Electrical Stability Tester (EST)

Electrical Stability Tester (EST)

Fann Instrument Company introduces a new Electrical Stability Tester for use with oil-based drilling fluids.  Mud engineers depend on the electrical stability test to monitor a fluid’s emulsion stability and oil-wetting capability. The new tester is simpler to operate and can be used in the lab or in the field anywhere in the world.

The Model 23E Electrical Stability Tester (EST) conforms to the test procedure described in  API Recommended Practice 13B-2.  It operates on external power or two nine volt batteries.  The Model 23E is calibrated in peak volts which is the maximum voltage that the fluid experiences between the two electrodes. Peak voltage may be converted to Root Mean Square (RMS) voltage by multiplying the peak voltage by 0.7071.


  • Internal power supply and built in AC power plug allow universal operation
  • Power requirements - 100 to 240 VAC, 50/60 Hz, 10 watts
  • Portable operation on two (2) nine volt batteries
  • Self-calibration for immediate performance checks
  • Large backlit display is easy to read, even in low light

EST Model 23EOrdering Information

Part Number 102130986   Electrical Stability Tester



Output Frequency 340 ± 2 Hz
Output wave form Sinusoidal, <1% total harmonic distortion
Output voltage range 0 to 2025 V ± 25 V peak to ground (1432 Volts RMS)
Breakdown peak output current 61 micro-amps
Peak Volts readout Backlit Digital LCD
Voltage ramp rate 150 ± 10 V/second
Power supply Two 9-Volt alkaline batteries
100-240 VAC, 50/60 Hz, 10 watts
Battery life Approximately 250 tests
Dimensions 8.3 X 5.1 X 2.8 in. (21 X 13 X 7.1 cm)
Complete Weight 4 lbs (1.8 kg)
Probe and Cable length 24 in (61 cm)
Probe Electrode Spacing 0.061 in. (0.155 cm)
Operating temperature range. 32° to 122°F (0° to 50°C)












Electrical Stability Tester

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Summary Electrical Stability Tester, Model 23E Instruction Manual Jun 2013
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