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Summary of Contents for biosystems EX CHEK
- Page 1 Reference Manual Ex Chek NiMH Rechargeable Version Combustible Gas Detector 651 South Main Street Middletown, CT 06457 (800) 711-6776 (860) 344-1079 Fax (860) 344-1068 Part number 13-123 Version 2.2...
- Page 3 EX CHEK PERSONAL PORTABLE GAS DETECTORS HAVE BEEN DESIGNED DETECTION MEASUREMENT POTENTIALLY HAZARDOUS ATMOSPHERIC CONDITIONS IN ORDER TO ASSURE THAT THE USER IS PROPERLY WARNED OF POTENTIALLY DANGEROUS ATMOSPHERIC CONDITIONS, ESSENTIAL THAT THE INSTRUCTIONS IN THIS REFERENCE MANUAL BE READ, FULLY UNDERSTOOD, AND FOLLOWED.
- Page 4 Low battery voltage alarms..................14 2.3.2 Battery charging procedure ..................14 Methods of sampling....................... 14 2.4.1 Using the hand aspirated sample draw kit..............14 Combustible gas sensor ....................15 2.5.1 Detection of missing or damaged Ex Chek sensor ........... 15...
- Page 5 26 Returning your Ex Chek to Biosystems for service or repair .......... 27 Appendicies ..........................28 Appendix A: How to calibrate your Ex Chek in contaminated air ..........28 Appendix B: Biosystems Standard Warranty Gas Detection Products ........29...
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Page 6: Certifications
Ex Chek is designed to detect combustible gas. The Ex Chek is Classified by Underwriters Laboratories, Inc. as to Intrinsic Safety for use in Hazardous Locations Class I, Division I, Groups A, B, C, and D, Class II Groups, E, F, & G, and the Canadian Standards Association for use in Hazardous Locations Class l Division I Groups A, B, C, and D. -
Page 7: Warnings
Do not reset the calibration gas concentration setpoints in the Ex Chek unless the concentrations of your calibration gas differ from the concentrations of the calibration gas that is normally supplied by Biosystems for use in calibrating the Ex Chek. -
Page 9: Chapter 1. Ex Chek Description
A voltage is It is also possible to use the Ex Chek to applied across the active and reference sample remote locations with the hand- elements, causing them to heat. -
Page 10: One Button Auto Calibration
The Calibration is a two step procedure. In the alarms must then be manually reset by first step the Ex Chek is taken to an area pressing the MODE button. where the atmosphere is fresh and a "zero"... -
Page 11: Low Battery Alarms
4.1. • calibration gas concentration settings 1.6.2 Low battery alarms • alarm settings The rechargeable version of the EX Chek is Chapter 5 describes how to use these equipped with a sealed rechargeable NiMH advanced technical features and setup (nickel metal hydride) battery that is choices in greater detail. -
Page 12: Weather Cover
Accurate metal plated ABS / polycarbonate electrochemical sensor material. Figure 1.3: Ex Chek external features (2) LCD display: A top mounted liquid crystal display (LCD) displays readings, messages, and other information. A manually activated backlight ensures that the LCD may be easily read even in Belt clip dim light conditions. -
Page 13: Chapter 2. Basic Operation
The Ex Chek offers a choice of two modes been restored, and the instrument is of operation, "Text Only," and "Technician". once again fit for use... -
Page 14: Turning The Ex Chek On
2.1.2 Turning the Ex Chek on The black switch on the front of the Ex Chek This screen is followed by the current gas is called the "MODE" button and is used to readings screen for the gas being turn the Ex Chek on and off, and to control measured, which alternates with a screen routine instrument operations. -
Page 15: Technician Mode
Regardless of mode selection, anytime the 2.2.2 Technician mode Ex Chek is in use it remembers the peak The "Technician" mode of operation gives readings of the gas being measured and will the user access to the numerical current gas go into alarm whenever appropriate. -
Page 16: Low Battery Voltage Alarms
CAUTION To achieve optimal charge and hours of continuous use. The NiMH battery ensure long battery life of the NIMH is sealed in the Ex Chek and should not be battery, make sure that charging takes disassembled in the field. -
Page 17: Combustible Gas Sensor
(at least 10 percent by Verification of accuracy is a two step volume) in order to detect accurately. A procedure. In the first step the Ex Chek is combustible sensor located in a 100 percent taken to an area where the atmosphere is pure combustible gas or vapor environment fresh and the readings are checked. -
Page 18: Effects Of Contaminants On Combustible Sensors
