   [Typical Probe]
<±80ppm/℃    [Temperature Sensor-contained Probe] 
Zero Drift <±0.3G/ 168 hours
Long-term Instability of Sensitivity <0.1% over 1 year
Minimum Magnitudes
 for Rated AC Accuracy
3% of Range
Probes Standard Probe, High-range Probe (10T), High Temp. Probe(up to 160℃),
 and Temperature sensor-contained Probe; 
Digital Output
Function To connect with a computer, controller, PLC, DCS and display
 instruments for digital signal output
USB Interface Cable: MAX. 2m; Data update rate: MAX. 30 Sample/s
RS485 Interface Cable: MAX. 500m; Data update rate: MAX. 30 Sample/s
Analog Output
Function Real-time analog voltages output: these are high-level differential voltages
 in proportion to the magnetic flux density
Range ±3V    [When Transmitter’s DC Accuracy is 1%, 0.5%, or 0.25%]
±10 V  [When Transmitter’s DC Accuracy is 0.05%]
Proportion 3V(or 10V) proportional with the selected measurement range 
(Note: Magnetic field measurement range can be arbitrarily set(selected)
 by software, in proportion to analog output voltage. For example, 
measurement range is set as 2500G)
Frequency Response DC to 20KHz
Output Resistance < 100 Ω (short circuit protected)
SMART PC Software
Function 1, Automatically record and display trend graph; 
2, Display magnetic flux density, maximum and minimum in real time; 
3, Choose DC Measurement Mode or AC Measurement Mode;
4, Arbitrarily set(select) the measurement range that is proportional
 to analog output voltage, etc.
Transmitter Specification
Working Temperature -20°C  to  +60°C
Storage Temperature -20°C  to  +75°C
Power Consumption (MAX)1.2W
Power Supply 5VDC- 36VDC
Dimension 165 mm W × 95 mm H × 40 mm D
Weight 300g
Certification CE Certification, EMC Certification
GSP301 Transmitter’s Dimension and Terminals Description

1, Transmitter Terminals Description
Terminals Description
B Digital Signal Output(RS485)
[Cable Length: max. 500m]
OUT Analog Signal Output 
(±3V or ±10V)
D- Digital Signal Output(USB)
[Cable Length: max. 2m]
(DC-IN)+ DC Power Supply
(5VDC- 36VDC)

2, Probe’s Dimension
Probe Specification
Probe Type and Specification See in Description Of Transmitter Type Selection
Probe Dimension 20 x 4.5 x 1mm
Probe cable length See in Description Of Transmitter Type Selection
The position of sensor center  When DC Accuracy is 1% or 0.5%, 
  for Copper Probe: D=1mm ± 0.2mm;
  and for Plastic Probe: D=2mm ± 0.2mm;
When DC Accuracy is 0.25% or 0.05%, D=3mm ± 0.2mm
Description Of Transmitter Type Selection
Range  Accuracy
on reading)
High Temp.
 Probe (up to
Temp. compensation
 proof model
(“*” : will come
 soon in future)
GSP301 3T 0.5% 2m H TC  
     Example of 1-Axis Digital Magnetic Field Transmitter: GSP301-3T-0.5%-2m-H-TC 
1.The digital output accuracy is based on reading, and not affected by Range;
2.Magnetic field measurement range, which is proportional to analog output voltage, can be arbitrarily set by software;
3.Temperature sensor contained Probe, has the function of temperature compensation, and the temperature coefficient is <±80ppm/℃;
4.Each probe’s fully calibrated measurement range: ≤±20KG(±2T);
5.Frequency Response: DC to 20KHz;
6.All 1-Axis Digital Magnetic Field Transmitters have 2-channel digital signals (RS485 and USB) outputs and one analog signal (±3V or ±10V) output. 

Optional Accessories
Model Descriptions
PS2012 Power Adapter; Input: 100VDC- 230VDC; Output: 12VDC, 2A
ZC10 Zero chamber, provides up to 80 dB attenuation in fields up to 500 G and can be used with standard probes. Internal dimension of the Chamber: diameter 6.8mm x 44.5mm
S485USB RS485 to USB adapter
PUSB USB port connector
The most popular Package
ORDER GSP30101: Transmitter GSP301-3T-1%-2m-TC + Zero Chamber ZC10 
Precision Description Of COLIY Transmitter

When using Transmitter to measure magnetic field in the environment that ambient temperature changes obviously, it’s recommended to use temperature sensor- contained probe with the Transmitter. Temperature sensor-contained probe has the function of temperature compensation for better precision and stability when the temperature changes.
• When the magnetic field is within 30KG(3T), users could directly choose the accuracy grade according to users’ desired accuracy. For example, users use transmitter, whose accuracy is 1%, to detect a magnetic field at about 1000G. Then transmitter’s reading range is 1000G ± 1000G * 1%, instead of 1000G ± 30000G * 1%, for COLIY transmitter’s accuracy is based on reading rather than transmitter’s range. (30000G is the transmitter’s range, 30000G= 3T)

Compare With Competitors
an advantage
1-Axis Digital Magnetic Field Transmitter GSP301
1-Axis Magnetic Field 
Transducer F1A
Accuracy* Based on reading Based on range
Temperature Coefficient <±80ppm/℃
(Probe with built-in temperature sensor)
Power Supply  One channel, 5VDC- 36VDC Two channels, ±12VDC
Analog Output ±3V or ±10V ±10V
Digital Signal Output(USB) YES NO
Digital Signal Output(RS485) YES NO
* : Accuracy could be customized.

Service commitment

1. Quick-shipment

Equipment in stock will be shipped out in 5 work days after payment effected.

2. 30 Days Full-refund Guarantee

Unconditional refund in 30 days after the shipment date.(Buyer pays return shipping)

3. 12 Months Warranty

Warranty service period up to 12 months since the shipment

4. OEM & ODM

Best qualiy product with your own brand: we can design for you, manufacture for you!


BANKValartis Bank (Liechtenstein) AG
BANK ADDRESS: Schaaner Strasse 27, 9487 Gamprin-Bendern, Liechtenstein 
ACCOUNT NAMEColiy Asia Limited
IBAN USD accountLI92 0880 3103 4361 0000 0
IBAN EUR accountLI65 0880 3103 4361 0000 1

Delivery2-4 weeks

How to place the order: 
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