1290 Strain Gage Input Indicator 5
1. INDICATOR DESCRIPTION
The Dynisco Model 1290 Strain Gauge Input Indicator is a flexible, programmable indicator
designed for 350 ohm strain gauge based sensors, such as pressure transducers and load cells. The
five digit, 0.52” LED display provides a precise, readable indication of the measured value.
You can program the 1290 to display in engineering units up to a full scale value (fsv) of 99,900
with an accuracy of ± 0.1%. The span value, alarm set points and other constants are stored
indefinitely in non-volatile memory. Easy-to-remember pushbutton sequences simplify transducer
calibration routines.
Two independent SPST alarm relays are another available feature of the 1290. The dual high or low
set points are easily programmed from the front keyboard and are displayed on the digital display.
The low alarms can be set up as low-alarm-masked to inhibit alarm action during startup. Relay
contacts are provided to activate an annunciator or to initiate automatic shutdown if operating
conditions exceed preset limits.
A programmable voltage or current retransmission output is available as an option. You can select a
voltage output of 0-10 VDC or current outputs of 4-20 mA or 0-20 mA to drive chart recorders or
data acquisition equipment
The Model 1290 can also be supplied with bidirectional and half duplex RS-485 serial
communications. All signals are optically isolated and the baud rate is adjustable between 150
19200 baud. The serial communications and analog retransmission output options are mutually
exclusive.
Other features of the 1290 are:
•A peak reading display (high and low) selected from the front panel
•A digital filter to reduce the effects of input variations on the display, analog output and alarms
• Input interruption sensing to detect when a transducer or any one of its leads has been
disconnected
•A program lockout feature that disables the front keyboard to prevent un authorized or
accidental changes
• An input signal that can be configured for either resetting the alarms or triggering hold-on-value
•A digital display that provides operator prompts with messages to show current status or errors
•A compact, 48mm by 96mm (1.89in. x 3.78 in.), 1/8 DIN enclosure that projects only 144mm
(5.67 in.) behind the panel
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