PLUGSYS Modules

Control modules

LLC

Liquid Level Controler type

This module is used for monitoring the liquid level in the oxygenator of the LANGENDORFF Heart apparatus, the WORKING HEART or ISOLATED LUNG apparatus. A level probe inside the oxygenator controls the solution
level and switches on the pump and the sling disc if the liquid level drops.

Description

Probe input 1/4 bridge, AC voltage signal f = 4kHz through 4-pin connector from the level electrode.

lMeasurement principe comparison of resistance of electrodes immersed in the solution with an internal resistor.

Sensitivity of the level electrode adjustable in the range of 2 kOhm to 50 kOhm

Outputs • output sockets for the two motors (pump and sling disc, adjustable from 2 V to 10 V, 1A max. each)
• motor on/off signal on the system bus to send this signal to the Flow Measurement module (TTL level)
• error signal on the system bus to send the status of the LLC to the Flow Measurement (TTL level).

Indication • LEVEL HIGH: LED green
• LEVEL LOW: LED yellow
• ERROR: LED red
• PUMP ON: LED green
• SLING DISC ON: LED green

ERROR to avoid an empty oxygenator when the flow increases too much, a special circuit (Dry Protection) is installed on this module.
If the on-time of the pump is longer than the selected MAX.PUMP ON-TIME an error beep occurs and the pump operates at maximum speed to refill the oxygenator as fast as possible.

MAX PUMP ON-TIME selectable from 1 to 16 s in steps of 1 s (for ERROR detection)

TEST button for rapid filling of the oxygenator (pump operates at max. speed)

supply 5 V/130 mA, +12 V/2 A max, -12 V/1 A max; isolation between level detector and pump control to prevent signal interference from the pump.

Dimension module for 19 inch rack, width 8 E ( 40.5 mm), hight 3 U (128.7 mm), depth Europe-size (220 mm)

Connector DIN 41612, 96 pin. VG

Weight 450 g

Accessories level electrode (suitable for oxygenator)

HUGO SACHS ELEKTRONIK-HARVARD APPARATUS GmbH
Gruenstrasse 1 · D-79232 March-Hugstetten · GERMANY
Phone: +49 (0) 76 65 - 92 00-0 · Fax: +49 (0) 76 65 - 92 00-90

Description
Probe input	1/4 bridge, AC voltage signal f = 4kHz through 4-pin connector from the level electrode.
lMeasurement principe	comparison of resistance of electrodes immersed in the solution with an internal resistor.
Sensitivity	of the level electrode adjustable in the range of 2 kOhm to 50 kOhm
Outputs	• output sockets for the two motors (pump and sling disc, adjustable from 2 V to 10 V, 1A max. each) • motor on/off signal on the system bus to send this signal to the Flow Measurement module (TTL level) • error signal on the system bus to send the status of the LLC to the Flow Measurement (TTL level).
Indication	• LEVEL HIGH: LED green • LEVEL LOW: LED yellow • ERROR: LED red • PUMP ON: LED green • SLING DISC ON: LED green
ERROR	to avoid an empty oxygenator when the flow increases too much, a special circuit (Dry Protection) is installed on this module. If the on-time of the pump is longer than the selected MAX.PUMP ON-TIME an error beep occurs and the pump operates at maximum speed to refill the oxygenator as fast as possible.
MAX PUMP ON-TIME	selectable from 1 to 16 s in steps of 1 s (for ERROR detection)
TEST	button for rapid filling of the oxygenator (pump operates at max. speed)
supply	5 V/130 mA, +12 V/2 A max, -12 V/1 A max; isolation between level detector and pump control to prevent signal interference from the pump.
Dimension	module for 19 inch rack, width 8 E ( 40.5 mm), hight 3 U (128.7 mm), depth Europe-size (220 mm)
Connector	DIN 41612, 96 pin. VG
Weight	450 g
Accessories	level electrode (suitable for oxygenator)