Amprobe ACD-14 TRMS-PLUS 사용 설명서 - 페이지 10

{카테고리_이름} Amprobe ACD-14 TRMS-PLUS에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Amprobe ACD-14 TRMS-PLUS 16 페이지. Tech clamp

Application notes:

1) The DC µA function is designed especially for HVAC/R flame sensor applications.

The 0.1µA 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 2µA for a rectification type, 1.5µA for an ultraviolet type, or 8µA

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:

1.1) For gas or oil flames (Minipeeper):

Low supply voltage

Detector location

Defective detector wiring

Dirty viewing windows

Faulty Minipeeper

1.2) For oil flames (Photocell):

Detector location & wiring

Smoky flame or poorly adjusted air shutter

Faulty Photocell

Temperature over 165°F (74°C) at photocell

1.3) For gas flames (Flame Rod):

Ignition interference (A flame signal current difference with the ignition both on

and off greater than 0.5µA 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°F (316°C) at the flame electrode insulator,

causing short to ground.

HOLD

The hold feature freezes the upper ACA display for later viewing. Press the HOLD

button momentarily to activate or exit this feature.

MAX

The Max feature compares and displays the measured maximum value (on the upper

ACA display) as fast as 25ms with auto-ranging capability. Press the MAX button for 1

second or more to activate or exit this feature.