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Elma BM 251-252-255-257
side 46
Battery and Fuse replacement:
Loosen the screw from the access cover of the case bottom. Lift the access cover.
Replace the batteries or fuse. Re-fasten the screw.
Generel specifications
Display:
3-5/6 digits 6,000 counts
Update Rate:
5 per second nominal
24 Segments Bar graph:
40 per second max
Operating Temperature:
0
o
C to 40
o
C
Relative Humidity:
Maximum relative humidity 80% for temperature up to 31
o
C
decreasing linearly to 50% relative humidity at 40
o
C
Altitude:
Operating below 2000m
Storage Temperature:
-20
o
C ~ 60
o
C, < 80% R.H. (with battery removed)
Temperature Coefficient:
Nominal 0.15 x (specified accuracy)/
o
C @ (0
o
C ~
18
o
C or 28
o
C ~ 40
o
C), or otherwise specified
Sensing:
BM251, BM252, & BM255: Average sensing
BM257: True RMS sensing
Pollution Degree:
2
Safety:
Double insulation per IEC61010-1 2nd Ed., EN61010-1 2nd Ed., UL61010-1 2nd
Ed. & CAN/CSA C22.2 No. 61010.1-0.92 to Category II 1000V, CAT III 600V and CAT IV
300V AC & DC
Transient Protection:
6.5kV (1.2/50µs surge)
Terminals (to COM) Measurement Category:
V : Category II 1000V, CAT III 600V and CAT IV 300V AC & DC.
mAµA : Category III 500Vac and 300Vdc.
A : Category III 600Vac and 300Vdc.
46


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