18
®
Application notes for flame sensors:
DC
A function is useful for HVAC/R flame sensor applications.
The 0.1
A resolution can identify the minute current changes in
flame detector applications. Flame signal current check should
indicate steady flame signal of at least 2
A for a rectification type,
or 1.5
A for an ultraviolet type (8
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 :
CAUTION
Discharge capacitors before making any measurement. Large
value capacitors should be discharged through an appropriate
resistance load.
A, mA and A Current
Press SELECT button momentarily to toggle between DC and AC.
Last selection will be saved as power up default for repeat
measurement convenience.
®
17
TM
Resistance, BeepLit Continuity”;
Press the SELECT button momentarily to toggle the functions. Last
selection will be saved as power up default for repeat measurement
convenience.
BeepLitTM Continuity
function is having improved convenience
for checking wiring connections and operation of switches. A
continuous beep tone together with flashing display backlight
indicate a complete wire. Such audible and visible indications
improve continuity readabilities in noisy working environments.
