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Wire Triax sensor to 7-pin LEMO Connector on my vb6/vb8


How do I wire up a triaxial sensor to the 7-pin LEMO connector on my vb6 or vb8 instrument?


Your Commtest distributor can supply a triaxial sensor kit that contains all necessary cabling.

However, if you already own a triax sensor, you should be able to purchase the appropriate cable from vendors such as

Failing that, you will need to obtain the appropriate 7-pin LEMO plug and connect it to your triaxial sensor cable. The exact part numbers required will depend on the cable diameter used.

Here are the most useful options:

7-pin LEMO plug:

• FGG.1K.307.CLAC.65Z diameter 6.1 - 6.5 mm
• FGG.1K.307.CLAC.60Z diameter 5.6 - 6.0 mm
• FGG.1K.307.CLAC.55Z diameter 5.1 - 5.5 mm
• FGG.1K.307.CLAC.50Z diameter 4.6 - 5.0 mm

Black Bend Relief:

• GMA.1B.065DN diameter 6.5 - 7 mm
• GMA.1B.054DN diameter 5.4 - 6 mm
• GMA.1B.045DN diameter 4.5 - 5 mm

For the full range, see the LEMO website - (search for the FGG part numbers listed above).

Connector pinouts

These are the pin assignments on the 7-pin LEMO plug:

• Pin1 = Ground
• Pin2 = vb CH2 = X axis of triax sensor
• Pin3 = vb CH3 = Y axis of triax sensor
• Pin4 = vb CH4 = Z axis of triax sensor

You will need the data sheet of your triax sensor to determine which of its wires correspond to the X, Y, and Z axes.

The pin numbering is indicated internally on the LEMO plug as shown in this image - Pin one is circled, the succeeding pins are in counter clockwise order:

LEMO plug internal, as viewed from rear