Elma 076
36
DC
µµµµ
A Current function (Models 079 & 076 only)
Inputs are made through the test lead terminals COM/+.
Application notes:
The DC
µµµµ
A function is designed especially for HVAC/R flame sensor applications. The
0.1
µ
A resolution is useful for identifying the minute current changes in flame detector
applications. Flame signal current check should indicate steady flame signal of at least
2
µ
A for a rectification type, or 1.5
µ
A for an ultraviolet type (8
µ
A for self checking systems).
If a flame signal current with inadequate strength or fluctuation beyond 10%, check the
following to avoid the risk of unwanted flame relay dropout :
For gas or oil flames (Minipeeper):
Low supply voltage
Detector location
Defective detector wiring
Dirty viewing windows
Faulty Minipeeper
For oil flames (Photocell):
Detector location & wiring
Smoky flame or poorly adjusted air shutter
Faulty Photocell
Temperature over 165
o
f (74
o
c) at photocell
For gas flames (Flame Rod):
Ignition interference (A flame signal current difference with the ignition both on and off
greater than 0.5
µ
A indicates the presence of ignition interference)
Insufficient ground (must be at least 4 times the detector area)
Flame lifting off burner head (ground), or not continuously in contact with the flame
rod
Temperature in excess of 600
o
f (316
o
c) at the flame electrode insulator causing short
to ground.
&
3-Phase Rotation function (Models 079 & 076 only)
Inputs are made through the test lead terminals L1/L2/L3. Phase Rotation directions are
indicated as symbolic movements by the LCD segments. Defaults at
. Press SELECT
button momentarily toggles between
and
modes.
: Hi-sensitivity mode, which detects relatively low signal outputs generated from
motor spinning, for checking phase connections of Motors.
: Normal-sensitivity mode for identifying phase sequence of MAINS (electricity
supply).
