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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
60
14 Product Change History
Due to upgrades performed on delivered MR850 Respiratory Humidifiers, software and
hardware versions are listed below.
It should be realised that possible future upgrades may change the operation of the Humidifier.
Please note that software Versions 4.40 and 4.44 will only work with Revision A or B PCB’s and
Version 5.12 or later will only work with Revision C, D or E PCB’s.
History Change for model JHU
PCB
Version
Software
Version
Introduction Serial Number Comments
A 4.40 19 September 1998 9885xxx00000 First production release.
A 4.44 22 October 1998 Software upgrade.
C 5.12 12 April 1999 9985xxx00053 Release of new PCB to
accommodate change in
temperature probe circuit
redesign.
C 5.13 5 May 1999 Software upgrade.
D 5.13 14 January 2000 2000-85xxx00028 Release of new PCB to improve
manufacture.
D 5.23 3 April 2000 2000-85xxx01661 Software upgrade for low flow
control stability.
D 5.33 25 July 2000 2000-85xxx02806 Software upgrade, allowing
Neonatal volume ventilation
capability. Manual Temperature
Compensation (TC)
implemented.
D 5.34 11 October 2000 2000-85xxx04212 Software upgrade to improve
EMI immunity.
D 5.45 19 February 2001 2001-85xxx00427 Software upgrade.
D 7.00 2 April 2002 2002-85xxx00976 Software upgrade.
Improve HC speed in Non-
invasive mode.
F&P Co-axial circuit recognition
and control.
D 5.70 14 April 2003 2003-85JHU008266 Software release USA only.
D 7.23 31 May 2004 2004-85JHU006084 Added Non-heater wire
operation.
PTS access through serial
command.
Humidifier model protection.
Remove HC.
Software release USA only.
E 7.23 5 July 2004 2004-85JHU008300 Release of new PCB capable of
selective soldering.