MSA DF-8500, User Manual

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DF-8500 Gas Detector
Note
：
1) The energized/de-energized and self-locking/non-self-locking
settings of high and low alarm relays cannot be set separately.
2) The alarm delay is only effective for low alarm relays. In addition,
in the low alarm delay period, if the high alarm is triggered, the low
alarm delay will end immediately, and trigger the low alarm at the
same time.
The Fault relay state in non-fault operating condition is Energized and
terminal connections are supplied for Normally Closed and Normally
Open.
The energized fault relay setting provides an electrical path for fail-safe
relay operation. In the event of an y failure, including loss of power, the
relay will change to the de-energized state to indicate a fault condition.
The Fault relay state cannot be reconfigured.
[M-11] -- Relay Testing
This menu is used to test the relay operation of the detector, so th at it is convenient
to conduct field linkage testing.
(1) Press “+” to select the menu item M-11.
(2) Press “ON” and the screen will display the menu for entering password.
(3) Enter the password (see Section 4.4).
(4) If the password is correct, then the device enters th e next level menu of M-
11, and the screen displays “OFF”. If you press “+”, the relay status will inverse, i.e.
the original closed relay disconnects while the original disconnected relay closes. If
you continue to press “+”, the relay status will continu e to inverse. Press “ON” or
“OFF” after you have finished the testing, then the relay will return back to the
original status and back to menu M-11.
[M-13] -- Manual zero calibration
This menu is used to manually calibrate the zero point. Note: Please use M-01 to
perform automatic zero calibration as far as possible. Manual zero calibration
through M-13 shall only be performed when automatic zero point calibration cannot
be completed through M-01 when unstable gas flow is caused by strong wind or
other factors at the site.
(1) Press “+” select the menu item M-13.
(2) Press “ON” and the screen will display the menu for entering password.
(3) Enter the password (see Section 4.4).
(4) If the password is c orrect, you will enter the next level of submenu M -13. At this
time, a flashing “0” will appear in the display, which indicates that manual zero
calibration is ready. Press “OFF” to cancel the manual zero calibration and return to
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