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DIS978
STRAIN GAUGE (BRIDGE) INPUT
PROCESS INDICATORS
FEATURES
 | Provides 4 1/2 Digit Display, Red or Green LEDs |
| Display Calibrated in Engineering Units (psi, kg, klb, etc.) Proportional to a Strain Gauge Bridge Input |
| 0.5 mV/V to 1 V/V Input Span |
| Fully Isolated Output and/or 0, 1, or 2 Alarms (Optional) |
| Alarm Setpoints Adjustable Without Disturbing Transmitter Output |
| Fail-safe Alarm Operation |
| LED Alarm Status Indicator |
| Adjustable Deadband |
| Unlimited* Choice of Input/Output Ranges |
| Fits Standard 1/8 DIN Cutout |
| Rated NEMA-4X, Waterproof and Corrosion Resistant When Properly Installed |
| 5 + 5 Year Warranty |
DESCRIPTION
The DlS978 provides a display, optional isolated DC output voltage or
current proportional to the output of a strain gauge bridge, and optional alarm
setpoints. The units include filtering and conditioning to reduce susceptibility
to transients and noisy operations as well as a well regulated excitation
voltage for the strain gauge and a high quality differential preamplifier to
condition the low level output from the bridge. The digital display
utilizes an auto-zero dual-slope integrating A/D converter for accuracy and
stability.
All controls are accessible by removing a gasketed front access panel. The
display controls are wide ranging so that they can be calibrated to display
engineering units. Decimal point selection is made with a switch, also
accessible from the front. A complete set of engineering unit labels is sent
with each DIS. Once the display has been adjusted to read the correct
engineering units, the alarm setpoints can be adjusted without test equipment
and without disturbing the output voltage or current.
Either setpoint may be displayed by use of the SP CAL switch. Each
setpoint has a red LED to indicate alarm status. The alarms have adjustable
deadbands. Terminations are made to a screw terminal connector on the rear of
the case.
TYPICAL APPLICATIONS
Weight and pressure indication, control, monitoring, data acquisition and
warning.
MOUNTING
The DIS is designed to be mounted from the front of a panel through a standard
horizontal 3.62 x 1.77 inches (1/8 DIN) cutout. Two mounting camscrews secure
the DIS to the panel.
SPECIFICATIONS
INPUT SPAN
0.5 mV/V to 1 V/V
IINPUT IMPEDANCE
200 kilohms
EXCITATION
fixed 10 V
40 mA max
load
EXCITATION STABILITY
±0.005%/°C
OUTPUT RANGE
Voltage
select any range
between ±10 V
10 mA max
load
(min span 0.2
V)
Current
select any range from 0
to 20 mA max
24 V compliance**
(min span 1
mA)
RELAY CONTACTS
(spdt)
Resistive Load:
5 A max, 150 W max,
240
VAC max, 30 VDC max
Inductive Load:
1/8 HP max at 120/240 VAC
SETPOINT
each alarm 0 to 100% of span
DEADBAND
0.25% to 100% of
span
RESPONSE TIME
1 sec
typical
ISOLATION
Output/Input
>500 megohms
Breakdown
Voltage
>600 VAC rms
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DISPLAY
Digit Size
.56 inch LED, 4 1/2 digits, ±19999
Decimal Point
±1.9.9.9.9
Control Range
Zero
±19999
Span
min span 10
max span 20000
Display Update
3/sec
ACCURACY
±0.1% of span
LINEARITY
Display
±0.01% of
span
Output
±0.025% of
span
OUTPUT RIPPLE
<0.1% of
span
(peak to
peak)
COMMON MODE REJECTION
120 dB, DC to 60 Hz
OPERATING TEMPERATURE
14°F to 140°F
-10°C to 60°C
TEMPERATURE STABILITY
±(0.02% of span +30 µV)/°C max
POWER
115 VAC ±10%, 50/60 Hz
(4 W max)
230 VAC ±10%, 50/60 Hz
(4 W max) |
* Within specified range limits.
** Compliance: The sum of the voltage drops
in the output loop cannot exceed 24 V at rated current
(1200 ohms at 20 mA).
TERMINAL CONNECTIONS
Output - (Optional)
Output + (Optional)
Excitation
+
Excitation
-
Input Signal +
Input Signal -
Alarm 1 NC (Optional)
Alarm 1 C (Optional)
Alarm 1 NO (Optional)
Alarm 2 NC (Optional)
Alarm 2 C (Optional)
Alarm 2 NO (Optional)
Power AC L1
Power AC L2
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(Terminals
Labeled)
1
2
3
4
5
6
7
8
9
10
11
12
13
14 |
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