Istec SpeedSys T20 two-channel speed monitor
Istec SpeedSys T20 is a two-channel speed monitor and switch with redundant power supplies. It adds acceleration, standstill, creep and reverse-rotation monitoring and a dynamic channel comparison, and it is a functional replacement for the discontinued Jaquet T501 and T601. MK-Controls Oy is the Istec distributor in Finland.
T20 in 3D – two channels, compared
Follow two speed sensor channels through the T20 and see the channel comparison, the relay trip and the outputs. The scenario is illustrative, not real plant data. Press play or pick any chapter.
- Two channels. Two independent channels with redundant power supplies.
- More monitoring. Acceleration, standstill, creep, reverse rotation and dynamic channel monitoring.
- Voting. Software voting 1oo2 and 2oo2.
- Replaces Jaquet. T501 and T601 (T20 or T30).
Planning a tachometer replacement?
Send us the Jaquet type and the number of units and we will recommend the matching SpeedSys. Quoted prices are available for multiple units. Need just one unit? Order it directly from our webshop.
Frequently asked questions
Which Jaquet units does T20 replace?
Istec developed T20 and T30 as the functional replacements for the Jaquet T501 and T601, with minimal modification. Send us the Jaquet type and we confirm the matching unit.
What does the second channel add?
Two independent sensor channels with a dynamic channel comparison, plus software voting 1oo2 and 2oo2. T20 also monitors acceleration, standstill, creep and reverse rotation.
How is T20 powered?
T20 has redundant power supplies and is powered by 24 VDC.
Is T20 SIL rated?
We make no SIL claim for T20. If you need a certified overspeed protection system, ask us about SpeedSys 200.
More from this series: All SpeedSys models · T10 explainer · T30 explainer.
Sources: Istec SpeedSys datasheet v1.20, Istec’s functional-replacement letter for the Jaquet T4xx/T5xx/T6xx range and Istec’s life-cycle statement of 26 April 2024. Jaquet is a trademark of its owner TE Connectivity. SpeedSys is developed and manufactured by Istec; MK-Controls Oy supplies Istec products in Finland.