MTL5532 Pulse Isolator MTL Instruments 4/20mA Current Outputs

MTL5532 MTL Instrument Pulse Isolator

The MTLx532 isolates pulses from a switch, proximity detector, current
pulse transmitter or voltage pulse transmitter located in a hazardous
area. It is ideal for applications involving high pulse rates and fast
response times, by repeating the pulses into the safe area. An analogue
output proportional to frequency is also provided, together with a relay
output, which may be configured to act as an alarm. Configuration is
carried out with a personal computer.

SPECIFICATION
See also common specification

• Number of channels
      One, fully floating
• Sensor type
     Switch or proximity detector (NAMUR/BS EN 60947–5–6:2001)
.2– or 3–wire voltage or pulse transmitter
• Location of switch
     Zone 0, IIC, T6 hazardous area
     Div. 1, Group A, hazardous location
• Location of proximity detector or transmitter
     Zone 0, IIC, T4–T6 if suitably certified
     Div.1, Group A, hazardous location
• Input
     Switch input:
     Output ON if switch is closed
     Proximity detector input:
     Excitation: 7.0 to 9.0V dc from 1kΩ nominal
     Output ON if input > 2.1mA* (< 2kΩ)
     Output OFF if input < 1.2mA* (> 10kΩ)
     Switching hysteresis: 0.2mA (650Ω) nominal
     *NAMUR and BS EN 60947–5–6:2001standards
     Current pulse input:
     Transmitter supply: 16.5V dc at 20mA
     Short circuit current: 24mA
     Output: Iin > 9.0mA = ON, Iin < 7.0mA = OFF
     Switching hysteresis: 0.5mA
     Voltage pulse input
     Input impedance: > 10kΩ
     Switching point voltage (Vsp): 3, 6, or 12V nominal
     (User selectable by switches on the side of the module)
     Output: Vin > Vsp = ON, Vin < Vsp = OFF
     Switching hysteresis: 100mV + (0.1 x Vsp) typical
• Safe-area pulse output
     Maximum delay: 10µs
     Maximum off–state voltage: 35V
     Maximum off–state leakage current: 10µA
     Maximum on–state resistance: 25Ω
     Maximum on–state current: 50mA
     Output OFF if supply fails
     Note: LFD signal is Zener-diode protected against inductive loads
• Safe-area current output
     Input capture delay: 2 signal periods (5ms min.)
     Signal range: 4 to 20mA
     Under/over range: 0 to 22mA
     Load resistance: 0 to 450Ω @20mA
     Output resistance: >1MΩ
     Ripple: < 50µA peak-to-peak
     Accuracy: better than 20µA at 20°C
     Temperature drift: < 1µA/°C
     Risetime (10% - 90%, after step change): 60 ms
• Alarm output
     Relay ON in alarm, 0.5A @ 35Vdc max.
• Pulse width
     High: 10µs min
     Low: 10µs min
• Frequency range
     0 – 50kHz - pulse output mode
     0 – 10KHz - for analogue output
• LED indicators
     Green: power indication
     Yellow: on when output circuit is on
     Red: flashing when line fault or error
• Power requirement
     65mA at 24V dc
     70mA at 20V dc
     55mA at 35V dc
• Power dissipation within unit
     1.35W maximum at 24V
     1.75W maximum at 35V
• Safety description (Um = 253V rms or dc)
     Terminals 2 to 1 and 6 to 1
     U_o=10.5V I_o=14mA P_o=37mW
     Terminals 4 to 3 and 1
     U_o=28V I_o=93mA P_o=651mW
     Terminals 3 to 1
     Non-energy-storing apparatus ≤1.5V, ≤0.1A and ≤25mW; can be
     connected without further certification into any IS loop with an open-circuit voltage <28V
     Terminals 5 to 4 and 1
     V_max ≤ 28V, I_max ≤ 94mA, P_max ≤ 0.66W
• Configurator
     A personal computer running MTL PCS45 software with a PCL45USB serial interface.

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