DT930 Intrinsically Safe Dose Control Unit

Product features

  • Measuring of dosed material quantities / rest material quantity still to be dosed / total dosed material quantity
  • Measuring of material flow
  • NAMUR / contact inputs
  • 2 valve-controller, 1 pump-controller
  • Automatic batch correction
  • Remote operation with external push buttons
  • TTY serial interface
  • Large, 25 mm 4 digit or 17.8 mm 6 digit LCD display
  • Intrinsically safe design
  • Enclosure with IP 65 protection; suitable

Product description

With help of impulse output flow-through detector connected to its input, the DT930 Dose Control Unit is suitable for accurate batching of fluids. The fluid quantity needing to be batched can be adjusted by means of tastature located on the front panel or, in remote controlled operating mode, through the communication interface.
The equipment has two valve regulating outputs and one pump regulating output, with help of which it is capable of performing many kinds of batching operational mode. On its large-sized display it indicates the material flowing rate, as well as the quantity of batched material, residual material and total batched material.
It may have an analogue output of 4-20 mA for transmission of the material flowing rate, as well as the quantity of batched- and residual material, and/or an impulse output for transmission of the quantity of batched material.
The outputs are scaleable.
The equipment is intrinsically safe it can also be operated in an potentionally explosive areas.
On account of its case with protection ratio of IP 65 it can be installed near by the field of process, or it can be installed as panelinstrument.

Operations

Remote operation with outer push buttons

The push buttons for start (START), stop (STOP) and reload (RCL) can be led through and also be installed farther from the equipment, consequently the equipment can be protected against possible rough impact and push buttons can be placed at the most appropriate location for the operator.

DT930 intrinsically safe dose control unit figure 1

 

Installation, remote operation with communication

The DT930 Dose Control Units can be connected to PLC, process control computer, via serial interface. The interface are galvanically isolated and suitable for bus system connecting of more equipment. The communication protocol Modbus provides an effective information exchange between the DT930 and the computer, PLC. Batching parameters can be downloaded, the batching process can be started and stopped, furthermore measuring results and error messages can be queried. The equipment knows both the protocol Modbus RTU and the protocol Modbus ASCII. A programme, running on PC, for testing the communication is provided by the manufacturer.

DT930 intrinsically safe dose control unit figure 2

 

Measuring flow rate, as well as the quantity of batched material, residual material and total batched material

The push buttons for start (START), stop (STOP) and reload (RCL) can be led through and also be installed farther from the equipment, consequently the equipment can be protected against possible rough impact and push buttons can be placed at the most appropriate location for the operator.

DT930 intrinsically safe dose control unit figure 3

 

2 valve regulating- and 1 pump regulating output, fine batching, automatic batch correction

Depending on the batching task and conditions the equipment DT930 can be applied in several ways.
One- or two valve operating method, pump controlled- or without pump operating method.
During two-valve operating method quick and accurate batching can be performed: the valve with high delivery value closes before the end of batching and the batching process is completed through the valve with low delivery value.
After stopping the batching the automatic batching correction measures the difference between the batch adjusted and the batch measured, and corrects it during the next batching.
The DT930 has a valve protection if during batching process the material flow is stopped due to any cause, then this protection suspends batching, closes valves and switches the pump off. After trouble shooting the batching can be
completed.

 

Flow-through detectors

Almost all of flow-through detectors having impulse output can be connected to the input of DT930:

  • contact
  • NAMUR (line fault- and line break detection).

The parameter of the flow-through detector (impulse / quantity) and the time dimension of the flow rate (sec., min., h) can be adjusted on the equipment.

Technical specifications

Intrinsical safety data:
Certification:BKI 15 ATEX 0036 X
Protection marking: II 2G Ex ia IIC T4 Gb (-20 °C < Ta < +60 °C)
Safety data pertaining to intrinsical safety:
Uo [V]Io [mA]Po [mW]Co [uF]Lo [mH]Ui [V]Ii [mA]Pi [W]Ci [uF]Li [mH]
Power supply:----------22.4912.100,73
NAMUR input:8.618.7237.55100----------
Digital outputs:51.351.60030350.200
Analogue outputs:8.6149.7107510----------
Outer push-buttons:55.26.45100----------
TTY serial interface:----------26700.3800
Input parameters:
Digital inputs:
Input:for the connection of NAMUR (DIN 19234) / contact / switching
transistor
No-load voltage / inner resistance:8.2 V / 1 kohm
Frequency range:1 mHz-500 Hz
Outer push-buttons:
Input:for the connection of outer push-buttons
No-load voltage / inner resistance:5 V / 1 kohm
Resistance of closed / open contacts:1 kohm (max.) / 150 kohm (min.)
Output parameters:
Analogue output:
Output signal:DC current
Range:4-20 mA
Overdrive:10%
Overvoltage protection:8.6 V (limiter)
Overcurrent protection:50 mA (limiter)
Error of the output signal:0.5% (max.)
Temperature-coefficient:50 ppm / OC (typically)
Supply-voltage effect:practically zero
Loading-effect:practically zero
Digital outputs:
Output:4 passive switching transistor
Load rating:30 V, 35 mA, 200 mW
Communication interface:
Interface type:TTY serial (independent intrinsically safe circuit)
Protocol:Modbus slave, RTU or ASCII, 9600 Baud (max.)
Display:
Display:4 digit, 7 segments LCD with
25 mm character height
6 digit, 7 segments LCD with
17.8 mm character height
Display range:0.000-99990.00000-999999
Accuracy:±1 digit±3 digit
Power supply:
Supply voltage:18 VDC (intrinsically safe)
Supply current:70 mA
Consumption:1.4 W (max.)
Ambient conditions:
Operating temperature range:-20...+60°C
Relative humidity:90% (max., non-condensing)
Place of installation:potentially explosive area
Electromagnetic compatibility (EMC)
accordance with the standard EN 61326-1
Immunity:industrial area
Noise emission:Group 1, Class B
General data:
Housing:polycarbonate box; it is installable also as a panel-instrument
Connection:IP 65 cable entry
Connection cable:0.25-1.5 mm2
Dimensions:167 × 87 × 95 mm (width × height × depth)
Weight:0.8 kg
Protection:IP 65
Detailed information see in operating instructions. The Manufacturer maintans the right to change the technical data!

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Leaflet of productATEX certificate

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