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Intrinsically Safe Readout (VW) | Model 404

  • Close-up of the Model 404 Intrinsically Safe Vibrating Wire Readout LCD display.
  • The Model 404 Intrinsically Safe Vibrating Wire Readout.
  • The Model 404 is easily held and operated with one hand.
  • The Model 404 shown in carry case (included).
  • The Model 404 sensor cable and compact charger (included).
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

Please Note: GEOKON maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. Various instruments are discontinued over time and replaced with new, updated models.