Emerson OXYMITTER 4000 - Manual (Page 45)

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-9
Oxymitter 4000
1-3 IMPS 4000 (Optional)
Information on the IMPS 4000 is available in the
IMPS 4000 Intelligent Multiprobe Test Gas Se-
quencer Instruction Bulletin.
1-4 SPS 4000 (Optional)
The SPS 4000 Single Probe Autocalibration
Sequencer provides the capability of performing
automatic, timed or on demand, calibrations of a
single Oxymitter 4000 without sending a techni-
cian to the installation site.
a. Mounting
The SPS 4000 can be mounted either di-
rectly to an Oxymitter 4000, to remote elec-
tronics, or at a remote location if space is
limited. In addition, the integrally mounted
SPS 4000 can be configured for a horizon-
tally or vertically mounted Oxymitter 4000
(Figure 2-3). The information in this instruc-
tion bulletin will cover the integrally mounted
units only. For information on remote
mounted units, refer to the SPS 4000 Single
Probe Autocalibration Sequencer Instruction
Bulletin.
b. Components (Figure 1-9)
The SPS 4000 consists of a manifold and a
calibration gas flowmeter. The manifold
provides electrical feedthroughs and cali-
bration gas ports to route power and signal
connections and calibration gases to and
from the sequencer. In addition, the mani-
fold houses two calibration gas solenoids
that sequence the gases to the Oxymitter
4000, a pressure switch that detects low
calibration gas pressure, and two PC
boards. A terminal strip housed within the
terminal cover provides convenient access
for all user connections.
Components optional to the SPS 4000 in-
clude a reference air flowmeter and pres-
sure regulator. The reference air flowmeter
indicates the flow rate of reference air con-
tinuously flowing to the Oxymitter 4000. The
reference air pressure regulator ensures the
instrument air (reference air) flowing to the
Oxymitter 4000 is at a constant pressure
[20 psi (138 kPa)]. The regulator also has a
filter to remove particulates in the reference
air and a drain valve to bleed the moisture
that collects in the filter bowl.
Brass fittings and Teflon tubing are stan-
dard. Stainless steel fittings and tubing are
optional. Also, disposable calibration gas
bottles are available as an option or can be
purchased through a local supplier.
c. Operation
The SPS 4000 works in conjunction with the
Oxymitter 4000’s CALIBRATION RECOM-
MENDED feature to perform an autocalibra-
tion. This feature automatically performs a
gasless calibration check every hour on the
Oxymitter 4000. If a calibration is recom-
mended and its contact output signal is set
for “handshaking” with the sequencer, the
Oxymitter 4000 sends a signal to the se-
quencer. The sequencer automatically per-
forms a calibration upon receiving the
signal. Thus, no human interface is required
for the automatic calibration to take place.