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Intrinsically Safe Readout (VW) - Model 404

The Model 404 Intrinsically Safe Vibrating Wire Readout is a portable, low-power, hand-held unit, designed in cooperation with GEL Instrumentation, that is capable of running for more than 6 hours continuously on a single charge. The Model 404 is designed to read specific Geokon vibrating wire sensors in hazardous environments (IECEx ia, approval SIM 13.0014X) and is approved only for designated Geokon sensors, identified as Type 1, Type 2, Type 3 and Type 4. The Model 404 is based on the Geokon Model GK-404 Readout and provides 6 excitation positions (A-F) with a display resolution of 0.1 digit. It is capable of displaying the reading in either digits, frequency (Hz), period (μs) and in the case of strain gages (position C, D and E), in microstrain (µε).

Excitation Range: 400 Hz to 6000 Hz, 5 Volt Square Wave
Display Resolution: 0.1 digit, 0.1 Hz, 0.1 μs , 1 µε, 0.1°C
Timebase Accuracy: ±50 ppm
Temperature Range: −20°C to +40°C
L × W × H: 165 × 110 × 45 mm


Geokon, Incorporated, 48 Spencer Street, Lebanon, New Hampshire, 03766 · USA. Tel.: 1(603)448-1562, FAX: 1(603)448-3216, e-mail:

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