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Welded stainless steel Bourdon tubes reduce chance of leakage, (even in the event of fire), in Model BB Differential Pressure Switches. Units are ideal for checking differential pressure (head) across high pressure pumps and filters. Hermetically sealed mercury wetted contacts help ensure reliable operations. Extra sensitive (fixed deadband) units are available on special order, as are weatherproof and explosion-proof enclosures.

SPECIFICATIONS
Wetted Materials: 403 SS Bourdon tube. 316 SS optional.
Temperature Limits: -10 to 180°F (-23 to 82°C).
Pressure Limit: Maximum pressure of the operating range.
Enclosure Rating: General purpose. Weatherproof and explosion-proof optional.
Switch Type: See Model Chart on "Ordering" page.
Electrical Rating: See Model Chart on "Ordering" page.
Electrical Connections: Screw type.
Conduit Connection: 7/8" (22.23 mm) hole for 1/2" (12.7 mm) conduit hub.
Process Connection: 1/4" male NPT . 1/2" male NPT on ranges 15S and 16S.
Mounting Orientation: Vertical. Vibration Free.
Set Point Adjustment: Thumbwheel screw.
Weight: 4 lb (1.8 kg).
Deadband: See chart on "Ordering" page.
Agency Approval: CSA.

SWITCH DEADBAND

RANGE TABLE psi (hg/cm ²)

SINGLE STAGE

TWO STAGE 4XX

Range
No.

Adj. Range
psid
(kg/cm²)

Max.
Range
psid
(kg/cm²)

Approx.
Fixed Deadband
2XX-2
2XX-3
psid (kg/cm²)

Adjust.
Deadband
5XX-2
5XX-3
psid
(kg/cm²)

Approx.
Fixed
Deadband
Each Switch
psid (kg/cm²)

Spread Between
Switch Operations
psi (kg/cm ²)

Min.

Max.

Min.

Max.

25S
6S
8S
9S
10S
11S
12S
13S
15S
16S
23E
6E
4E
9E
21E
22E
11E
13E

0-40 (0-2.8)
0-40 (0-2.8)
0-120 (0-8.4)
0-180 (0-12.6)
0-360 (0-25.2)
0-600 (0-42)
0-900 (0-63)
0-1500 (0-105)
0-3000 (0-210)
0-5000 (0-350)
0-38 (0-2.65)
0-36 (0-2.50)
0-55 (0-3.85)
0-200 (0-14)
0-275 (0-19)
0-450 (0-31)
0-500 (0-35)
0-925 (0-65)

60 (4.2)
100 (7)
200 (14)
300 (21)
600 (42)
1000 (70)
1500 (105)
2500 (175)
5000 (350)
8000 (562)
75 (5)
100 (7)
150 (10)
300 (21)
400 (28)
800 (56)
1000 (70)
2500 (175)

.4 (0.028)
.4 (0.028)
.75 (0.053)
1.25 (0.088)
5 (0.35)
10 (0.7)
10-15 0.7-1.05)
30 (2.1)
50 (3.5)
150 (10.5)
1.25 (0.09)
1.8 (0.12)
2 (0.14)
3.75 (0.26)
6.5 (0.46)
13 (0.90)
25 (1.75)
50 (3.50)

3 (0.21)
3 (0.21)
4 (0.28)
6 (0.42)
15 (1.05)
20 (1.4)
40 (2.8)
50 (3.5)
125 (8.75)
500 (35)
3.5 (0.25)
4 (0.28)
5 (0.35)
14 (1.0)
18 (1.27)
20 (1.40)
25 (1.75)
65 (4.60)

40 (2.8)
40 (2.8)
120 (8.4)
180 (12.6)
360 (25.2)
600 (42)
900 (63)
1500 (105)
3000 (210)
5000 (350)
38 (2.65)
36 (2.50)
55 (3.85)
200 (14)
275 (19)
450 (31)
500 (35)
925 (65)

.5 (0.035)
.5 (0.035)
2 (0.14)
4 (0.28)
7 (0.49)
--
12 (0.84)
20 (1.4)
40 (2.8)
125 (8.8)
2 (0.14)
2.5 (0.18)
3.25 (0.23)
6 (0.43)
9 (0.64)
20 (1.40)
35 (2.50)
50 (3.50)

2 (0.14)
2 (0.14)
3 (0.21)
5 (0.35)
12 (0.84)
--
32 (2.24)
62 (4.34)
100 (7)
300 (21)
2.25 (0.16)
3 (0.21)
4 (0.28)
7 (0.49)
12 (0.84)
26 (1.83)
45 (3.10)
90 (6.23)

12 (0.84)
12 (0.84)
40 (2.8)
60 (4.2)
80 (5.6)
--
200 (14)
300 (21)
1500 (105)
2000 (140)
5.5 (0.40)
9 (0.63)
11 (0.77)
27 (1.90)
60 (4.22)
75 (5.27)
125 (8.80)
175 (12.30)