S428A Digital Process Indicators (Dynapar)
Blazing bright, large, color-changing display

optional tare function available
Veeder-Root S-428 Series Process Indicators


  • Universal input capability: DC Volts, DC
  • Process, Temperature
  • Quick and easy front panel input scaling
  • Field interchangeable outputs provide
  • flexibility and minimize downtime
  • Up to 3 alarms, fully configurable for High or Low operation as well as for latching output and combinational logic
  • 4-20 mA output can be used to retransmit the process value to a strip chart recorder or PLC
  • Min & Max Value Capture provides valuable process information
  • NEMA 4/IP65 rated front panel for use in washdown environments
  • Transmitter power supply simplifies wiring
  • Universal AC power supply


The Dynapar S428A is a new digital panel indicator providing a high contrast, high visibility display, designed for optimal ease of use in a wide variety of process measurement applications. The S428A is fast, accurate and easy to read with a jumperless configuration, plug in output boards and quick and easy setup. The new generation S428AA further provides a new user-selectable dual color display option with fixed red or green displays or a green to red color change when an alarm condition occurs.

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In addition, plug-in modules allow PV retransmission or transmitter power supply and up to 5 alarm relays (latching or non-latching). The S428AA indicator is affordable, full featured, easy to use and compact with performance features that work for you to make temperature and process display simple.

The S428AA digital indicator like its predecessor, the S428A, remains an easy to use low cost solution for process display applications including temperature, pressure and force – providing excellent visibility and high accuracy all within an affordable and ultra compact housing

  • Literature
  • Specifications

Literature and Technical Information

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Panel Indicating Controllers

S428A Series

++ S428A Series,AC Indicating Controllers| Brochure (114 kB)
++ S428A Series, Manual | (118 kB)
Process Input
Display; Red/Green, 7 segment LED
Primary display: 7 segment LED, 4 digit , 0.53" (13mm)
Secondary display: single digit ,0.39" (10mm)
Annunciators: LED indicators for output andstatus
Front Panel Rating: IEC IP66 (NEMA 4X) front panel
IEC IP20 (behind the panel protection)
T/C’s: J, T, K, L, N, B, R, S, C; Pt Rh20% vs. Pt 40% Rh
RTD: 3-wire, PT100
DC Linear (Scalable –1999 to +9999)
Volts: 0-5V, 1-5V, 0-10V, 2-10V
DC milliamps: 0-20mA or 4-20mA
DC millivolts: 0-50mV, 10-50mV
All outputs are user-selectable and customized based on desired application; choose from the following output types
Max # of Outputs: 5 for alarm, 24 VDC transmitter power supply or retransmit of process value
Single Alarm Relay: Optional SPDT; 240VAC 2A resistive; Lifetime >500,000 operations at rated voltage/current
Dual Alarm Relays: Optional, Two x SPST contacts with shared common. 2 Amp resistive at 240V AC, >200,000 operations. Latching or non-latching
SSR Drive: Optional drive capability: >10 VDC nominal into 500 ohm minimum
DC Linear: Optional 0-20mA, 4-20mA into 500 ohm max;
0-10V, 1-5V, 2-10V, 0-5V into 500 ohm min;
Outputs have 2% over/under drive applied;
Accuracy +-0.25% (mA into 250 ohm load, V into 2k ohm load); degrading linearity to +-0.5% for increasing burden to specified limits
Triac: Optional 0.01 to 1A AC, 20 to 280Vrms, 47-63 Hz (Limit 2)
Transmitter Power Supply: Optional 24 VDC (Limit 1)
Output Functions
Process Alarm: (reverse or direct)
Alarm Modes (Alarm 1 through 5): High/Low, logical OR
Retransmit: Process value
Electrical Performance
Input sample rate: 4 per second, 14 bit resolution
Accuracy: ± 0.1% of input range ±1 LSD (T/C CJC better than 1 degree C)
Sample Rate: >10M ohm for the thermocouple and mV ranges, 47k ohm for V ranges and 5 ohm for mA ranges
Sensor Break Detection: <2 seconds (except zero based DC ranges), high alarms activate for T/C, RTD and mV ranges, low alarms activate for mA or V ranges
Sensor Break: Detected within 2 seconds
Communication: 2-wire, RS-485 serial communications option with choice of Modbus RTU or Dynapar ASCII protocol; 1200 to 19200 baud
Supply Voltage: 100-240V, 50/60Hz,
Optional 20-48VAC 50/60Hz / 22-65VDC
Power Consumption: Voltage: 20-28 VDC, 24 VDC nominal;
Min. Impedance: 910Ω (22 mA @ 20 VDC)
Operating Temp.: 32° to 131°F (0° to 55°C)
Storage Temp. -4° to 176°F (-20° to 80°C)
Relative Humidity: 20% to 95% non-condensing RH
Case Material: GE Lexan 940
Approvals: CE, UR, cUR UL File # 67237
Safety: EN61010
EMC: EN61326
Terminals: Screw type terminals – combination head
Weight: 0.46 lbs (0.21 kg)
Mounting: Panel mount (mounting bracket supplied), 45mm x 92mm cutout
Dimensions: 48mm x 96mm, 100mm deep