Eaton MTL5582 Resistance Isolator

MTL5582
RESISTANCE ISOLATOR
to repeat RTD signals
The MTL5582 connects to a 2-, 3-, or 4-wire resistance temperature
device (RTD) or other resistance located in a hazardous area, isolates
it and repeats the resistance to a monitoring system in the safe area.
The module is intended typically (but not exclusively) for use with
Pt100 3-wire RTDs. Switches enable selection of 2-, 3-, or 4-wire RTD
connection. The MTL5582 should be considered as an alternative, nonconfigurable MTL5575, for use in RTD applications where a resistance
input is preferred or needed instead of 4/20mA. The design is notable
for its ease of use and repeatability. The number of wires which can
be connected on the safe-area side of the unit is independent of the
number of wires which can be connected on the hazardous-area side.
The module drives upscale in the case of open circuit detection. Note
that this module is not suitable for use with measurement systems
where the resistance input channels are multiplexed.
SPECIFICATION
See also common specification
Number of channels
One
Location of RTD
Zone 0, IIC, T4 hazardous area
Div. 1, Group A, hazardous location
Resistance source
2-, 3-, or 4-wire* RTDs to BS 1904/DIN 43760 (100Ω at 0°C)
*user selectable by switches (factory set for 3-wire)
Resistance range
10Ω to 400Ω
RTD excitation current
200μA nominal
Output configuration
2, 3 or 4 wires (independent of mode selected for hazardous area
terminals)
Output range
10Ω to 400Ω (from a 100μA to 5mA source)
Temperature drift
±10mΩ/C° typical (0.01%/°C @ 100Ω)
Response time
To within 4% of final value within 1s
Not suitable for muliplexed input cards
Safety drive on open-circuit sensor
Upscale to 420Ω nominal
Transfer accuracy@20°C
<0.15Ω at excitation current 1 – 5mA
<0.25Ω at excitation current 0.5 – 1mA