7ML19985FM01 MFA 4p - INSTRUCTION MANUAL Page 29
c.To find out if the probe is defective (non-IMA type only; i.e. MSP-1 , MSP-3, and
MSP-9 ):
i. Disconnect probe from pre-amp.
ii. Connect an ohmmeter across the black and white leads.
iii. Nominal probe impedances are as follows
If impedance deviates substantially from these values, an open or short circuit condition
is indicated.
Maintenance
The Motion Failure Alarm MFA 4p requires no maintenance: however, we recommend a
program of periodic checks.
If it is necessary to clean the enclosure and circuit boards:
1. First, make sure the power is disconnected at the main breaker.
2. Use a vacuum cleaner and a clean, dry paint brush.
3. Check all electrical contacts for corrosion and arcing.
It is a good idea to periodically check the face of the probe: it should be free of material
build-up, corrosion or deformation.
MSP-1 115 ohms
MSP- 3 and MSP- 9 750 ohms
7ML19985FM01.book Page 29 Wednesday, May 21, 2008 2:17 PM
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