Standards Specifications (2)

Input isolator Input isolator card

Name                            card (1 to 5 V (with square root                 2-wire transmitter input card (*2)

input)               extraction)

Model                                   EH1                      EH5                      EA1              EA2                       EA5

Input signal                                             1 to 5 V DC          1 to 5 V DC                4 to 20 mA DC signal from 2-wire transmitter 

(Power can be fed transmitter)

Input resistance                                         1 MΩ (100 kΩ when power off)                                       250 Ω

External input resistance                                                –                                  RL= (20 – minimum transmitter operating voltage)

/0.02 Ω

Allowable input voltage                           _30 V DC              _9 V DC                           Allowable input current: 40 mA DC

Input linearization                                           –                   Square root                          –                     Square root extraction (*1)

extraction (*1)

Transmitter power supply                                               –                                       25 to 28 V DC                 25.0 to 25.5 V DC

(current limit: 25 to 35 mA)         (current limit: 25 to 35 mA)

Output signal                                                     1 to 5 V DC, 2 outputs (output resistance: 1 Ω max. load resistance: 2 kΩ min.)

Signal isolation                                                       Between input and output signals, input signal and power supply input

Mounting method                                                      Mounted in special nests (connected via backboard and connector)

Wiring                                                                      External wiring: Connect M4 screw terminals for I/O in the special nest

Connected I/O card: Special cable

External dimensions                                                                     73 (Width)x24 (Height)x115 (Depth) mm

Weight                                                                                                                       70 g

Accuracy rating (*3)                                                                                 Within _0.1 % of the span.  

However, accuracy under 2 % of EH5 and EA5 input must be in _1 % of the span.

Isolation resistance                                     Between input and output signals, input signal and power input: at 500 V DC,100 MΩ

Between output signal and power input: at 500 V DC, 100 MΩ

Withstanding voltage                                Between input and output signals, input signal and power input: 1500 V AC for 1 minute

Between output signal and power input: 500 V AC for 1 minute

Power supply                                                                                                    24 V DC _10 %

Maximum current consumption                 55 mA                   50 mA                   80 mA          100 mA                   80 mA

Ambient conditions                                                                     0 to 50 _C /5 to 95 % RH (non-condensing)

Effect of ambient temperature change                                           Max. _0.2 % of span for 10 _C change

Effect of power supply voltage change                               Max. _0.1 % of span for change of 24 V DC _10 %

*1:  Relationship between input and output is as follows:

=  2   X – 1  + 1 (V), where X is input and Y is output.

*2:  EA2 can be combined with intelligent transmitter BRAIN SERIES.

*3:  Accuracy rating of #2 output:  _0.2 % (deviation from #1 output).