Sentry ST312A User manual

ST312A
Refrigerant
Leak Detector
Instruction Manual
Ver. 01 _20220622.

Table Content
1.
Introduction
1-1. Features
1-2. Applications
2.
Safety Information
2-1. Safety symbols
2-2. Warning
3.
Product Specifications
4.
General Descriptions
4-1. Parts and Control Panel
4-2. Lithium Battery Storage and Care
4-3. Charging the Lithium Battery
5. Operating Instructions
5-1. Main Function
5-1-1 Button Function -----------------------------
5-1-2 Low Battery Indicator ---------------------------
5-1-3 Sensor Failure Indicator -----------------------
5-2. Start with Auto/ Manual Reset Mode
5-2-1 Manual Reset Mode Inspection ---------------
5-2-2 Auto Reset Mode Inspection -----------
6. Maintenance
6-1. Leak Test Bottle
6-2. Probe Tip
6-3. Clean
6-4. Replacement Parts

1. Introduction
Thank you for purchasing the refrigerant leak detector.
Read through this instruction manual before operating the unit.
Please also store and retain this instruction manual for future reference.
1-1.Features
●LED Tip light ●3 adjustable sensitivity levels
●Mute function ●DC 3.7v rechargeable lithium battery
●USB power adaptor ●Extremely sensitive semiconductor sensor
●LED power indicator ●Multiple colors LED for leak level indictor
●Low battery indicator ●Detects R-22, R-32, R-134a, R-410a,andR-407c etc.
●Rugged flexible probe ●Automatic adjustment and reset to background
●Sensor failure indicator ●
Microcontroller circuitry that guarantees accuracy
and reliability
1-2.Applications
●Refrigeration ●Semiconductor production
●Air conditioning ●HVAC
●Laboratory accurate ●Automotive service
●Systems engineering ●Aircraft construction industry

2. Safety Information
Read the following safety information carefully before attempting to operate or
service the meter.
Only qualified personnel should perform repairs.
2-1.Safety symbols
Certification
This instrument conforms to the following standards:
EN61326-1:2021 : Electrical equipment formeasurement,control
and laboratory use
equipment EMC test.
IEC61000-4-2 : ESD immunity test.
IEC61000-4-3 : Radiated, radio-frequency,Electromagnetic field immunity test.
IEC61000-4-8 : Power frequency magnetic field immunity test.
RoHS
Restrict to use of ten substances within electrical and electronic equipment (EEE),
thereby contributing to the protection of human health and the environment.
REACH (SVHC)
The device of used materials content no following substances that list of proposed
REACH substances of very high concern.
The device may not be disposed of with the trash. It promotes the re-use
recycling and other forms of recovery of used materials and components, and
to improve the environmental performance of all operators (manufacturers, traders
and treatment facilities) involved in the life cycle of products. Dispose of the product
appropriately in accordance with the regulations in force in your country.

2-2.Warning
Please read the manual carefully to ensure safe and correct use of this meter before
using.
Please reread if necessary.
Be sure to adhere to the following points to avoid injury.
●Do not attempt to replace the sensor and LED.
●Do not attempt to repair it yourself if the meter is malfunction.
Only qualified personnel may do it.
●Do not force to bend the flexible probe over its limit of angle.
●Do not subject the probe tip to impact that could break the inside sensor.
●Do not use the meter in places where flammable or nearby the fire.
●Do not use this meter in environments outside this range: 32°F (0°C) to 122°F (50°C)
●Never use organic solvents to clean the meter.(Such as thinner, benzene, etc.)

