Teledyne BDS-3000 - Oxygen analyzer - Manual (Page 42)

Installation BDS 3000
Teledyne Analytical Instruments 28
Remote Valve Connections: The Ultra Trace 3000 is a single-chassis
instrument, which has no Remote Valve Unit. Instead, the Remote Valve
connections are used as a method for directly controlling external
sample/zero/span gas valves. See Figure 3-5.
Figure 3-5: Remote Probe Connections
The voltage from these outputs is nominally 0 V for the OFF and
15 V dc for the ON conditions. The maximum combined current that can
be pulled from these output lines is 100 mA. (If two lines are ON at the
same time, each must be limited to 50 mA, etc.) If more current and/or a
different voltage is required, use a relay, power amplifier, or other
matching circuitry to provide the actual driving current.
In addition, each individual line has a series FET with a nominal
ON resistance of 5 ohms (9 ohms worst case). This can limit the
obtainable voltage, depending on the load impedance applied. See
Figure 3-6.
3.4 Electrolyte Refill of BDS Sensor
The BDS sensor was shipped dry. It must be filled with the
electrolyte before operation. The electrolyte is a caustic solution (10%
KOH), supplied in five 50 ml bottles. Review the Material Safety Data
Sheet (MSDS) in Section A-6 before handling the electrolyte.