255-250-DNDN-UL YOKOGAWA, 255-250-DNDN-UL Datasheet - Page 13

• Manufacturer Part Number: 255-250-DNDN-UL
• Description: FREQUENCY PANEL METER MODEL 255-2 55-65HZ 240VAC UL
• Manufacturer: YOKOGAWA

Specifications of 255-250-DNDN-UL

• Meter Range: 55Hz To 65Hz
• Meter Size/dimensions: 2.5" X 2.5"
• Scale Length: 2.06"
• Meter Function: Frequency

S
C
A
L
E
O
N
L
Y
AC Ammeters
Specifications
Accuracy: All DC and AC iron-vane; ±2%
of full-scale, AC rectifier type; ±3%
of full scale (with 60 Hz sine wave at 25º C).
When standard 60 Hz iron vane ammeters
are used at the extreme limits of 20 or 400
Hz, additional error (approx. .75%) may be
experienced. Expanded-scale voltmeters;
±.5% of full scale value.
AC AMMETERS — TRANSFORMER-RATED, 0-5 AMPERES, 25-500 Hz, PIVOT AND JEWEL, IRON VANE
Rating
& Scale
100 Amp
150 Amp
200 Amp
300 Amp
400 Amp
500 Amp
600 Amp
800 Amp
10 Amp
15 Amp
20 Amp
30 Amp
40 Amp
50 Amp
75 Amp
80 Amp
Size
1 Kiloamp
1.2 Kiloamp
1.5 Kiloamp
2.0 Kiloamp
3.0 Kiloamp
Type
Type 251 and 255
Horizon Line
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1
1
⁄
2
Cont’d
Horizon Line
250 240 LSMT
250 240 LSND
250 240 LSNG
250 240 LSNL
250 240 LSNP
250 240 LSNT
250 240 LSPB
250 240 LSPD
250 240 LSPK
250 240 LSPZ
250 240 LSRL
250 240 LSRX
250 240 LSSC
250 240 LSSF
250 240 LSSJ
250 240 LSSN
250 240 LSVA
250 240 LSVB
250 240 LSVC
250 240 LSVE
250 240 LSVJ
ANSI Specification: All meters meet ANSI
Specifications C-39.1.
Overload: Voltmeters (AC and DC) - 50%
momentary, 20% sustained. Ammeters
(AC and DC) momentary: 10 times the
rated current for 10 consecutive intervals
of .5 second with a 1 minute interval
between successive applications; sustained:
20% for six hours.
Scale Data: 90 degree rotation.
Scale Length:
Size
1
2
3
4
Insulation Level: All meters (except 1
2600 V
Burden Data: AC ammeter-5 amps, 0.5 va
max. 0.5 power-factor lagging, @60 Hz. AC
Voltmeter-unity power factor.
Response Time and Overshoot:
Response time: 3 seconds (max.) for 2
Series
1
1
1
1
2
⁄
⁄
⁄
⁄
2
2
2
2
200
"
"
"
"
1
⁄
2
RMS
Hi-pot, 1
1
⁄
2
"-1500 V
RMS
Horizon Line
Hi-pot.
1.50"
2.06"
2.88"
3.93"
250 340 LSMT
250 340 LSND
250 340 LSNG
250 340 LSNL
250 340 LSNP
250 340 LSNT
250 340 LSPB
250 340 LSPD
250 340 LSPK
250 340 LSPZ
250 340 LSRL
250 340 LSRX
250 340 LSSC
250 340 LSSF
250 340 LSSJ
250 340 LSSN
250 340 LSVA
250 340 LSVB
250 340 LSVC
250 340 LSVE
250 340 LSVJ
1
⁄
2
1
Series
⁄
"),
2
3
",
200
1
⁄
2
3
seconds (max.) for all other DC ratings,
and 2.5 seconds (max.) for AC ratings.
Maximum of 40% overshoot.
Dimensions: See page 36-37.
How To Order
To Order Horizon Line panel meters use
the appropriate catalog numbers provided
in the tables. Taut band instruments have
a 251 prefix number, Pivot & jewel instruments
have a 255 prefix number, except AC Iron Vane
prefix which is 251.
Ordering Examples:
1. 21⁄2", 300 V DC Voltmeter, zero left, taut
2. 21⁄2", 300 V DC Voltmeter, zero left,
3. 21⁄2", 300 VAC (Iron Vane) pivot & jewel -
Severe-duty meters are available to meet UL
1437 requirements. UL version, with flame
retardant window and base, is not offered in
11⁄2". To order, add /UL or /CUL after catalog
number, or contact factory. For ratings and
scales not listed contact factory.
1
⁄
2
", 4
band - 251 220 RXRX
pivot & jewel - 255 220 RXRX
251 244 RXRX
1
⁄
2
" size for microammeters: 2
250 440 LSMT
250 440 LSND
250 440 LSNG
250 440 LSNL
250 440 LSNP
250 440 LSNT
250 440 LSPB
250 440 LSPD
250 440 LSPK
250 440 LSPZ
250 440 LSRL
250 440 LSRX
250 440 LSSC
250 440 LSSF
250 440 LSSJ
250 440 LSSN
250 440 LSVA
250 440 LSVB
250 440 LSVC
250 440 LSVE
250 440 LSVJ
Series
4
200
1
⁄
2
7