Routing and Placement
MSA recommends the use of at least two gas-monitoring points per chiller for sufficient detection monitoring. Due to installation and application variations, each system must be analyzed individually.
Do a smoke test of the mechanical room to determine the flow pattern and allow for optimal placement of the sample lines. Ventilation smoke tubes for this use are available from MSA (P/N 458480). For a list of approved parts and how to order them, refer to Ordering Information.
Keep the total line length of a point, including the sample line and exhaust line, at less than 1200 ft (366 m). Keep lines as short as possible to minimize the transport time of the device.
|
Transport Time |
||||
|
Line Length |
4 pts
|
8 pts
|
16 pts
|
|
|
ft |
m |
|||
|
0 |
0 |
19 s |
19 s |
19 s |
|
50 |
15, 24 |
19 s |
19 s |
19 s |
|
100 |
30, 48 |
19 s |
19 s |
19 s |
|
150 |
45,72 |
19 s |
19 s |
19 s |
|
200 |
60,96 |
19 s |
19 s |
19 s |
|
250 |
76, 2 |
19 s |
19 s |
19 s |
|
300 |
91,44 |
1 m 35 s |
2 m 51 s |
5 m 23 s |
|
350 |
106,68 |
1 m 35 s |
2 m 51 s |
5 m 23 s |
|
400 |
121,92 |
2 m 51 s |
5 m 23 s |
10 m 27 s |
|
450 |
137,16 |
2 m 51 s |
5 m 23 s |
10 m 27 s |
|
500 |
152,4 |
2 m 51 s |
5 m 23 s |
10 m 27 s |
*Transport time is similar for all tubing configurations.
Typically, refrigerants collect near the floor. Install the sample points 12–18 in. (30–46 cm) above the floor.
Ammonia gas is lighter than air and tends to be rising to the ceiling. MSA recommends placing sample points at potential leak points.
For installations where water condensation in the sample lines is likely, MSA recommends installing a water trap filter such as a Parker P/N F504-01AHX67 or equivalent.
To confirm sample lines are labeled and routed appropriately, apply calibration gas to the end of the line and confirm device response.