Laboratory Experiments > Tank System > Technical data

TS21 Tank-System

The tank system consits of a cylindrical tank and a pump which are mounted on top of a rectangular container. The pump driven by a DC motor sucks distilled water out of the container and supplies the cylindrical tank. On its base there is a manual valve as nominal outflow allowing the liquid to flow continuously back into the container. This closes the cycle. Using a second manual valve an additional opening in the cylindrical tank can be opened. The level of the liquid is measured by a process pressure transmitter. The container and the cylindrical tank build one unit and are made of plexiglass. The model and the accompanying actuator are connected by a 6-polar plug.

Physical dimensions and weight of the system:
  • Width : 565 mm
  • Height : 815 mm
  • Depth : 360 mm
  • Weight : 19 kg


  • Type : Diaphragm pump
  • Supply voltage : 12 V
  • Input current : 1.4 A
  • Maximum flow: : 7 l/min
  • Pressure : 1.4 bar


  • Range : 0 ... 100 mbar
  • Output signal : 0 ... 20 mA (two-wire)
Actuator with signal adaption unit and analog controller

Located inside a 19" housing are the power supply, the servo amplifier for the pump, the signal
adaption unit and the analog controller. An external controller can be connected alternatively
either via USB interface or 37pol. DSUB connection.
Mains: (220 V, 50/60 Hz on request 110 V, 60 Hz)

Inputs servo amplifier:

  • Control signal for the pump: 0..10 V

Output servo amplifier:

  • Output voltage for the pump: +12 V (PWM)

Inputs signal adaption unit :

  • 3 sensor signals, range: 0 ... 20 mA
  • 2 control signals for the pumps in the range: -10 ... +10 V

Outputs of the signal adaption unit :

  • Liquid level of the cylinder: +10..-10 V for external controller
  • Control signal for the pump: 0..10 V

Analog controller:
Two setpoints for the height are adjustable by potentiometers. Switching from one setpoint to the
other produces step responses. Proportional and integral portion are adjustable by a ten turn
potentiometer with precision knob. The integral portion can be switched off. The controller can be
linearized about the operating point by using a feed forward signal for the servo amplifier. The feed
forward signal can be adjusted by a potentiometer. All operating elements (switches and potentiometers) and the sockets for the measurement outputs are placed on the front panel together with a clearly visible block diagram.

Measurement outputs on the front panel:

  • Setpoint 1 for the height: 0..6 V
  • Setpoint 2 for the height: 0..6 V
  • Actual height: 0..6 V
  • Feed forward signal: 0..10 V
  • Control signal for servo: 0..10 V

External digital controller (Option 21-02USB or DAC)
As external controller a PC with USB interface or PC with PCIe slot and an A/D-D/A plug-in card
can be used. The option 21-02 DAC contains this card together with the connection cable to the
actuator. Both options (21-02USB and 21-02DAC) contain an executable controller program running with WINDOWS (for WINDOWS 7-10).

Inputs :

  • Sensor signals: -10...+10 V to 12 bit A/D converter for USB, 14 Bit for DAC

Outputs :

  • Control signals for pump servo: -10...+10 V from12 bit D/A conv. for USB, 14 bit for DAC

Program C-source (Option 21-03)
The controller program from option 21-02USB or DAC in C++ source with library functions for graphic output, controlling the sampling period as well as controlling the USB interface and the PC adapter card requires the Embarcadero C++ Builder V10.

Technical data are subject to change (Date 4-December-2017)