Omega 3200ST, 3400ST manual Symptom Possible Cause Method of Correction

Symptom	Possible Cause	Method of Correction
Inaccurate control	Insufficient or varying power	Check the power supply
		output and increase if
		necessary
	Insufficient pressure	Ensure the pressure (an
		differential pressure) is high
		enough o operate the unit.
	Varying pressure	Check the stability of the
		pressure regulation and
		improve if necessary.
	Ambient temperature too high	Place the unit in a suitable
	or too low	environment
	Output load resistance too low	Ensure the voltmeter or
		data acquisition system or
		display has an impedance of
		greater than of 2.5kohm
	Gas temperature too high or	Ensure the gas temperature
	too low	is within the recommended
		operating range
	Unit damaged or faulty	Contact Omega Engineering
Problems with	Gas flow through unit not	Ensure there is no flow
rezeroing	completely stopped	through the unit. The
		easiest way to do this is to
		plug both the inlet and
		outlet.
	Severe fluctuations in the	Carry out the rezero
	ambient temperature e.g. unit	procedure in a stable
	in direct sunlight	environment
	Unstable power supply	Check the stability and
		suitability of the power
		source
	Insufficient warm-up period	Allow the unit to warm-up
		for at least 5 minutes.

M-4271/0707, pg. 24 of 26