The Over-The … They are reverse battery protected, drawing very little current for reverse supplies up to 50V. Chapter 8 details typical control valve installation and maintenance procedures. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315µA per amplifier. ... 65 3.4.6 ENVIRO-SEAL PTFE Packing..... 65 3.4.7 ENVIRO-SEAL Duplex Packing..... 67 3.4.8 ISO-Seal PTFE Packing ..... 67 3.4.9 ENVIRO-SEAL Graphite ULF..... 67 3.4.10 HIGH-SEAL Graphite ULF .....67 3.4.11 ISO-Seal Graphite Packing..... 67 3.4.12 ENVIRO-SEAL Graphite for Rotary … The LT®6015/LT6016/LT6017 are single/ dual/quad rail-to-rail input operational amplifiers with input offset voltage trimmed to less than 50µV.