ProSens QM-421 is a SIMEX ProSens industrial instrument combining transmitter, display, meter and controller functions. Its sensing hardware is model-specific, so the probe geometry and measurement envelope are kept distinct from the common ProSens electronics. It combines Axial integrated probe, L=200 mm, Ø12 mm, stainless steel 316L probe and filter cap and Universal current, voltage, millivolt, RTD and thermocouple inputs for practical industrial operation.
Explore performance details, construction highlights, applications, and technical information in one clear overview.
ProSens QM-421 is a SIMEX industrial measurement and control solution designed for dependable integration into process monitoring and automation systems. Its configuration brings together practical measurement, indication, signal handling and control functions in a format suited to industrial use.
ProSens QM-421 supports flexible signal handling for applications where different process, electrical or temperature signals need to be brought into one instrument. The available input configuration includes Axial integrated probe, L=200 mm, Ø12 mm, stainless steel 316L probe and filter cap; Universal input; and 0/4...20 mA; 0...60/75/100/150 mV; 0/1...5 V; 0/2...10 V; Pt100/Pt500/Pt1000: -100...+600 °C; TC K: -200...+1370 °C; S: -50...+1768 °C; J: -210...+1200 °C; T: -200...+400 °C; N: -200...+1300 °C; R: -50...+1768 °C; B: +250...+1820 °C; E: -200...+1000 °C. This flexibility helps simplify instrument selection when a system requires multiple signal types or ranges.
For integration with external equipment, ProSens QM-421 provides defined output and control capabilities. The available configuration includes 24 V AC / 35 V DC, max. 200 mA; active 0/4...20 mA: 0...24 mA max., 700 Ω max., 13-bit; passive 4...20 mA isolated: 2.8...24 mA max., 600 Ω at 24 V DC, 13-bit; active 0/1...5 V or 0/2...10 V: 0...11 V max., minimum 2000 Ω, 13-bit and 11...36 V DC; 16...36 V DC when 0...10 V output is used. These options allow measured values and control states to be connected to the wider automation system according to the selected configuration.
The ProSens QM-421 combines local indication with communication capabilities where provided by the configuration. Available details include no display or optional LCD, 128 × 64 pixels, graphic, with backlight; RS-485 / Modbus RTU; 1200...115200 bit/s; 8N1 / 8N2; and Optional 2.9-inch graphic LCD, 128 × 64 points, with backlight. This makes the instrument suitable for installations where operators need clear local information while the device also exchanges data with a control or monitoring system.
Configuration and signal-processing functions give ProSens QM-421 additional flexibility beyond basic indication. Its listed capabilities include polycarbonate / ASA LURAN; A+B, A-B, (A+B)/2 and dew point; and Free S-Config configuration software. These functions can help adapt the instrument to the required measurement method, display behaviour and operating workflow without changing the underlying product platform.
The physical and electrical design of ProSens QM-421 is defined by its available power supply, environmental and construction characteristics. The listed configuration includes -50...120 °C, typical error ±0.5 °C at -10...+85 °C. Temperature/humidity: -40...120 °C; 0...100 %RH; typical temperature error ±0.2 °C at 10...60 °C, 0.4 °C at -30 °C and 0.7 °C at 120 °C; typical humidity error ±1.8 %RH at 20...80 %RH and 25 °C; -30...+80 °C for the electronics case; IP65 / IP67; wall, except QM-100 which is DIN rail; and 120 × 90 × 50 mm. These details provide the information needed to assess compatibility with the intended installation environment and system requirements.
ProSens QM-421 is suited to installations where dependable measurement, clear indication and straightforward integration are important. Its combination of signal capabilities, configurable functions, outputs and interface options provides a practical platform for connecting measurement tasks with industrial monitoring and automation equipment.
Detailed model information is provided in the specification and feature tables, including available signal ranges, outputs, communication interfaces, functions, power requirements and construction details. Review the tables for the exact configuration and technical values of ProSens QM-421.
| Feature | Specification |
|---|---|
| Probe | Axial integrated probe, L=200 mm, Ø12 mm, stainless steel 316L probe and filter cap. |
| Temperature | -50...120 °C, typical error ±0.5 °C at -10...+85 °C. Temperature/humidity: -40...120 °C; 0...100 %RH; typical temperature error ±0.2 °C at 10...60 °C, 0.4 °C at -30 °C and 0.7 °C at 120 °C; typical humidity error ±1.8 %RH at 20...80 %RH and 25 °C. |
| Input Type | Universal input |
| Signal Range | 0/4...20 mA; 0...60/75/100/150 mV; 0/1...5 V; 0/2...10 V; Pt100/Pt500/Pt1000: -100...+600 °C; TC K: -200...+1370 °C; S: -50...+1768 °C; J: -210...+1200 °C; T: -200...+400 °C; N: -200...+1300 °C; R: -50...+1768 °C; B: +250...+1820 °C; E: -200...+1000 °C |
| Electronic relay NO | 24 V AC / 35 V DC, max. 200 mA; active 0/4...20 mA: 0...24 mA max., 700 Ω max., 13-bit; passive 4...20 mA isolated: 2.8...24 mA max., 600 Ω at 24 V DC, 13-bit; active 0/1...5 V or 0/2...10 V: 0...11 V max., minimum 2000 Ω, 13-bit |
| Power supply | 11...36 V DC; 16...36 V DC when 0...10 V output is used |
| Display | no display or optional LCD, 128 × 64 pixels, graphic, with backlight |
| Communication | RS-485 / Modbus RTU; 1200...115200 bit/s; 8N1 / 8N2 |
| Operating temperature | -30...+80 °C for the electronics case |
| Protection | IP65 / IP67 |
| Case | polycarbonate / ASA LURAN |
| Mounting | wall, except QM-100 which is DIN rail |
| Case dimensions | 120 × 90 × 50 mm |
| Mathematical functions | A+B, A-B, (A+B)/2 and dew point |
| Function | Optional 2.9-inch graphic LCD, 128 × 64 points, with backlight |
| Function | Free S-Config configuration software |
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