MTL5582 RESISTANCE ISOLATOR to repeat RTD signals
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, non-configurable 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.
See also common specification
Number of channels
Location of RTD
Zone 0, IIC, T4 hazardous area
Div. 1, Group A, hazardous location
2-, 3-, or 4-wire* RTDs to BS 1904/DIN 43760 (100Ω at 0°C)
*user selectable by switches (factory set for 3-wire)
10Ω to 400Ω
RTD excitation current
2, 3 or 4 wires (independent of mode selected for hazardous area terminals)
10Ω to 400Ω (from a 100μA to 5mA source)
±10mΩ/C° typical (0.01%/°C @ 100Ω)
To within 4% of final value within 1s
Not suitable for multiplexed input cards
Safety drive on open-circuit sensor
Upscale to 420Ω nominal
<0.15Ω at excitation current 1 - 5mA
<0.25Ω at excitation current 0.5 - 1mA