Teledyne 7320 - NDIR analyzer - Manual (Page 80)

5 Maintenance Model 7320
5-8
Teledyne Analytical Instruments
Operation noises are:
(a) Reduced output of infrared source
(5v, 110 ma each) or replace as
necessary.
(b) Noisy detector.
(c) AC pickup at printed circuit
board.
(d) Optical unit not grounded to
cabinet.
(e) Detector connections loose.
(f) Faulty preamplifier board.
(g) Contamination in cell.