STI-94
STI-94 ratemeters are the board-type ratemeters designed to control rotational speed (from 1,5 to 50000 rev/min) or its inversion (revolution period). Available parameters of divider and multiplier enable flexible scaling of measure and transformation into linear speed. On top of that, they enable operation in the frequency and period meter mode, what allows to show e.g. material linear speed, baking time, drying time, revolution period. The REL / OC control outputs can adjust the level of measured signal and are controlled according to one or two threshold values. Moreover, the meter can be equipped with analogue outputs, according to the customer selection: active current output, passive isolated current output or active voltage output. The meter can be configured with the local keyboard or free S-Config software via the RS-485 communication port.
Parameters
| Power supply | 19V ÷ 50V DC; 16V ÷ 35V AC or 85 ÷ 260V AC/DC |
|---|---|
| Measurement range | 0 ÷ 999999 + decimal point |
| Power consumption | for 85 ÷ 260V AC/DC and 16V ÷ 35V AC power supply: max. 4,5 VA; 19V ÷ 50V DC power supply: max. 4,5 W |
| Input | pulse, fully isolated, with debouncing filter and pulse width control, max. input frequency 50.0 kHz |
| Data memory | non-volatile memory, EEPROM type |
| Analogue outputs | (available with 2 x REL or OC, see ordering): active current: operating range 0/4-20 mA (max. 0-24 mA), load resistance 700 Ω max., resolution 13 bit passive current: isolated, operating range 4-20 mA (max. 2,8-24 mA), load resistance 600 Ω@24VDC, resolution 13 bit; active voltage: operating range 0/1-5V, 0/2-10V (max. 0-11V), load resistance min. 2000 Ω, resolution 13 bit |
| Communication interface | RS-485 / Modbus RTU (not galvanically isolated) |
| Output | 2 or 4 relay 1A/250V AC (cos fi=1) or OC 30mA/30VDC/100mW; power supply output: 24V DC + 5% -10% / max 100 m |
| Transmission parameters | 1200 ÷ 115200 bit/s, 8N1 and 8N2 |
| Storage temperature | -10°C ÷ +70°C or -20°C do +70°C (depending on version) |
| Operating temperature | 0°C ÷ +50°C (standard), -20°C ÷ +50°C (option) |
| Accuracy | frequency measurement: ± 0.02% (full temperature range) |
| Case | panel mounting |
| Case dimensions | 96 x 48 x 100 mm |
| Protection class | IP 65 (front), available additional frame IP 65 for panel cut-out sealing; IP 20 (case and connection clips) |
| Panel cut-out dimensions | 90,5 x 43 mm |
| Display | LED, red, 6 x 13 mm high |
| Rotational speed unit | revolutions per second (rps), per minute (rpm), per hour (rph) |
| Pulse waiting time | settable from 0,1 to 39,9 seconds |
| Rotational speed accuracy | selected in the range 0 ÷ 0,00000 |
| Installation depth | min 102 mm |
