Indicator STR551 is designed to acquire and re-transmit process signals. The analogue input can be configured by parameter for a wide range of temperature sensors and process signals in mA and Volts. The monochromatic OLED graphic display supports graphs showing process trend with programmable sampling times and bar graphs with alarm thresholds for level, flow and dosage visualization.
The linearization of input can be customized up to 16 points as required on tanks with irregular profile. Mathematical functions linked to process value are also available, such as Totalizer and Sum. Connectivity is guaranteed by RS485 with Modbus RTU/Slave protocol.
For maximum flexibility of use, it is also possible to choose between horizontal or vertical installation.
Distinctive feature of the entire STR series is the innovative multilingual interface, with text menus allowing intuitive and quick navigation of parameters and display pages. It is possible to choose among five languages and the comprehensive menu considerably reduces the need to consult technical manual for initial set-up.
1 analogue input + 2 relays 2A + 1 Out 0..10V + 1 Out 0/4..20mA + RS485 Modbus RTU /Slave
96x48 (Front panel) x 48 mm (1/8Din)
24...230VAC/DC ±10% 50/60 Hz (galvanic isolation 2500V)
OLed (monochromatic yellow)
Temperature 0-45 °C, humidity 35..95 RH% (non condensing)
Box: Polycarbonate V0
Front panel: IP54 (IP65 with gasket) - Box and Terminal blocks:IP20
Quick set-up options
Software LABSOFTVIEW and/or Memorycard
extractable terminal blocks, spring lock
Res.16 bit, Selectable for TC type K, S, R, J, T, E, N, B (automatic compensation of the cold junction 0..50 °C, ± 0,2% F.S. ± 1 Digit F.S.), thermoresistances PT100, PT500, PT1000, Ni100, PTC1K, NTC10K (β 3435K), process signals 0-10 V(54000 points), 0/4-20mA(40000 points), 0-60 mV (16000 points), Potentiometer 6 KΩ, 150 KΩ (50000 points) Customizable linear input (max 16 steps)
PNP inputs programmable for Run / Hold / Tare-Zero / Alarms reset/ Peaks reset/ Totalizer reset / Activate-Reset Sum / Parameters-Setpoint Lock
4,1 ms (Frequency from 4,12 Hz to 242 Hz)
2A - 250VAC (resistive charge)
1 output 0...10V (60000 points) - 1 output 0/4...20mA (60000 points)
24 VDC - 30mA for external sensors supply (loop-powered)
RS485 Modbus RTU - Slave (1200...115200 Baud) galvanically isolated from Power supply/Inputs/Outputs
ON - OFF with hysteresis
Absolute / Threshold, Band with instantaneous/delayed/retentive/by digital input activation, Sensor failure / Activation by serial line
Sum different process measurements over time By digital input or by keyboard
Visualisation of instant process value and total value since last reset
Trend visualisation with selectable time basis 1 to 3600s
Process values / Setpoints
Digital transmission via RS485
Process values / Setpoint / Parameters
Semi-automatic setting of limits/ calibration values for analogue input
Measure unit visualization
Selection of different measuring units