Table 1-1. Model 81I Valve Mode Status - Thermo Scientific Mercury Freedom 80i Manual

Table 1–1. Model 81i Valve Mode Status
Solenoid ID
Valve 1
Valve 2
Valve 3
Valve 4
Valve 5
Orifice Valve
Spike Valve
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(Model 82i), and a Hg probe (Model 83i), along with additional peripheral
components, such as a zero air supply, umbilical, and instrument rack.
However, the Model 81i is also available as a stand-alone calibrator.
Table 1–1 shows the Model 81i solenoid valve status for the different
calibrator modes. Use this table along with Figure 1–2 when reading the
principle of operation description that follows. Note that a valve status
shown as ON describes a valve that is energized, or in the Normally Closed
(NC) state. A valve status shown as OFF describes a valve that is de-
energized, or in the Normally Open (NO) state.
Standby Instrument
Zero
ON ON
OFF OFF
OFF OFF
OFF OFF
OFF OFF
OFF OFF
OFF OFF
Clean, dry, Hg-free pressurized air/nitrogen (30-40 psig) feeds both a high
flow (0-20 slpm) dilution air mass flow controller (MFC) and a low flow
(0-50 sccm) Hg source MFC (Figure 1–2).
Instrument Orifice
Cal Zero
ON ON
ON OFF
ON OFF
OFF ON
ON ON
OFF ON
OFF OFF
Orifice System System
Cal Zero Cal
ON ON ON
ON OFF ON
ON OFF ON
OFF ON OFF
OFF ON OFF
ON OFF OFF
OFF ON ON
Mercury System Manual
Introduction
Model 81i
1-3