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3 Installation
2. Hold the fitting body steady with a backup wrench, and with
another wrench rotate the nut another 1
The gas pressure should be reasonably regulated. Pressures between 3
and 40 psig are acceptable as long as the pressure, once established, will
keep the flowmeter reading in an acceptable range (0.1 to 2.4 SLPM). Exact
figures will depend on your process.
If greater flow is required for improved response time, install a bypass
in the sampling system upstream of the analyzer input.
SAMPLE IN: This is the inlet for sample gas. It feeds into an electri-
cally operated valve, inside the housing, that controls the flow of the span
gas. The valve is completely under control of the 3010 Control Unit. It can
be externally controlled only indirectly through the Remote Cal Inputs,
described below under Electrical Connector/Control Panel.
ZERO IN and SPAN IN: These are inlets for zero gas and span gas.
There are electrically operated valves inside for automatic switching between
sample and calibration gases. These valves are completely under control of
the 3010 Control Unit. They can be externally controlled only indirectly
through the Remote Cal Inputs, described below.
EXHAUST OUT: Exhaust connections must be consistent with the
hazard level of the constituent gases. Check local, state, and federal laws,
and ensure that the exhaust vents to an appropriately controlled area.
3.4
Electrical Connector Panel
All electrical connections are made on the internal Electrical Connector
Panel, inside the explosion-proof enclosure, illustrated in Figure 3-3. The
signals are described in the following paragraphs. Wire size and length are
given in the Drawings section at the back of this manual. To access the
Panel, remove the explosion-proof cover as described in chapter 5, Mainte-
nance. NEVER OPEN THE COVER IN A HAZARDOUS ATMO-
SPHERE. THE AREA MUST BE DECLARED TEMPORARILY SAFE
BY THE PROPER AUTHORITY FIRST.
3-4: Part II
Model 3010
/
turns.
1
4
T
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