Ametek 900

5-44 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Replacing the external Sample Cell RTD:
a. Wrap a small piece of rubber around the RTD tip, grip the tip with
channel-lock pliers, and loosen/remove it (counter-clockwise). Use
short needle-nose pliers to remove the RTD Base from the Upper
Heater Plate. Carefully pull its wire out from the Seal Body and
through the Lower Heater Plate only at this time.
IMPORTANT
When replacing an external RTD, do not remove the RTD wire
from the Upper Heater Plate at this time.
b. Assembly the new RTD (P/N 300-4924) and its Base (P/N 300-4914).
The RTD Base (and RTD Tip, P/N 300-4913) may be reused if not
damaged.
c. Pull the faulty RTD out of the Upper Heater Plate approximately
1", just enough to expose some of the wiring. Cut off the RTD
head, strip off some insulation, and solder the termination end of
the new RTD wire to the RTD end of the old RTD wire. Use the old
wire to pull the new RTD wire through the Upper Heater Plate as
you remove the old wire. Label the new RTD wire “Sample Cell”.
d. Apply Loctite 271 (P/N 300-4478) on the small (lower) threads of
the RTD Base. Rotate the Base counter-clockwise 3–4 turns (take
care not to over-stress the wire) and then screw (clockwise) the
Base into the Upper Heater Plate. Hand-tighten the Base. Using
short needle-nose pliers, tighten the Base until it is snug. Pull the
RTD wire from the bottom of the Upper Heater Plate, until the RTD
is seated inside the Base.
e. Apply Loctite 271 on the large (upper) threads of the Base. Thread
the RTD Tip clockwise onto its Base and hand-tighten it.
To protect the Tip, wrap a small piece of rubber around it, lightly
grip it with channel-lock pliers, and tighten it until it is snug.
f. Repeat Steps ‘a’ through ‘e’ if replacing the optional Sulfur
Condenser RTD (if used).
If the Sulfur Condenser RTD is not used, the hole is plugged with a
Heater Blanking Plug.
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NOTE
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NOTE