Vibro-Meter IQS450 Signal Conditioner

Drive Voltage: –20 V to –32 V DC (≈ 13 mA) to excite the TQ401 probe

Measuring Range: 0–4 mm linear span (≤ 1 % non-linearity with matched probe)

Frequency Response: DC to 20 kHz (–3 dB)

4–20 mA Loop:

Scaled: 4 mA @ 0 mm → 20 mA @ 4 mm

Drive capability up to 800 Ω

Fail-safe: < 3 mA indicates open-circuit or probe fault

Cable: 10 m PTFE-insulated, stainless-steel-braided coax

Operating Temp.: –25 °C to +65 °C; Storage: –40 °C to +85 °C

Shock & Vibration: 6 g half-sine, 11 ms; 5–35 Hz @ 0.15 mm / > 35 Hz @ 1 g

Humidity: Up to 95 % non-condensing

Mounting: Hot-swappable into any VM600 backplane slot

Designed for safe-area use; pairs with external IS barriers when required

Simplifies wiring and integration—ideal for long‐distance runs and PLC/DCS analog inputs.

Fail-safe behavior (< 3 mA) flags open/short faults without additional wiring.

DC–20 kHz flat response captures both slow shaft displacements and high-frequency vibration.

≤ 1 % linearity over full 0–4 mm range ensures accurate gap measurement.

Built-in 10 m low-capacitance cable preserves signal fidelity in large machinery rooms.

Robust PTFE insulation and steel braid resist chemicals, abrasion, and EMI.

On-board diagnostics drive loop current below 3 mA on open or short.

Front-panel LED provides a quick “OK” vs. fault status indication, even during hot-swap.

VM600 6 U form factor; can be inserted/removed under power without disrupting the rack.

Optional conformal coating available for harsh or corrosive environments.

Rear-plane connection supplies power and routes loop output to I/O modules or DCS.

Compatible with VibroSight via external modules that convert loop signals to digital data

Two TQ401 probes on vertical/horizontal axes feed separate IQS450 B23 modules.

4–20 mA loops tie directly into turbine control PLCs, triggering alarms if eccentricity exceeds limits during startup or load changes.

A TQ401 at the compressor impeller face monitors clearance; IQS450 loop output drives emergency load-shedding logic when gap < 0.5 mm.

Maintains safe operation without requiring complex voltage-bus wiring.

Probes on runner bearings feed IQS450; loop outputs integrate with SCADA for continuous shaft-center tracking and DCS interlocks.

Enables early detection of thermal bow or draft tube resonance without direct VM600 bus connections.