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DA7 HART Distributor
Brand: Yokogawa
The DA7 is a nest-mounting type DCS-supported distributor, is used in combination with a two-wire transmitter, and converts 4 to 20 mA DC signals into isolated 4 to 20 mA DC signals.
Features- Bi-directional relay of HART communication signals is possible while the field devices and the DCS are isolated from each other
Specifications
Brand
Accuracy
- ± 0.1% of Span - for Output 1
- Relative Error between Output 1 & 2 is within ± 0.2% - for Output 2
Communication
- HART Communication (Output 1 Signal Only)
Consumption
- 100 mA at 24 Vdc - Current Consumption
Electrical Connectors
- M4 Screw Terminal
Humidity
- 5 to 90% Relative Humidity, Non-Condensing
Input
- 40 mA DC - Maximum
Input Signal
- 4-20 mA DC - from 2-Wire Transmitter
Insulation Resistance
- 100 MegaOhms or more at 500 Vdc between Input & Output, Output & Power Supply, & Input & Power Supply
Mounting
- Nest-Mounting
Operating Temperature
- 0° to 50° C (32° to 122° F)
Output
- 1-5 Vdc - Output 2 Signal
- 4-20 mA DC - Output 1 Signal
Power Supply
- 24 Vdc ± 10% (Ripple Content 5% peak-to-peak or less)
- 25.25 ± 0.25 Vdc - Transmitter Power Supply
Power Supply Effect
- ± 0.1% of Span or less - Effect of Power Supply Voltage Fluctuations
Resistance
- 2 KiloOhms or more - Allowable Load Resistance Output 2 Signal
- 250 ohms Equivalent - Input Resistance
- 350 ohms or less - Allowable Load Resistance Output 1 Signal
Response Time
- 150 milliseconds, 63% Response (10 to 90%)
Span & Zero Adjustments
- -1 to 1% - Zero Adjustment
- 95 to 105% - Span Adjustment
Supply Voltage
- 1,500 Vac/minute - withstand Voltage between Input & (Output & Power Supply)
- 500 Vac/minute - withstand Voltage between Output & Power Supply
Temperature Effect
- ± 0.2% of Span or less for a Temperature Change of 10° C (18° F) - Effect of Ambient Temperature
Voltage Drop
- 5 V or less at 20 mA Input
