A chemical monitor system is disclosed that controls a multiplexable valve array 90 to route a fluid sample from any of plural fluid sample sources 20-38 to any of plural monitors 142-160 which will produce the most valuable chemistry measurement for diagnosing any existing or suspected malfunction....http://www.google.com.au/patents/US5073499?utm_source=gb-gplus-sharePatent US5073499 - Chemical diagnostic system