Fresh air calibration also damage the sensor. adjustments may only be made when the Ex Chek is located in air that is known to Note: If sensitivity of the combustible be fresh. After a combustible sensor sensor is lost due to poisoning, it tends alarm-latch condition occurs, the to be lost first with regards to methane. -
Page 19: Fresh Air "Zero" Calibration
A simple functional (bump) test is all that is Auto-calibration is a two step procedure. In needed to verify accuracy. the first step the Ex Chek is taken to an area To perform a functional (bump) test, turn the where the atmosphere is fresh and a "zero"... -
Page 20: Fresh Air "Zero" Auto-Calibration Sequence
Low” for zero adjust being operated in the “Text Only” mode. To reduce the chances of the Ex Chek being It will be necessary to change to the inadvertently zeroed in contaminated air, Technician operating mode. Switch... -
Page 21: Manual Calibration Procedure
Manual calibration procedure cylinder seating surfaces and threads are clean and dry before attaching the It is also possible to calibrate the Ex Chek regulator to the cylinder of gas. manually using the four buttons on the Introduction of contaminants through the instrument keypad. -
Page 22: Span Calibration Using Keypad Buttons
S A V E (7) Attach the cylinder of gas, regulator, (9) After completion of the zero adjustment short section of tubing and calibration the Ex Chek automatically returns to the adapter to the Ex Chek. gas readings screen. Make sure the... - Page 23 (9) Make sure the correct cylinder of gas is SAVE” after which the instrument will turn attached before attempting to adjust the itself off. span! If the concentration of gas reaching the sensor is too low to allow ↑↓ the instrument to be adjusted, or if the S A V E wrong type of gas is applied to the sensor being adjusted, the alarms will be...
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Page 24: Chapter 4. Alarm Settings
↓ alarm set point, the alarm ceases. It is also A L R M possible to set Ex Chek alarms so that they ↓ "latch" once they are activated. In the latched condition, once an alarm occurs both visual and audible alarms continue to (6) Use the "+"... -
Page 25: Restoring The Factory Default Alarm Settings
Restoring the factory default reading screen. alarm settings Ex Chek alarm settings are set at the factory in the most conservative way possible. It is possible to restore these default settings at any time by doing the following. -
Page 26: Chapter 5. Ex Chek Advanced Functions
Ex Chek users. calibration gas concentration: The four mini-push-buttons located under (1) Make sure the Ex Chek detector is in the the keypad cover on the bottom of the Technician mode (as discussed in detector are used to program advanced Ex Section 2.2.4) then turn the instrument... -
Page 27: Chapter 6. Trouble Shooting And Repair
Use the following procedure to turn the Replacing Ex Chek sensor security beep on: The Ex Chek must be (1) Make sure the Ex Chek detector is in calibrated immediately following any Technician mode (as discussed in sensor change. Failure to calibrate the Section 2.2.4) then turn the instrument... -
Page 28: Specific Problems
Specific problems instrument back on. If the instrument still fails to turn on, return to factory for repair. 6.3.1 Unit will not turn on 6.3.5 No audible alarm Possible causes: Possible causes: Battery discharged, microprocessor / Loose connection, alarm failure. software malfunction. -
Page 29: Returning Your Ex Chek To Biosystems For Service Or Repair
Proper tracking helps avoid unnecessary delays in completion of service procedures. Please contact the Biosystems Service Department at (860) 344-1079 if you require any additional information. Thank you for choosing the Ex Chek, and thank you for choosing Biosystems. -
Page 30: Appendicies
Biosystems Appendix A: How to calibrate your calibration materials when calibrating their Ex Chek. Ex Chek in contaminated air Calibration of the Ex Chek is a two-step Part Calibration Comments process. The first step is to expose the... -
Page 31: Appendix B: Biosystems Standard Warranty Gas Detection Products
This warranty is expressly in lieu of any and all other warranties and representations, express or implied, including but not limited to, the warranty of fitness for a particular purpose. Biosystems will not be liable for loss or damage of any kind connected to the use of its products or failure of its products to function or operate properly.
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