MTL5576-RTD Temperature converter, RTD potentiometer input, 2-channel

 

The MTLx576–RTD converts signals from resistance temperature

detectors (RTDs) mounted in a hazardous area, into 4/20mA currents

for driving safe-area loads. Software selectable features include input

type and characterisation, ranging, monitoring, testing and tagging.

Configuration is carried out using a personal computer. The MTLx576–

RTD is compatible with 2– and 3–wire RTD inputs. The MTLx576-RTD

can also be configured to drive two safe-area loads from a single input.

 

SPECIFICATION

See also common specification

Number of channels

Two

Signal source

2-/3-wire RTDs to BS 60751

Pt 100, Pt 500, Pt 1000

Cu-50 & Cu-53

Ni 100/500/1000 DIN 43760

Location of signal source

Zone 0, IIC, T4–6 hazardous area

Division 1, Group A, hazardous location

Input signal range

0 to 400Ω (0 to 4000Ω Pt & Ni sensors)

Input signal span

10 to 400Ω (10 to 1000Ω Pt & Ni sensors)

RTD excitation current

200µA nominal

Common mode rejection

120dB for 240V at 50Hz or 60Hz

Series mode rejection

40dB for 50Hz or 60Hz

Calibration accuracy (at 20°C)

(includes hysteresis, non-linearity and repeatability)

Input: ± 80mΩ

Output: ± 16µA

Temperature drift (typical)

Input: ± 7mΩ/°C

Output: ± 0.6µA/°C

Example of calibration accuracy and temperature drift

(RTD input)

Span: 250Ω

Accuracy: ± (0.08/250 + 16/16000) x 100%

= 0.13% of span

Temperature drift: ± (0.007/250 x 16000 + 0.6) µA/°C

= ±1.0µA/°C

Safety drive on sensor failure

Upscale, downscale, or off

Output range

4 to 20mA nominal into 300Ω max.

Response time

Configurable - 500 ms default

(Accuracy at 100/200ms - contact MTL)

 

LED indicator

Green: power and status indication

Yellow: one provided for channel status

Red: alarm indication

Power requirement, Vs with 20mA signal

60mA at 24V

Power dissipation within unit with 20mA signal

1.4W at 24V

Isolation

Functional channel–channel isolation for safe and hazardous–area

circuits

Safety description

Refer to certificate for parameters. Um=253V rms or dc

Configurator

A personal computer running MTL PCS45 software with a

PCL45USB serial interface.




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