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RC SYSTEMS
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ST-22 SIGNAL ISOLATOR / CONVERTER WITH OPTIONAL DUAL ALARMS
- Analog input range is field configurable via internal jumper options. Standard units offer 0-100mV, 0-1V, 0-10V and 4-20mA inputs.
- Provides 1500 Vrms input / output isolation.
- Isolated 4-20mA analog output is capable of driving 900 ohm loads.
- Useful as I / I converter which isolates and boosts loop drive capability.
- May be equipped with optional single or dual, high or low, alarm trips.
- High density DIN rail mounting with optional NEMA 4X and NEMA 7 enclosures available.
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The R. C. Systems Co., Inc. Model ST-22 Signal Isolator / Alarm accepts millivolt, volt and 4-20mA inputs and provides an isolated 4-20mA output capable of driving up to 900 ohms of loop impedance. It may also be equipped with dual, front panel accessible alarm set-points and provide dry contact alarm outputs for each. However, its primary design function is as the problem solving signal isolator.
When do you need an isolator? Due to its special abilities the ST-22 is useful in many situations where other devices do not offer adequate solutions. Following are several examples of such circumstances:
• Whenever low level signals are transmitted on top of high common mode voltages. Here the isolator's high CMV/CMR ratings are required for safe and accurate signal measurement.
• If troublesome grounds disturbances and ground loops become a problem. With no path for current to flow from input to output, isolation virtually eliminates ground loops.
• For applications which require expensive instrumentation to be protected from industrial malfunctions. The isolator's high input CMV rating guards against transients and high fault voltages.
• Or, if the instruments operate in noisy environments. Interference is often caused by radiation from motors, relays and power lines. The isolator's high CMR rating will cause unwanted signals to be blocked.
Often times problems may not be discovered until after installation. The ST-22's compact size and ease of mounting makes it easy to install later, when all other wiring is in place.
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