Martens MU125 - Temperature Measuring Transducer

Wide-range power supply
Supply voltage : 20..125VDC and
 20..250VAC (47..63Hz), max.1.5W
24V power supply
Supply voltage : 24V DC +/-15%, max. 1.5W
Combined data
Rated voltage : 253V AC
Test voltage : 3kV AC between
 supply // input = output
Working temperature : -10..60°C
Storage temperature : -20..80°C
Humidity : 10..90% (no condensation)
Measurement inputs
Pt100 : linearised,
 measuring current approx. 1.6mA
Pt1000 : linearised,
 measuring current approx. 130µA
 In the event of a sensor break or short
 circuit, the analog output drops to 0mA.
 The operation LED blinks red
Thermocouple : linearised with comparison position
 compensation
 (optionally without internal
 compensation)
NTC : linearised for B25/85=3977K or 3528K
 Max. load 200µW (averaged)
Linear resistance : Mb. 0..2kΩ: approx. 1.4mA
 Mbs. 0..5kΩ, 0..10kΩ: approx. 300µA
Zero point setting : +/-40% of the factory measuring range
 (= end value – start value)
 via 12-turn trim potentiometer
End value
reduction : -50% based on the factory end value
 via 12-turn trim potentiometer
 Note: The measuring accuracy drops
 proportionally with the narrowing of the
 measuring range
Potentiometer setting
limits : Limitation of the aforementioned
 adjustment ranges
Pt100 -50..500°C (..600°C)
Pt1000 -50..250°C (..300°C)
FeCuNi -100..500°C (..800°C)
NiCrNi -150..1250°C
PtRhPt 0..1500°C (..1600°C)
NTC (10kΩ) -20..100°C (..150°C)
NTC ( 2kΩ) -40..100°C (-50°C..150°C)
R linear 0..10kΩ
(values in parentheses apply for optional,
 customer-specific special measuring
 ranges that are configured at the factory)
Analog output : 4..20mA, max. burden 400Ω,
no galvanic isolation
from the input signal
(max. burden error of 0.2% at 400Ohm)
Dimensions (WxDxH): 12.5 x 114 x 108mm
Material : PA6.6, light grey,
Flammability class V0 (UL94)
Weight : 120g
Protection rating : IP20
Screw terminals : 0.2..2.5 mm², AWG 24..14,
 removable, coded
Push-in terminals : 0.5..1.5 mm², AWG 25..16,
(spring-type Double connection (12A between
terminals) the connections), removable, coded
Power Rail : 8A over the entire bus system
 (power supply via removable terminals
 0.2..2.5 mm², AWG 24..14)