Biosystems EX CHEK Reference Manual - Chapter 6. Trouble Shooting
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instrument is in operation. This periodic
beep serves as a reminder that the
instrument is on.
Use the following procedure to turn the
security beep on:
(1) Make sure the Ex Chek detector is in
Technician mode (as discussed in
Section 2.2.4) then turn the instrument
off.
(2) Turn the instrument on while pressing
and holding down the “-” button.
(3) The Ex Chek LCD will display alternating
“SEC” and “BEEP” messages for 4
seconds. The display will then alternate
between the current security beep
interval in minutes and the message
“MIN”.
(4) Use the “+” and “-” buttons to set the
security beep interval (the time between
beeps).
The interval may be set in one-minute
increments to any value between 0 and
60 minutes. Setting the interval to 0
disables the security beep.
(5) Once the proper setting has been
selected, press and hold down the
“Alarm” button for three seconds. Do not
release the “Alarm” button until the LCD
displays the message “DONE” to
indicate that the new setting has been
successfully entered.
Pressing the MODE button at any time
cancels the procedure. The LCD will
show the message “NO SAVE” to
indicate that the setting has not been
changed.
Chapter 6. Trouble Shooting
and Repair
6.1
Replacing Ex Chek sensor
The Ex Chek must be
calibrated immediately following any
sensor change. Failure to calibrate the
Ex Chek after a sensor change may lead
to inaccurate and potentially dangerous
readings.
To replace a sensor:
(1) Make sure the Ex Chek is turned off.
(2) Gently unscrew (1/4 turn counter
clockwise) and remove the protective
sensor cap.
(3) Remove the o-ring around the sensor
then, gently pry the sensor out of its
socket.
(4) Make sure the pins are properly aligned
and gently press the replacement sensor
into place and realign and seat the o-ring
around the sensor.
(5) Make sure the correct filter in the
protective sensor cap is replaced along
with the new sensor. (A spare filter
should have been supplied together with
the replacement sensor.) Use a blunt
object to push the old filter out of the
sensor cap, and using a finger, press the
new filter into place. Be careful not to rip
the filter membrane.
(6) Replace the protective sensor cap.
(7) Allow at least three minutes for the
sensor to stabilize.
(8) Recalibrate the new sensor.
6.2
Troubleshooting
There are a few troubleshooting and repair
procedures besides sensor and battery
replacement which can be done in the field.
Caution: The following repair procedures
should only be performed by authorized
personnel.