3. Product Specifications
Model 312A
Sensor Semiconductor
Refrigerants R-22, R-32, R-134a, R-404a, R-410a,
and all CFCs, HCFCs and HFCs
Sensitivity levels High：0.15 oz/year(4g/year)
Medium：0.25 oz/year(7g/year)
Low：0.5 oz/year(14g/year)
Accuracy Compatibility with SAE J2791
Calibration Manually reset to background level
Automatic reset to background level
Response time Less than 0.5 second
Warm up time Approx. 50 seconds
Battery type 3.7V DC, 1960mAh rechargeable lithium
battery
Battery life Max. up to10 hours continuous use
after fully charged.
Sensor failure notification Yes
Audio alarm Yes(Buzzer)
Fan system Yes
Auto power off 10 minutes of idle.
Low battery indicator Yes (Battery Icon)
Tip light Yes
Flexible probe length 18”(450mm)
Operating temp. and %RH 32°F ~ 122°F(0°C ~ 50°C), ＜80%RH
Storage temp. and %RH 14°F ~ 140°F(-10°C ~ 60°C), ＜70%RH
Dimensions 7.2”x 2.8”x 1.6”(184 x 70 x 40 mm)
Weight 12 oz.(340g)
Accessories Included : Quick user's guide, USB cable, Leak test bottle
Option to buy: Charger, Rubber protector, Hard carrying case

4. General Descriptions
4-1. Parts and Control Panel
1. Power Button 9. Back Light ON/OFF Button
2. Sensitivity Level Indicator 10. Reset/Back Light Indicator
3. Leak Level Indicator 11. Reset Indicator
4. Sensor failure Indicator 12. MuteIndicator
5. Low Battery Indicator 13. Buzzer Output
6. Charging Indication 14. Mute Button
7. Reset Button 15.
Sensitivity Button(High、Medium、Low)
8. Tip Light LED ON/OFF Button 16. Flexible Probe
17. Tip Light

4-2.Lithium Battery Storage and Care
●Operating Temperature and Humidity:
Discharge : 32°F ~ 122°F(0°C ~ 50°C) ,less than 80% RH
Charging : 32°F ~ 113°F(0°C ~ 45°C) ,less than 80% RH
●Storage Humidity: Less than 70% RH
●Storage temperature and capacity recovery:
Temperature range Duration Capacity recovery
-4°F ~ 139°F (-20°C ~ +60°C) 1month 75%
-4°F ~ 113°F (-20°C ~ +45°C) 3months 70%
-4°F ~ 77°F (-20°C ~ +25°C ) 1year 80%
●In case of contacting the materials from the battery:
Skin Contact : Washing immediately with water and soap.
Eye Contact : Washing immediately with plenty of water for at least
15 minutes.
Get medical attention.
Ingestion : Get medical attention immediately.
Warning:
●When the battery has rust, bad smell or something abnormal at first-time-
using, do
not use and contact your dealer.
●
The battery is requested to be stored within a proper temperature range specified
in this specification.
●Do not disassemble or reconstruct battery.
●Do not give battery impact or fling it.
●Do not immerse the battery in water or sea water, or get it wet.
●Do use the specified charger and observe charging requirement.
●Do not continue to charge battery over specified time.
●Do not charge the battery near a fire or in a hot vehicle or direct sunlight.
●Do not use the battery with conspicuous damage or deformation.
●Charging temperature range is regulated between 32°F ~ 113°F(0°C ~ 45°C).
Do not charge the battery out of recommended temperature range.
Charging out of recommended range might cause the generating heat or serious
damage of battery.
And also, it might cause the deterioration of battery's characteristics and cycle life.
●Do not use or leave batter nearby fire, stove or heated place.
The battery may generate heat, smoke or flame.
And also, it might cause the deterioration of battery’s characteristics or cycle life.
●Avoid discharging the battery completely, it can
damage the performance of the
battery.

4-3.Charging the Lithium Battery
The detector will automatically turn off if the battery capacity is too low, charging it
when the LOW-BATT LED is lit.
It is highly recommended not to use the detector during charging, the battery may be
heated and dangerous.
The CHARGING LED be lit red color during charging, it will turn to green when
charging is completed.
Note: Always charge within the charging environment specifications of 32°F~113°F
(0°C~45°C), less than 80% RH.
The lithium battery is charged with AC power via AC adapter and USB cable:
(AC adapter/charger is not include)
1.
Use the AC adapter and plug mini B male into the mini B receptacle of the unit
(Fig. 1).
2. Plug the AC adapter to the wall jack (Fig. 2).
3.
Use the USB cable plug mini B receptacle of the unit and plug A male into PC or
Notebook USB port (Fig. 3).