221 Multielectrode Resistivity Tool

The 221 ED is a standard normal resistivity tool, primarily used for water well logging. The tool measures normal resistivity (16” and 64” ), single point resistance (SPR) and spontaneous potential (SP). As reference point bridle electrode is used. SP can be measured in passive mode, with tool powered off, using 16” electrode and surface reference electrode.

TECHNICAL DESCRIPTION:

General:

• Tool Diameter: 36mm
• Tool length: 180 cm
• Weight: 6kg.
• Max. pressure: 20MPa
• Temperature range: up to 125 °C
• Output signal: digital
• Power Consumption: 90Vdc/max. 90mA
• Cable: Designed for single conductor cable
• Borehole type : Open (water-filled)

Measurement range:

• SP:     -2.5 V  to   2.5 V
• 16” :    1 – 10.000 Ohm
• 64” :    1 – 10.000 Ohm
• SPR:    1 – 10.000 Ohm

Optional:

• Extended working temperature: up to 175°C
• Custom output signal
• Custom tool head and diameter