Teledyne OT-3 - Manual (Page 20)

Installation OT-3
Teledyne Analytical Instruments 12
The same digital information is also sent to a 12-bit digital to analog
converter (DAC) that produces the 0-10 V dc analog concentration
signal and the 0-10 VDC analog range ID output. A voltage to current
converter (E–I CONV) produces the 4-20 mA DC analog concentration
signal.