Upgrade your existing Model 121 Acid Etchant Control/Monitor System to the new Model 141 for $1340. The upgrade kit consists of:
Installation requires simply removing the old encoder circuit and encoder card and installing the new ones. Disconnect the Mod. 121 Monitor and replace it with the Mod. 136 Process Monitor. All electrical connections to the Mod. 120 Power Module and all plumbing connections to the Mod. 121 Control remain unchanged.