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  • OLED Display Panel meter STR551
  • OLED Panel meter Instructions STR551
  • OLED Bar Graph Panel meter STR551

    • OLED Display
    • Universal Input
    • 4-20mA Retransmission
    • 2 Relays
    • Data Logger
    • Modbus RTU Slave

OLED Panel Meter STR551

General Description

The OLED Panel Meter STR551 is a newly designed display meter that replaced old LCD and LED technology. The OLED Panel Meter can accept signals from 4-20mA, 0-10V, Thermocouples, RTD's and provide a 4-20mA retransmission. The STR551 has a Modbus RTU optional output and up to 2 relays and 2 digital inputs.
The STR551 is a 1/8 din 48 x 96 mm panel mount instrument which can be mounted horizontally or vertically. It can display process variables, bar graphs, alphanumeric characters and with the data logger feature show the stored data in a trend view.
The STR551 Panel Meter has two analog retransmission outputs 0-10V and a 4-20mA. It has two relays that can be used for high, low, threshold, band and these alarms can be instantaneous or delayed, The relays can also be used as a sensor break alarm.
Other features built in as standard are maximum and minimum peak values, totalization and data logging, RS485 Modbus RTU.

4-20mA, 0-20mA
0-10V, 0-40mV
RTD's, Thermistor, Pot's.
2 Relays 2 Amps.
Modbus RS485.

Power Supply Voltage
24 to 230 Vac Vdc
Front panel Keyboard
LabSoft View
Memory Card
For Industrial environments
Immunity EN 61000-6-2
Emission EN 6100-6-4
Material self-extinguishing
Dimensions W x H x T
1.88 x 3.77 x 1.88" 48 X 96 X 48 mm
Weight 4 oz 165 g
Operating Temperature 32°F +113°F 0°C +45°C
Humidity (non condensing) 35-95%



Input °F °C
K Type Thermocouple -436 to 2480°F -260 to 1360°C
S Type Thermocouple -40 to 3200°F -20 to 1760°C
R Type Thermocouple -40 to 3200°F -20 to 1760°C
J Type Thermocouple -328 to 2192°F -200 to 1200°C
T Type Thermocouple -436 to 752°F -260 to 400°C
E Type Thermocouple -436 to 1832°F -260 to 1000°C
N Type Thermocouple -436 to 2336°F -260 to 1820°C
B Type Thermocouple -328 to 3308°F +80 to 1820°C
RTD PT100 -328 to 1112°F -200 to 600°C
RTD PT500 -148 to 1112°F -100 to 600°C
RTD PT1000 -148 to 1112°F -100 to 600°C
NI 100 -76 to 356°F -60 to 180°C
NTC 10K Ohm Thermistor -40 to 257°F -40 to 125°C
PTC 1K Ohm Thermistor -40 to 302°F -40 to 150°C
Voltage 0 to 10V 0-60mV
Current 0 to 20mA 4 to 20mA
Potentiometer 6 k Ohm 150 k Ohm
Output: 2 X Relays 2 A. 250 V AC
Power Supply: 24 to 230Vac/Vdc.
Power Consumption: 6VA max.
Temperature rating: Operative- 32°F +113°F -0°C +45°C
Humidity: (non condensing) 35-95%.
Housing: Polycarbonate UL94V2 self-extinguishing
Dimensions: 1.88 x 3.77 x 1.88" 48 X 96 X 48 mm .
Weight: 5.3 oz 165 g.
EMC. For industrial environments.
  Immunity: EN 61000-6-2.
  Emission: EN 61000-6-4.
Configuration: PC Configurable, Memory Card


STR551 OLED Panel Meter wiring diagram
Power supply 24-230V AC/DC
Live Terminal 5
Negative Terminal 6
Thermocouple Positive 14
Negative 13
RTD, NI Terminal 13
Terminal 14
Common 15
V and mA Negative 13
Positive 14
Thermistor 3 Terminal 15
Terminal 13
Aux Power 24 V Terminal 10
0 V Terminal 18
Digital input 1 Terminal 11
Digital input 2 Terminal 12
Retransmission 0/4-20mA
Positive Terminal 7
Negative Terminal 8
Retransmission 0-10V
Positive Terminal 9
Negative Terminal 8
Positive Terminal 16
Negative Terminal 17
Relay 1
Common Terminal 4
Normally Open Terminal 3
Relay 2
Common Terminal 2
Normally Open Terminal 1


  • Panel Meter.
  • Flow Meter and Totalizer.
  • Modbus RTU.
Back to General Description OLED Display Panel meter STR551