G4AD3 OPTO 22, G4AD3 Datasheet - Page 2

• Manufacturer Part Number: G4AD3
• Description: I/O Module
• Manufacturer: OPTO 22
• Type: Inputr

Specifications of G4AD3

• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• Signal Input Type: 4 To 20mA
• No. Of Outputs: 1
• Resolution: 12 Bits
• No. Of Analog Inputs: 1
• No. Of Digital Outputs: 1
• Brand/series: G4 Series
• Connection To Host: Backplane
• Input: 4 to 20 mA
• Input Type: Analog
• Input, Range: 4 to 20 mA
• Mounting Type: PCB
• Number Of Channels: 1
• Primary Type: Data Acquisition
• Special Features: Transformer Isolation, Optical Isolation
• Voltage, Isolation: 4000 VAC
• Voltage, Supply: 28 VDC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

DATA SHEET
Form 426-050809
G4AD3 Specifications
formula:
ohm-meters typically supply only 1 volt excitation which is not sufficient to cause current to flow through the 3.3V zener diode. Therefore,
the ohm-meter will display infinite impedance (i.e. Mega-ohms, or an open circuit).
(20mA). This may be the case in applications using intrinsic safety barriers. An alternate approach is to use the 0 to 5 volt G4AD6 (or
G4AD6HS) with a 250 Ω precision resistor (Dale type RN is recommended) across the input terminals. This will provide a 1 volt input at
4mA and a 5 volt input at 20mA.
Specifications
Nominal input range
Module Input Impedance*
Over/under range
Loop supply
Accuracy**
Response time
Resolution
Isolation (Transient)
Input-to-output
Input-to-analog supply
Ambient temperature
Operating
Storage
* This is the equivalent impedance for the G4AD3 at full scale (20mA). The equivalent impedance is calculated by using the following
The module has an internal resistance of 249 Ω in series with a 3.3V zener diode.
It is not possible to use an ohm-meter to accurately measure the impedance across the field terminals of the G4AD3. This is because
In certain applications the total loop impedance may exceed the maximum impedance that the loop transmitter can drive to full scale
** Accuracy figure requires use of gain and offset commands.
Equivalent impedance = 249 Ω + 3.3V/0.02A = 414 Ω
16 µA**
12 bits
3 to 35 mA
28 VDC nominal
Full-scale step change in 3 ms
4 to 20 mA
414 Ω∗
4,000 V
4,000 V
-30° C to 70° C
-40° C to 85° C
rms
rms
I/O MODULES
ANALOG INPUT
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G4