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TECHNICAL SPECIFICATION 
 

z

 

Input: 

 

Thermocouples: (with J1 module) 
K, S, R, E, J, T, B, N and WRe5-WRe26   

 

Two-wire RTDs: (with J2 module that supports 2 inputs) 
PT100, Cu50, 0~80 ohm, 0~400 ohm   

 

Three-wire RTDs: (with J0 module that supports 1 inputs) 
PT100, Cu50, 0~80 ohm, 0~400 ohm   

 

Linear mV voltages: (with J1 module) 
0~20mV, 0~60mV, 0~100mV, 0~1V   

 

Linear voltage: (with J3 module) 
0~1V, 0~3V, 0~5V, 1~5V etc.     

 

Linear current: (with J4 module) 
0~12mA, 0~20mA, 4~20mA etc.   

   

Extraction calculation input: (with J3 voltage and J4 current input module) 
1~5V, 4~20mA etc.   

 

Two-wire transmitter inputs: (with J5 module that provides 24VDC power supply) 
Connect to 4~20mA two wires transmitter   

 

z

 

Maximum lead wire resistance for RTD input: 

 

2-wire type RTDs:   
2 ohm for Pt100 or 0~400 ohm input ;1 ohm for Cu50 and 0-200 ohm input

 

 

3-wire type RTDs:   
5 ohm 

 

z

 

Measurement range

 

 
K(0~1300

), S(0~1700

), R(0~1700

), T(-200~+350

), E(0~1000

), 

J(0~1200

), B(0~1800

), N(0~1300

), WRe5-WRe26(0~2300

), 

Pt100(-200~+800

), Cu50(-50~+150

Linear input

-1999~+9999 set by user   

 

z

 

Measurement accuracy: 

 

±0.2%FS±1digit / ±0.3%FS±1digit (only for Cu50) 

 
Note 1:  For thermocouple inputs with internal cold junction compensation, 1

 CJC error 

should be taken into consideration.  For those with Cu resistor, ice point or 
thermostat bath compensation, the accuracy is as above. 

Note 2:   Accuracy is not guaranteed between 0 and 600

 for type B thermocouple input. 

 

Summary of Contents for AI-702M

Page 1: ...l Provide high accuracy compensation function such as ice point compensation copper resistance compensation and thermostat compensation to thermocouple inputs Provide accurate internal calculation fun...

Page 2: ...sion 96 96mm 2 thermocouple inputs 2 two wire RTD inputs 2 current inputs 4 alarm relay outputs RS485 communication interface and the supply power is 24VDC The explanation for each code is below Shows...

Page 3: ...nsient current G 1 SSR voltage output 12VDC 30mA G5 2 SSR voltage outputs 12VDC 30mA S Photoelectric isolated RS485 interface S4 Photoelectric isolated RS485 interface with isolated power supply X3 Ph...

Page 4: ...that provides 24VDC power supply Connect to 4 20mA two wires transmitter z Maximum lead wire resistance for RTD input 2 wire type RTDs 2 ohm for Pt100 or 0 400 ohm input 1 ohm for Cu50 and 0 200 ohm i...

Page 5: ...Response time 1 5 seconds if digital filter parameter is set as 0 or 1 z Automatic pilot time interval Approx 1 2s or 2s configurable z Alarm function High and low alarm configurable separately for e...

Page 6: ...on Two wire RTD wiring RTD can select two wire or three wire method by B of AF parameter Two wire method enable to input two channel signals in one module but user has to measure and calculate the res...

Page 7: ...ter Table The value of a parameter can be modified by or Press to go to next parameter Press and hold can return to the previous parameter Press can exit parameter setting status 3 Alarm display The l...

Page 8: ...means no communication and no alarm it can be treated as normal z The light flashing with period 0 6 second means no communication and general error occurs z The light quickly flashing with period 0...

Page 9: ...put spec 11 18 Spare 19 BA2 JPt100 20 Cu50 21 Pt100 22 Pt100 100 00 300 00 23 24 Spare 25 0 75mV 26 0 80ohm 27 0 400ohm 28 0 20mV 29 0 100mV 0 5V J3 0 20mA J4 30 0 60mV 31 0 1V 32 0 2 1V two wire re t...

Page 10: ...IL1 0 000 dIH1 1 000 9990 30000 units or 0 1 dIHx Scale high limit Scx Input offset For thermocouple or three wire RTD inputs the units of Sc is 0 1 For example when Sc 100 the actual offset 10 then t...

Page 11: ...nction selection AF is used to select advanced function The value of AF is calculated as below AF Ax1 Bx2 Cx4 Dx8 Ex16 A 0 Slow cyclic display A 1 Fast cyclic display Above setting only affects displa...

Page 12: ...ansmission current 0 220 Po Atmospheric pressure Defined atmospheric pressure when dry bulb wet bulb humidity measurement was activated Unit KPa 1 120 0 SPEd Wind speed Defined wind speed when dry bul...

Page 13: ...AL1 L AL1 etc Parameters from EP1 to EP12 can define 12 field parameters at most if the number of field parameters is less than 12 sometimes even none it is necessary to define field parameters from...

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