MTT MS3773 Slim Plug-In Programmable Millivolt Isolator

The MTT MS3773 Slim Plug-In Programmable Millivolt Isolator takes a low-level DC millivolt signal from a sensor and converts it into a standard isolated current or voltage output, with the input range and output configuration set through PC software rather than fixed at the factory. This makes it a flexible replacement for a family of dedicated millivolt isolator models, since one MS3773 can be reconfigured for a different millivolt range or output type as project requirements change.

Configuration is carried out from a PC over an RS-232C connection, where the module can also be set up with a configurable 6th-order polynomial linearization to correct for non-linear sensor characteristics, going beyond simple straight-line scaling. Selectable burnout protection drives the output upscale or downscale if the input signal is lost, and an LED status indicator reports run, fail, and error states at a glance. Four-way isolation between input, output, and power keeps the converted signal protected from noise and ground loops.

Input Resistance1MΩ min.
Input Ranges20mV, 40mV, 80mV, 160mV, 320mV, 640mV, 1V, 2V
Allowable Input Voltage25V DC continuous
Burnout ProtectionSelectable upscale/downscale (approx. 55nA detection current); drive time 80s max (160s for 1V range, 480s for 2V range)
Output OptionsSingle: 4-20mA DC, 0-10V DC, 0-5V DC, 1-5V DC; Dual: 4-20mA/1-5V DC, 4-20mA/4-20mA DC, voltage combinations
Output Load2mA max (voltage); 750Ω max (single 4-20mA); 550Ω/350Ω (dual)
AdjustmentApprox. ±4% of span, zero and span, configured via RS-232C
Input Accuracy0.02% of range/span (excluding linearity error)
Output Accuracy±0.04% max
Temperature Effect100ppm/°C max
Response Time260ms max (0-90%, step input at 100%)
CMRR100dB min.
Isolation4-way isolation between input, output, power, and ground; 100MΩ min. insulation resistance @500V DC; 2000V AC dielectric strength for 1 minute
Power Supply100-240V AC, 24V DC, or 100-240V DC; 5.0VA max (single, AC) / 1.1-1.5W (24V DC) / 4.8-6.0W (100-240V DC); 160mA fuse standard
DimensionsW29 x H86 x D125mm (including mounting hardware)
Weight120g (main unit) / 80g (socket) max
TerminalsM3.5 screw terminals, 0.8-1.0 Nm torque
MountingWall or DIN rail mount
Operating Conditions-5 to 55°C, 5-90% RH non-condensing
Storage Temperature-10 to 60°C
Additional FeaturesConfigurable 6th-order polynomial linearization; RS-232C PC configuration; LED status indicator (RUN/FAIL/ERROR); optional high-load output protection (/L option)

Download MTT MS3773 Slim Plug-In Programmable Millivolt Isolator information here

Datasheet: MTT_SpecSheet_MS3773_Rev23_E

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