NHR-A34 Series Frequency input detection terminal isolator
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* Single channel input/ single channel output or daul channel output
* 12V/24V power voltage output (decided when ordered)
* Analog, RS485 and Switch signals output

1415954936304105.gif Summarization
   OHR-A34 Series powered 12V/24V for instruments in hazardous area with isolation. Frequency signals from instruments in hazardous area can be transferred to safe areas by safe isolator gate. It has a high anti-jamming ability. It needs powered separately with excellent isolation between power, inputs and outputs. It can be used together with devices outputting frequency signals.
1415954936304105.gif Security Certification
Certification No.CNEx16.0379
Explosion-proof mark[Exia Ga]IIC (Confirm to National Instrumentation Supervision, Inspection Station for Explosion-proof safety)
Authentication parameters 
TerminalsFrequency:10-1124V Power:10-12
Max allowable voltageUm=250VUm=250V
 VoltageUo=9.2VDCUo=28VDC
CurrentIo=23mAIo=93mA
PowerPo=53mWPo=0.65W
CapacitanceCo=3.1μFCo=0.05μF
InductanceLo=20mHLo=2.4mH
1415954936304105.gif Wiring diagram

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Terminals No.Terminals introduction

Safe areas

 (Green)

1Out1(mA+)/B
2Out1(-)/A
3Out1(V+)
4     Out2(mA+)
5Out2(-)
6Out2(V+)
7Pow(+)
8Pow(-)

Hazardous areas

(Blue)

10In(F-)
11In(F+)
12In(24V+)
1415954936304105.gif Structure diagram

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EVT: State indicator: green in normal state; red in the state of malfunction or alarm output;
35mm DIN installation. Make sure to install it stably, firmly and vertically for heat dissipation.
1415954936304105.gif Technology parameters
Power supply
Rated operating voltage rangeDC24V±10%
Power

Analog signals output: ≤1.7W(single-circuit),≤ 2.1W(dual-circuit)

Hazardous area
Types of inputFrequency signals (sine, rectangle, triangle wave)
Input impedance≤2M
Swing range0.2V~9V
Response time≤1S
Measure range1~10000Hz
Resolution0.1Hz
Distribution voltage/maximum current24V/30mA;12V/60mA  (Feeding power output: the wiring terminal 10 represents the positive anodes and 11 represents the negative anodes)  
Safe area
Type of outputAnalog signal output
Characteristics of output loadCurrent output: RL≤500Ω; Voltage output: Rl≥250KΩ
Measuring accuracy0.2% FS
Insulation strength
Fixed end and un-fixed end2500Vrms (1 min, without sparkle)
Environmental condition 
Operating temperature0~50℃(Without condensation or ice)
Relative humidity25%~85%RH
Storage temperature-10~60℃(Without condensation or ice)
Standard
Electromagnetism compatibilityConfirm to GB/T 18268 industry equipment applications requirements(IEC 61326-1)

1415954936304105.gif Instruments Selection

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Notes: If the instrument is with two output channels, there are three optional models:
       a. Analog quantity output + analog quantity output
       b. 485 output + analog quantity output
       c. Switching value output+ switching value output

       Model example: OHR-A34-Hz-0/0/V24(F/0~1000Hz)
       Frequency input detection terminal isolator, 4-20mA for both output channels with 24V power supply output, frequency input range 0~1000Hz.

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