Geochain Monitor Panel (GMP-1)

The digital GeochainTM product ranges are all supplied operating current at surface via a Geochain Monitor Panel.  This differs from the older Geochain Power Panel (GPP) through the addition of enhanced QC and ergonomic functionality whilst enabling both DC power and AC data to be transmitted over same wireline cable.

The GMP has inbuilt safety features to maximise user protection during Geochain operation.

GMP Datasheet


Main Features
  • The GMP is the latest surface panel which controls the power supply for a Geochain System,
  • Single and Dual power supply options,
  • The GMP can accommodate two power supplies, which is necessary for very long Geochain systems,
  • The GMP monitors the current balance in both the MTX (downlink) conductors and LRX (uplink) conductors,
  • Inbuilt wireline simulator,
  • Inbuilt safety features.

The GMP is Avalon’s latest surface panel and is used to control the power supply for a Geochain System (Geo/Slim/EHP)

The new Geochain Monitor Panel (GMP) combines the full functionality and safety features of its predecessor (GPP) with an integrated wireline interface box, wireline simulator and monitor viewer to fully QC the wireline performance.

Unlike its predecessor the GMP is able to operate optimally in constant current, thus ignoring any adverse affects and unknowns from variable wireline resistances.

The GMP uses one or two of the new Glassman LPC600 supplies. These are more compact and offer much better noise performance than the older LVP supplies used in the GPP.

The unit can be configured for 4 or 6 wire telemetry and single or dual Glassman supplies (longer string operation).  It offers a considerable cost saving in comparison to purchasing the four old panels.

GMP supervisor board

In priority order, the functions of the GMP supervisor board are:

  1. To minimise the risk of harm to personnel,
  2. To minimise the risk of damage to incorrectly connected equipment,
  3. To enable the Geochain tool system to be reset under program control,
  4. To enable automated logging of Geochain operating current and voltage.

Upon powering up, the GMP supervisor board performs a short series of electrical tests, using safe voltage levels, to check for the presence of a Geochain VRS (Voltage Regulator Section). If a VRS or Slim VRS is not detected, then the GMP output is inhibited and the appropriate fault is signalled by front panel status indicators.

During operation, the GMP supervisor board continuously monitors output voltage and current. In the event of a sudden change in either parameter, the GMP output is again inhibited and the appropriate fault signalled.

GMP Specifications
Power Supply 2 x Glassman LPC600-1.4
Output Voltage: 600 V
Output Current: 1.42 A
Output Power: 850 W
Rated AC Input Voltage: 90-240 Vac (nominal)
Input Harmonic Distortion: EN61000-3-2 compliant
Operating Temp Range: 32 to 104°F (0 to 40°C)
Storage Temperature Range: -20° to 140°F (-20° to 60°C)
Humidity Range: 30% to 90% RH, non-condensing
Format: 19” rack mountable case
Width: 450 mm (480mm inc. ears)
Height: 4U (180 mm)
Depth: 385 mm behind mount ears plus 45 mm in front of ears
Weight: 27 kg
AC Input Connector Type: IEC320
Fuses: 20 A, 250 V, 5 x 20 mm slow