Imperial LD900 User Manual

Refrigerant Gas Leak Detector

Detects all HFO, HFC, HCFC, and CFC

Refrigerants including blends

WARRANTY

The LD900 Refrigerant Gas Leak Detector is warranted to be free of
defects in materials and workmanship for a period of two years from the
date of purchase. This warranty applies to all repairable instruments that
have not been tampered with or damaged through improper use including
unauthorized opening of the unit. Tools should be returned to the buyer’s
place of purchase.

SERVICE/TECHNICAL QUESTIONS
CALL TOLL FREE: 888.467.8665

30333 Emerald Valley Pkwy. • Glenwillow, Ohio 44139 • 888.467.8665

REPLACEMENT PARTS

Item Part Number

Sensor with Sensor Tip & Filter S77694

Sensor Filters (5 pack) S77695

Leak Test Vial S77696

Sensor Tip with Filter S77698

Parts Kit (includes sensor, test vial, & lter kit) S77697

Carrying Case S77699

LD900

User Manual

www.imperial-tools.com

[e-mail]

Design certied by ASCI

and Intertek to meet SAE

J2791 & ASCI J2913,

EN14624-2012 & ASHRAE

173-2012

Made in U.S.A.

LeakDetectors-LD900-UserManual.indd 1-1 12/7/16 1:08 PM

INTRODUCTION

The LD900 features a long life solid electrolyte sensor technology that is designed
to detect more current and difcult HFC refrigerants such as R-134a, R-410A,
R-404A, R-407A, and R-507 in addition to the new HFO-1234yf and all HCFC (R-

22) and CFC (R-12) refrigerants including SNAP approved hydrocarbon blends.

Our unique digital leak size indicator takes the guesswork out of whether to repair
a small leak. The digital display is independent from the audio alarm and sensitivity
level, allowing the precise pinpointing of the leak source.

The LD900 does not require rechargeable batteries.

FEATURES

• Unique numeric leak size indicator

• Long life, stable sensor

• R-134a sensitivity .05 oz/yr

• R-1234yf sensitivity .015 oz/yr

• R-22 sensitivity .025 oz/yr

• Design certied to meet SAE J2791, SAE J2913, European EN14624

• Automatic calibration and reset to ambient

• Visual LED leak alarm near sensor

• 3 adjustable sensitivity levels

• Low battery indicator

• True mechanical pump

• Audio mute function

• Uses 4 AA alkaline batteries

• CE Certied

• Comfortable Sanoprene grip

• 2-year warranty includes sensor

• Made in USA

OPERATING INSTRUCTIONS

1. TURN ON: Press the ON/OFF button once to turn on and again to turn off.

NOTE: Hold button down for approximately 1 second to turn unit off.

2. WARM UP: The detector automatically starts heating the sensor. During the
heating cycle, the digital leak size indicator will ash 0 and the detector will sound
a slow “beep”. Warm up time is usually less than 20 seconds.

3. READY: The detector is ready to begin searching for leaks when the ashing
0 stops and the green sensitivity LED turns on. The audio “beep” increases in
frequency and the probe LED begins to blink steadily.

4. SEARCHING: When searching for leaks, move the sensor tip along A/C lines
and ttings no further away than 0.4 in. (9.5 mm) and no faster than 3 in./sec. (75
mm/sec.) If the detector alarms, make smaller sweeps back and forth until the leak
source can be pin pointed. NOTE: The LD900 only responds to changes in leak
concentration. The alarm will re-set automatically if the sensor tip is held at the leak
source. If the leak detector has been out of use for an extended period, weeks or
months, the following action is recommended. Power on the instrument and allow it
to come out of warm up. Then run it with the sensitivity level in the Hi (high) position
for several minutes before testing it with the Leak Test Vial. This action will guarantee
that the sensor is fully conditioned for maximum response to refrigerant gas.

Digital Leak Size Indicator

Low Battery Indicator
Sensitivity Level Indicators
Audio Mute & Sensitivity Level Selectors
Power On/Off

LD900 CONTROL PANEL

2 3

LeakDetectors-LD900-UserManual.indd 2-3 12/7/16 1:08 PM