255-250-DNDN-UL YOKOGAWA, 255-250-DNDN-UL Datasheet - Page 19

• 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

AC FREQUENCY — PIVOT AND JEWEL, SELF-CONTAINED, ACCURACY ±3 PERCENT OF SPAN; I.E.,
0.3 Hz FOR 45-55 AND 55-65, AND 1.2 Hz FOR 380-420 RANGE
Specifications
Accuracy: All DC and AC iron vane, ±2%
of fullscale, AC rectifier type; ±3% of
fullscale (with 60 Hz sine wave at 25°C).
Expanded scale voltmeters ±0.5% of fullscale.
Special order
DC with mirror back scale (DC only) 31⁄2 -
41⁄2" Available @ ±1%.
ANSI Specification: All meters meet ANSI
Specifications C-39.1 (See page 14 for
exceptions.)
AC Frequency Meters
NOTE: For non-listed voltages, up to 480 VAC, frequency ranges or special calibration (accuracy ±2% of span) contact factory. For taut-band suspension replace prefix
254 with 250 and prefix 255 with 251.
Voltage Frequency Scale
±20%
120
120
120
120
208
208
208
208
240
240
240
240
480
Center
Stylist Surface Mount
Hertz
Size
Type 260 and 264
400
400
400
50
55
60
50
55
60
50
55
60
60
Hertz
380-420
380-420
380-420
45-55
45-65
55-65
45-55
45-65
55-65
45-55
45-65
55-65
55-65
Cat. No.
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1
1
⁄
2
Stylist Series
Overload: Voltmeters (AC + DC) - 50%
momentary, 20% sustained. Ammeters
(AC +DC) momentary: 10 times the rated
current for 10 consecutive intervals of .5
seconds with 1 minute interval between
successive applications; sustained: 20%
for six hours.
Scale Data:
METER
SIZE
ARC
1
2
3
4
1
1
1
1
⁄
⁄
⁄
⁄
2
2
2
2
"
"
"
"
-
VANE
IRON
2.15"
2.70"
3.80"
Choose
90°
AC
prefix
—
254
255
Available in Horizon Line
or
Cat. No.
2
254 250 LNLN
1
or New Big Look
⁄
2
250 AGAG
250 AJAJ
250 ANAN
250 BKBK
250 GGGG
250 GJGJ
250 GNGN
250 HKHK
250 DGDG
250 DJDJ
250 DNDN
250 EKEK
TAUT BAND/
PIVOT &
JEWEL
1.66"
2.29"
2.85"
4.01"
95°
Choose
prefix
254
255
or
Cat. No.
3
Insulation Level: 2600V/1 min.
(2
1500V/1 min. (1
Response Time:
3 seconds (Max.) - Microammeters
2 seconds (Max.) - All other DC ratings
2.5 seconds (Max.) - All AC ratings
Maximum 40% overshoot
Dimensions: See page 38.
Burden Data: AC Ammeter 5 amps @ 60 Hz,
0.5VA, Max. .5 Power factor lagging, AC
voltmeter - unity power factor.
Notes:
Severe-duty meters are available to meet
/CUL or /UL 1437 requirements in 2
sizes. To order, add /UL or /CUL after catalog
number, or contact factory.
254 350 LNLN
1
⁄
1
2
"-4
⁄
2
350 AGAG
350 AJAJ
350 ANAN
350 BKBK
350 GGGG
350 GJGJ
350 GNGN
350 HKHK
350 DGDG
350 DJDJ
350 DNDN
350 EKEK
1
⁄
2
")
1
⁄
2
")
Choose
prefix
254
255
or
Cat. No.
4
254 450 LNLN
1
⁄
2
450 AGAG
450 AJAJ
450 ANAN
450 BKBK
450 GGGG
450 GJGJ
450 GNGN
450 HKHK
450 DGDG
450 DJDJ
450 DNDN
450 EKEK
1
⁄
2
"-4
1
⁄
2
"
13