<< Yokogawa
Horizon Line Panel Meters
Yokogawa Horizon Line Panel Meters
AC Microammeters and Milliammeters, Rectifier Type
|
- Extra-wide scales
- Big bold numerals above the scale
- Divisions for unobstructed reading
- Tapered needle-sharp pointers
- Shadow-free acrylic covers help pinpoint values
- Available in taut band and pivot and jewel types.
- Gasket sealer gives New Big Look dust and moisture
resistant design. (Except 1-1/2”).
|
 
Yokogawa Horizon Line Panel Meters
Shown
|
|
|
| |
These meters feature extra wide scales, big bold numerals above the
scale and divisions for unobstructed reading. Tapered needle sharp
pointers and shadow free acrylic covers help to pinpoint values. Meters
are available in taut band or pivot and jewel elements. They meet ANSI
C39.1. In addition to these features, these meters are also available to
meet UL/CSA and/or IEC specifications and can be easily modified to most
custom applications.
The Horizon Line from the Yokogawa line of panel meters can be mounted
from the front or rear of the panel. Behind the panel mounting is easy;
simply remove the snap-off mask and mount. No special mounting hardware
or bezels are required. All Horizon Line panel meters are available in a
variety of sizes and mounting configurations based on the customer
application. This built in interchangeability eliminates the need for
drawing changes and redrilling of panels. |
|
|
Dust Resistant Construction.
YOKOGAWA Horizon Line panel meters, except 1-1/2”, feature gasketed
construction to seal out dust and other air-suspended damaging
particles. Application is ideal for adverse environments. Special dust
resistant features are included on all YOKOGAWA New Big Look meters
(except 1-1/2”). For more severe applications, to meet UL-1437 or IEC
144 requirements, other models are also available upon request.
Clean, Readable Case Design Provides Extra Safety:
YOKOGAWA’s brand Horizon Line panel meters are designed
to provide attractive styling, quick, sure readability for any
application, and a built in safety feature to help you meet
national safety requirements. If you must remove the acrylic cover, you
have to remove the instrument itself from the panel in order to reach
the special safety screws holding on the cover. Removing the meter
prevents shock hazard. This safety feature is standard on all New Big
Look and Horizon Line meters.
Taut Band:
Taut band is a means of suspending the moving mechanism between two
ribbons of metal, obviating the need for pivots, jewels and control
springs found in conventional mechanisms. The absence of friction
resulting from this permits greater sensitivities and provides more
rugged meters. Common failures of conventional meters subjected to shock
testing are cracked jewels and/or blunted pivots. Taut band, without
pivot and jewels, consequently, will withstand shock in excess of that
specified for pivot and jewel meters. For example, ANSI Specifications
for panel meters require 50G shock. Taut-band meters will withstand 100G
shock.
Pivot and Jewel:
In this design the coil and pointer are supported by polished steel
pivots at each end which fit into jewel bearings. Pivot and jewel meters
are recommended for high vibration environments because of the
mechanism’s inherent stability and strength. Accuracy and repeatability
are almost equal to the taut-band’s, and good performance from the pivot
and jewel construction is the reason for its long popularity. Don’t
specify pivot and jewel meters for applications that involve high shock,
but do take advantage of this meter’s ability to withstand vibration.
High-Sensitivity DC Voltmeters:
Standard DC voltmeter sensitivity is 1000 ohms/volt. Expressed
differently, 1000 ohms/volt sensitivity means that the meter draws
approximately one milliamp full-scale current.
Occasionally lower current drains are necessary, hence higher
sensitivities may be required. The table below compares available
sensitivities, maximum self-contained voltages, and approximate
full-scale currents. The voltage range could be extended by using
external resistors.
Expanded-Scale Voltmeters:
For very close monitoring of voltages, Zener diode expanded scale
voltmeters are available in 3-1/2- and 4-1/2-inch sizes for AC and DC
ratings. Accuracy is ±0.5% of full-scale value. Standard voltage spans
are listed in “Ratings.”
Expanded scale voltmeters can be furnished for any mid-span values from
12 to 300 volts. Minimum span is 16% of mid-span value.
Frequency Effect — AC Meters:
Iron vane voltmeters are sensitive to frequency and should not be
used on frequencies other than design frequency. (Standard voltmeters
are calibrated at 60 Hertz. Used at 50 Hertz, accuracy becomes ±2-1/4%.
There are also 150- and 300-volt ratings listed which are calibrated at
400 Hertz). For calibrations at frequencies other than 60 and 400 Hertz,
refer to factory.
