The MTT MS3762 Slim Plug-In Subtractor takes two independent DC current or voltage signals and produces a single output proportional to the difference between them. This is a convenient way to derive deviation, differential, or trim measurements directly at the field-panel level, such as calculating the pressure difference across a filter or the deviation between a setpoint signal and a live process value, without needing custom subtraction logic programmed into a PLC.
Independently configurable scaling factors on each input allow the two signals to be weighted before the subtraction is performed, so engineers can build differential calculations that match the specific ratio required by the process. Front-accessible trimmers provide on-site zero and span adjustment, and an optional fast-response configuration is available for applications where the differential output needs to track rapidly changing inputs. Four-way galvanic isolation between input, output, and power keeps the subtracted signal clean and protected from ground loops elsewhere in the panel.
| Input Ranges | DC current -100 to 100mA (100µA-200mA span); voltage -300 to 300V (200mV-600V span) |
| Input Resistance | 1MΩ min. (voltage); 10Ω-250Ω (current, varies by range) |
| Max Allowable Input | 40mA DC max (current model); 30V DC max (voltage model) |
| Input Bias | -100% to +100% |
| Output Ranges | 0-20mA (current) or -10 to +10V (voltage); output span 4-20mA or 10mV-20V |
| Output Load | 750Ω max (single 4-20mA); 550Ω/350Ω (dual outputs) |
| Adjustment | ±5% zero and span via front trimmers |
| Subtraction Formula | Output (%) = IN1(%) x K1 – IN2(%) x K2 |
| Isolation | 4-way isolation between input, outputs, power, and ground; 100MΩ min. insulation resistance @500V DC; 2000V AC dielectric strength (input/output), 500V AC (between outputs) |
| CMRR | 100dB min. @500V AC, 50/60Hz |
| Power Supply | 100-240V AC (85-264V, 47-63Hz), 24V DC ±10%, or 100-240V DC (85-264V); 4.5-5.5VA max (AC) / 1.4-1.7W max (24V DC) / 4.8-6.0W max (100-240V DC) |
| Accuracy | Better than ±0.1% of span (at 25°C±5°C); ±0.2% per 10°C temperature effect |
| Response Time | 85ms max (0-90%); optional 10ms max with /K option |
| Dimensions | W29 x H86 x D125mm |
| Weight | 120g (main unit) / 80g (socket) |
| Terminals | M3.5 screw terminals, nickel-plated steel contacts, 0.8-1.0 Nm torque |
| Mounting | Wall or DIN rail mount |
| Operating Conditions | -5 to 55°C, 5-90% RH non-condensing |
| Storage Temperature | -10 to 60°C |
Frequently Asked Questions
What is the MTT MS3762 used for?
It’s a two-input signal conditioner (subtractor) that takes two independent DC current or voltage signals and produces a single output proportional to their difference. It’s a convenient way to derive deviation, differential, or trim measurements at the field-panel level, such as calculating the pressure difference across a filter or the deviation between a setpoint and a live process value, without custom subtraction logic in the PLC.
How does the weighting/subtraction work?
Each input channel has its own configurable scaling factor, so the output equals IN1 times K1 minus IN2 times K2. That lets the two signals be weighted differently before the subtraction, not just a straight 1:1 difference.
How is the MS3762 different from the MS3761 adder?
Both are two-input signal conditioners with the same input/output signal ranges and front-panel zero/span trimming, but the MS3761 sums its two weighted inputs (IN1 x K1 + IN2 x K2) while the MS3762 subtracts them (IN1 x K1 – IN2 x K2). Pick based on whether you need a combined total or a difference.
What input and output signal types does it accept?
Input accepts current (-100 to 100mA) or voltage (-300 to 300V), and output is a standard 0-20mA current or -10 to 10V voltage span, single or dual. Tell us your two input signal types and we can confirm the setup.
How do I know if the MS3762 is right for my application?
If you need a live differential or deviation reading from two DC signals, such as a filter’s differential pressure or a setpoint-versus-actual comparison, the MS3762 handles that without extra PLC logic. Send us both input signal types and the weighting you need and we can confirm before you order.
Download MTT MS3762 Slim Plug-In Subtractor information here
Spec Sheet: MTT_SpecSheet1_MS3762_Rev270_E
Manual: MTT_Manual1_MS3762_Rev140_E
