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RPM meter SZM-20

RPM meter SZM-20
Able to remotely measure the rotational speed of a variety of power equipment.
  • KDSI Also can do OEM

1.1Product Description  

SZM-20 magnetic tachometer is composed of two parts – an indicator and a sensor, which are connected together through a transmission cable without any external power supplied, able to remotely measure the rotational speed of a variety of power equipment.
Working Principle
The sensor is mainly composed of a permanent magnet and an induction coil. The permanent magnet is coupled with a power equipment item through a flexible shaft. When the permanent magnet is rotated by the power equipment, the induced current is generated in the coil, which then is transmitted to the indicator via the transmission cable. Such fluctuating current, after rectified with its voltage reduced, is used to drive the wide angle ammeter for indicating the measured rotational speed.
Technical Conditions
1.      Precision Grade:   1.5 (at 20±2°C)
2.      Working Environment:  Temperature range from -25°C to +55°C.
Relative Humidity 5% -100%, inclusive of frosting
3.       Humidity Added Error:  An additional error is less than 1.2% of the upper limit of  the measured value with every 10°C of temperature change.
4.       Measurement Range: (0-1500) r/min speed ratio1:1;
(0-2000) r/min speed ratio1:1;
(0-3000) r/min speed ratio1:2;
5.      Mechanical Force Tolerance: the meter can withstand the acceleration speed at 100m/S2 and 1000 continuous impacts of vibration in transport at the frequency 60100 times per minute.
Operating Instructions:
1.Time for use: Able to be operated continuously without lubricant oil added.
2.The sensor shall be used together with the indicator completing with it.
3.The resistance of the transmission cable shall not be greater than1.2 ohms, which are equivalent to the wire in the specification of RVV2*l6*0.15 used for a transmission distance of 10m. An additional 0.2% error will result for each 10m of distance if the said wire is used.
Sensor: 330g
Indicator: 590g
Installation Dimensions:
1.      Indicator
Profile dimensions: Ф108x85
Hole cutting size: Ф98
2.      Sensor
Please specify the model when ordering: SZM-20A, SZM-20B, SZM-20C, SZM-20D
Accompanying transmission cable:  1
Certificate of Conformity:  1
RPM meter the square.jpg

RPM meter the round.jpg
RPM meter the Column.jpg
RPM meter dimensioned drawing.jpg

1.2Product Application


1.3 Product Packaging 


          Both products for overseas and domestic sales have the same high quality and are same carefully packaged. Perfection is our best interpretation to professionalism.
       Anti-moisture, anti-extrusion, anti-shock and anti-exposure.
       Specially thickened quality packaging cartons, anti-moisture and anti-shock.

       Professional bubble bags inside to prevent vibration during transportation.

Our meters are carefully packed layer by layer to ensure they can withstand long-distance transit to arrive at customers 

1.4 Professional Storage

  Neat warehouse and clean production line

1.5 Our Customer

2.1、Test Report of SICEM  
No. Test Item Allowed value Actual value Conclusion
1 Appearanceinspection Visual control Meet the demand
2 Insulation resistance 5MΩ Meet the demand
3 Voltage test Voltage 2KV Meet the demand
4 Response time 4s 1.5s Meet the demand
5 Test of intrinsic error ±1.5 ±0.5 Meet the demand
6 Test of tracking error ±1.5 ±0.6 Meet the demand
7 Test of deviation from zero ±0.75 0 Meet the demand
8 Test of overshoot ±20 0 Meet the demand
9 Test of self-heating ±1.5 ±0.1 Meet the demand
10 Test of variation due to distortion of a.c. measured quantity ±1.5 ±0.2 Meet the demand
11 Test of variation due to position ±0.75 ±0.2 Meet the demand
12 Test of variation due to frequency on a.c. measured quantity ±1.5 ±0.3 Meet the demand
13 Test of variation due to a magnetic field of external origin ±6 ±0.2 Meet the demand
14 Test of variation due to ambient temperature ±1.5 ±0.2 Meet the demand
15 Test of variation due to ferromagnetic supports ±1.5 ±0.5 Meet the demand
16 Short-time overload test ±1.5 ±0.5 Meet the demand
17 Continuous overload test ±1.5 ±0.5 Meet the demand
18 Vibration and shock test ±1.5 ±0.3 Meet the demand
19 Temperature limits test ±1.5 ±0.2 Meet the demand
20 Test of variation due to temperature ±1.5 ±0.2 Meet the demand

 2.2、Advanced Test Equipment Imported

             Test is more accurate, with highest precision and smallest error

Our meters are carefully packed layer by layer to ensure they can withstand long-distance transit to arrive at customers safely. 

Production Line

Operators are working earnestly to control each and very working procedure. Details are attended as the manifestation of our professionalism everywhere 
Good products have been tried before you know, contact us immediately

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