Section IIPREPARATION FOR USE2-1 UNPACKINGEach senTorr unit is inspected and carefully packed prior to shipment. If the unit arrives damaged,save the packing material and immediately notify the carrier. Because the packing materials aredesigned specifically for this instrument, they should always be used when transporting the unit. Theshipping container is packed with the following contents.1 senTorr Basic Unit1 A-C line cord1 Instruction Manual4 rubber adhesive feet for bench top use of the senTorr2-2 INSTALLATIONBefore operating the unit, it is necessary to set it for the proper line voltage level.1. Open the unit by removing the two screws at the top rear of the unit then pivot the cover upand back to disengage the front lip. Lift off the cover.2. Set the line voltage by moving line voltage selector switch S1 (Figure 2-1) to either the 115 VAC(for 110 VAC or 115 VAC, 50/60 Hz) or 230 VAC position (for 220 VAC or 240 VAC, 50/60 Hz).3. Before replacing the top cover, check that switch S1 is correctly positioned, that all cables areproperly plugged in, and there is no loose hardware or metal parts inside the senTorr unit.Replace the cover and secure it with the two screws.4. Mount the unit using the desired rack-mounting kit, then attach the appropriate externalgauge and system cables. Refer to Figure 2-2 for rear panel connections and Figure 2-3 formounting dimensions.2-1NOTE________The unit is shipped with switch S1 (internal) set to 230 VAC.WARNING_____________Before servicing the unit, check that the line cord is not plugged into apower source. Observe all warnings and cautions printed on the cover.