plms meaning in oil and gas

Precision Light Measurement Source

Manufacturer of Line of Sight Infa-red Gas Detectors such as the GD4001 and GD4014. Now obsolete, the company was taken over by Draegar who manufacter a replacement model - GD60. These items are I.S. 4 - 20mA and do not have heated optics, therefore they are not reccomended for offshore installations.