The Speed and Key Monitor is designed for high reliability for the plant’s most critical
rotating machinery monitoring speed, phase, zero speed and direction of rotation.
This 1-slot monitor is used together with the AMS 6500 monitors to build a complete
API 670 machinery protection monitor. Applications include steam, gas, compressors
and hydro turbo machinery.
The Speed and Key Monitor can be configured for redundant mode where automatic
switchover from primary to backup tach is possible. Sensor gap voltage and pulse
counting/comparison are monitored to trigger switchover. When the Speed and
Key Monitor is operating in redundant mode, the main and failover key or speed
displacement sensor must be installed in the same axial plane to ensure phase
continuity upon failover.


Two-channel 3U size plug-in modules decrease cabinet space requirements in half from traditional four-channel 6U size cards
API 670 compliant, hot swappable module
Remote selectable limit multiply and trip bypass
Rear buffered proportional outputs, 0/4-20 mA output
Self-checking facilities include monitoring hardware, power input, hardware temperature, sensor and cable
Use with displacement sensor 6422, 6423, 6424 and 6425 and driver
CON 011/91, 021/91, 041/91
6TE wide module used in AMS 6000 19” rack mount chassis
8TE wide module used with AMS 6500 19” rack mount chassis
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