All Iron-vane ammeters (which produce a conventional scale distribution
with divisions crowded in lower third of scale) from 10 milliamperes to
50 amperes are virtually unaffected by a change in frequency; e.g., a
stock ammeter (calibrated at 60 Hertz) when used at 400 Hertz incurs an
additional error of only .5 percent full-scale. If used on 1000 Hertz,
the additional error is 4 percent. We recommend use of stock (60 Hertz)
ammeters on any frequency in the range of 25 Hertz to 400 Hertz. For
calibration at frequencies outside the 25-Hertz to 400-Hertz range,
refer to factory or use a rectifier-type AC ammeter.
Rectifier-Type Meters:
Rectifier-type meters differ from iron-vane mechanisms in that:
They provide a nominally linear (DC) scale rather than conventional
iron-vane distribution which has a slight crowding at low end of scale.
- AC current measurements of microamperes and milliamperes at minimum
power consumption are permitted.
AC voltmeters of higher sensitivity (ohms/volt) than iron-vane types can
be made.
- Frequency response of rectifier type meters is essentially flat from 20
to 1,000 Hertz (1% effect from reference to 60 Hertz). Rectifier-type
meters employ a full-wave rectifier and are available in ratings of
500µA to 30A.
- Suppressed-Zero DC Meters: DC meters can be mechanically suppressed up
to 20% of end-scale value. However, additional errors are introduced by
suppressions (e.g. errors at 20% suppression = ±3% of end-scale). Many
process transmitters in use today provide a 4-20mA signal (occasionally
10-50mA or 1-5mA) and require a suppressed-zero meter with operating
zero set. These are known as “live-zero” and are standard.
- Higher Accuracy: Standard calibration accuracy is ±2% of full scale. DC
meters can be calibrated to ±1% of full scale as a special model in
3-1/2” and 4-1/2” with mirrored scale.
Suppressed-Zero DC Meters:
DC meters can be mechanically suppressed up to 20% of end-scale
value. However, additional errors are introduced by suppressions (e.g.
errors at 20% suppression = ±3% of end-scale). Many process transmitters
in use today provide a 4-20mA signal (occasionally 10-50mA or 1-5mA) and
require a suppressed-zero meter with operating zero set. These are known
as “live-zero” and are standard.
Higher Accuracy:
Standard calibration accuracy is ±2% of full scale. DC meters can be
calibrated to ±1% of full scale as a special model in 3-1/2” and 4-1/2”
with mirrored scale. |
|
| |
|
Horizon Line Panel Meters - General Specifications |
|
Accuracy |
AC/DC Iron-Vane |
±2% of full-scale |
|
AC Rectifier Types |
±3% of Full scale (with 60Hz sine wave at 25°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 Voltmeters |
±0.5% of full-scale |
|
Overload |
Voltmeters (AC/DC) |
50% Momentary |
|
20% Sustained |
|
Ammeters (AC/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 |
1 1/2" |
1.50" |
|
2 1/2" |
2.06" |
|
3 1/2" |
2.88" |
|
4 1/2" |
3.93" |
|
Insulation Level |
All Meters (other then 1 1/2") |
2600 Vrms Hi-pot |
|
Response Time and Overshoot |
3 seconds (max.) for 21⁄2", 31⁄2", 41⁄2" size for
microammeters; 2 seconds (max.) for all other DC ratings, and 2.5
seconds (max) for AC ratings. Maximum of 40% overshoot. |
|
Additional Notes |
-
Pivot & jewel instruments are not available
in 1 1⁄2" size.
-
Meter with flame retardant window and base
only available in 2 1⁄2", 3 1⁄2" and 4 1⁄2" sizes. Include /CUL or /UL at the end of the catalog number or
contact factory.
-
For ratings and scales not listed contact the
factory.
|
|
|
|
|
Ordering Guide:
|
| Step 1 |
|
Specifications |
Taut Band |
Pivot and Jewel |
|
1 1/2" |
251 110 |
- |
|
2 1/2" |
251 210 |
255 210 |
|
3 1/2" |
251 310 |
255 310 |
|
4 1/2" |
251 410 |
255 410 |
|
| Step 2 |
|
Scale & Rating |
500 µA |
800 µA |
1 mA |
1.5 mA |
2 mA |
|
Code |
EMEM |
EWEW |
FAFA |
FDFD |
FGFG |
|
3 mA |
5 mA |
10 mA |
20 mA |
|
FNFN |
FXFX |
GZGZ |
HFHF |
|
|
|
|
Example Product |
| |
Scale Size and Type |
Scale & Rating |
|
Horizon Line Panel Meters, AC Microammeter/Milliammeter,
Rectifier type, 5 mA |
255 210 |
HFHF |
|
250 210 HFHF |
|
| |
|
Ordering Information |
|
Model |
Description |
Price |
|
Horizon Line Panel Meters |
Yokogawa Horizon Line Panel
Meters AC Milliammeter/ Microammeter Rectifer type
|
Please Call |
|
)
