DTT31, DTT35
4 Endress+Hauser
• Multi Channel Recorder Ecograph T
144 x 144 mm (5.67 x 5.67 in) panel mounted housing for electronic acquisition, display, recording,
analysis, remote transmission and archiving of analog and digitalinput signals. Data recording system with
CompactFlash card and multi-coloured LCD display (120 mm / 4.7 in screen size). Configuration and
visualisation via interface (USB, Ethernet, RS232/485) and ReadWin
®
2000 PC operating software.
• Data logger Minilog B
Battery powered measured value collector with 2 input channels for storing analog and digital values.
Internal memory 128 kB for max. 84000 measured values. Configuration and visualisation via RS232
interface and ReadWin
®
2000 PC operating software. Optionally with telealarm function.
Input
Measured variable • Flow velocity of liquid media (calorimetric measuring principle)
• Temperature (RTD), optional for two switch outputs or additional analog output
Measuring range • Flow: 0.03 m/s to 3 m/s (0.1 to 9.84 ft/s), as relative value between 0 and 100%; maximum display
resolution: 1%
• Temperature: -20 °C to +85 °C (-4 to +185 °F); display resolution: 1 °C (1 °F)
Output
Output signal DC voltage version: (short-circuit proof version)
• 1x PNP switch output (flow) or
• 2x PNP switch outputs (flow or temperature, adjustable) or
• 1x PNP switch output and 1x 4 to20 mA output, active (flow or temperature, adjustable)
!
Note!
The analog output reads out the measured flow rate as relative value in percentage of the adjusted measuring
range.
Signal on alarm Signal on alarm as per NAMUR NE43
• Underranging: Linear drop to 3.8 mA
• Overranging: Linear rise to 20.5 mA
• Sensor break; sensor short-circuit:
≤ 3.6 mA or ≥ 21.0 mA (at settings ≥ 21.0 mA, 21.7 mA output is guaranteed)
• Switch outputs: at safety condition (switch open)
Load Max. (V
power supply
- 6.5 V) / 0.022 A (current output)
Range of adjustment • Switch output
Switch point (SP) and switchback point (RSP) in increments of 1% with min. hysteresis of 5%
• Damping: freely adjustable: 0 = off (no damping) or 10 to 40 s in increments of 1 second
• Unit: %, optional °C, °F (with two outputs and temperature monitoring)
Switching capacity DC voltage version:
• Switch status ON: I
a
≤ 250 mA, switch status OFF: I
a
≤ 1 mA
• Switching cycles: > 10,000,000
• Voltage drop PNP: ≤ 2 V
• Overload protection
Automatic testing of switching current; output is switched off in case of overcurrent, the switching current
is tested again every 0.5 s; max. capacitance load: 14 μF for max. supply voltage (without resistive load)
Periodic disconnection from a protective circuit in event of overcurrent (f = 2 Hz) and indication of
’Warning’
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