SPM Single Point Monitor
SPM Technical Handbook
5-15
The customer is to supply the remote device providing
a momentary contact closure of at least 0.1 seconds.
External circuit resistance of 1500 Ohms or less with
current rating greater than 3.5 mA. See
for more information on SPM output connections and
relay terminal status.
A
K
J
H
P
L
B
C
D
M
N
F
E
G
5.11 Two-point Operation
The 2 x 15-meter (50 foot) option allows the SPM to
monitor two points, each point being 15 meters (50 feet)
from the SPM. An SPM installed with this option will not
be able to signal the specific point at which a release
has occurred, but will indicate that one of the monitoring
points is in a gas condition. The necessary sample tubing
is supplied with this option. 50 feet of polypropylene
exhaust tubing (3/16” I.D. x 1/4” O.D.) is included with
this option. A larger capacity pump is also provided.
Warning
1. The sample tubing enclosed with your
SPM must not be altered in any way. This
option is intended for ambient monitoring
only. Sampling at two points with different
pressures should not be done.
2. The Two-point Option only applies for target
gases that allow 50 feet of sample line. See
Section 4.10 for information on sample line
limitations.
5.11.1 Installation
The two pieces of 15-meter (50 foot) tubing must be
installed by inserting the end of the tubing into the fitting
and tightening with an adjustable wrench, as shown.
Route the tubing to your monitoring points. DO NOT CUT
OR SHORTEN TUBING. Excess tubing can be coiled
to take up any slack. Make sure that there are no kinks
or sharp bends in the tubing.
5.11.2 Operation
The operation of the 2-point SPM is the same as a basic
SPM with the exception of longer sample lines and a
diluted concentration. The SPM draws the sample from
two points. If a release occurs at one point, the other
point may still draw a clean sample. The mixing of a clean
sample and an actual release will form a diluted sample.
The concentration that appears on the SPM display will
indicate a combined (diluted) concentration. No attempts
have been made to correct for this dilution since the ratio
of a clean sample versus an actual release can vary.
Содержание SPM
Страница 8: ...SPM Single Point Monitor Midas Technical Handbook 1 1 1 Operation ...
Страница 15: ...SPM Single Point Monitor SPM Technical Handbook 2 1 2 Installation ...
Страница 20: ...SPM Single Point Monitor Midas Technical Handbook 3 1 3 Maintenance ...
Страница 24: ...SPM Single Point Monitor Midas Technical Handbook 4 1 4 Specifications ...
Страница 36: ...SPM Single Point Monitor SPM Technical Handbook 5 1 5 Options ...
Страница 53: ...SPM Single Point Monitor SPM Technical Handbook A 1 A Bi Directional Communications Protocol ...
Страница 61: ...SPM Single Point Monitor SPM Technical Handbook B 1 B Warranty Statement ...