STI-638
The STI-638 tachometers encased in a tight, wall-mounted housing (IP 67) with 6-digit, large LED display are designed to control rotational or linear speed of moving objects. The device is also able to measure frequency. As an additional advantage the device can convert the rotational / linear speed into inverse values, and to display the single revolution period or process duration. The 24V DC / 100 mA output is designed to supply measuring transducers, and the RS-485 port enables data transmission in production process monitoring systems.The REL / OC control outputs can be programmed depending on the instantaneous value of rotational speed. Additionally the counter may be equipped with analogue outputs, according to the customer selection: active current output, passive isolated current output or active voltage output. The counter may be configured with no need to open the case, by using the remote controller or with free S-Config software via the RS-485 communication port.
Parameters
| Power supply | 19V ÷ 50V DC; 16V ÷ 35V AC or 85 ÷ 260V AC/DC, all separated |
|---|---|
| Power consumption | for 19V ÷ 50V DC: max. 8,7 W; for 16V ÷ 35V AC max. 13 VA; for 85 ÷ 260V AC/DC max. 29 VA |
| Display | LED, 6 x 38 mm high, red, green or blue (according to order) |
| Inputs | pulse, fully isolated, with debouncing filter and pulse width control, max. input frequency 50.0 kHz |
| Accuracy | ± 0.02% ± one digit (full temperature range) |
| Measurement range | displayed values range: 0 ÷ 999999 + decimal point; operation range: 1,5 ÷ 50 000 rpm |
| Input levels | low level: 0 V ÷ 1 V; high level: 10 V ÷ 30 V (about 12 mA @ 24V) |
| Binary outputs | 1, 2 or 4 relays 1A/250V AC (cos fi=1) or the OC 30mA/30VDC/100mW; transducer power supply output: 24V DC +5%, -10% / max. 100 mA, stabilized |
| 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 |
| Pulse waiting time | settable from 0,1 do 39,9 seconds |
| Rotational speed precision | selected in the range 0 ÷ 0.00000 of unit (revolutions per second, per minute, per hour) |
| Communication interface | RS-485 / Modbus RTU (not galvanically isolated) |
| Transmission parameters | 1200 ÷ 115200 bit/s, 8N1 and 8N2 |
| Operating temperature | 0°C ÷ +50°C (standard), -20°C ÷ +50°C (option) |
| Storage temperature | -10°C ÷ +70°C; -20°C do +70°C (depending on version) |
| Data memory | non-volatile memory, EEPROM type |
| Case | wall-mounted |
| Case dimensions | 230 x 140 x 96,5 mm |
| Protection class | IP 67 |
