Gems Sensors & Controls VACUUM SWITCHES Part Numbering Designation

PRESSURE SWITCHES

How To Order

Use the Bold characters from the chart below to construct a product code. Please reference Notes.

PS81 -10 -4MNB -C -H -XX -XXXX

1 2 3 4 5 6

VACUUM SWITCHES

1 Pressure Range Code

Insert Pressure Range Code from Table 1, below.

2 Pressure Fitting

1

-2MNB = 1/8˝ NPTM Brass

-4MNB = 1/4˝ NPTM Brass

-4MGB = 1/4˝ BSPM Brass (G type)

-4MSB = 7/16˝-20 SAE Male, Brass

3 Circuit

-A = SPST/N.O.

-B = SPST/N.C.

-C = SPDT

4 Electrical Termination

-FLXX = Flying Leads

-ELXX = 1/2˝ NPT Male Conduit w/Flying Leads

-H = DIN 43650A Male Half Only

-HC = DIN 43650A 9mm Cable Clamp

2

4

4

-HN = DIN 43650A with 1/2˝ Female NPT Conduit

5 Options

-V = Viton

-E = EPDM Diaphragm

-K = Kapton

®

Diaphragm

®

Diaphragm (Nitrile O-ring)

-G = Gold Contacts
(for loads less than 12 mA @ 12 VDC)

-OF = Oil Free Cleaned

6 Fixed Set Point (optional)

A. Specify set point -FS
(in Inches Hg or mBAR, see example)

5

B. Set Point Actuation
R on Rising Vacuum
F on Falling Vacuum

3

4

Example: -FS100MBARF for 100 mBAR Falling
or -FS2INHGR for 2˝ Hg Rising

Notes:

1. Other fittings available.
Consult factory.

2. 18˝ is standard. Specify lead
length in inches (max. 48˝).
e.g. -FL18 or -FL30.

3. 18˝ is standard. Specify
lead length in inches (max.
48˝). e.g. -EL18 or -EL30.

4. DIN connectors require -C
SPDT circuit.

5. Set Point must be within
Pressure Range selected in
Step 1.

Table 1 — Pressure Range Codes

Pressure Range Code Pressure Range Accuracy* Average Deadband**

10 1.5-5” Hg (51-169 mbar) ±0.2” Hg (7 mbar) +3% of setting 0.3” Hg (10 mbar) +9% of setting

20 4-15” Hg (136-508 mbar) ±0.35” Hg (12 mbar) +4% of setting 0.6” Hg (20 mbar) +11% of setting

* Accuracy and set point of units may change due to the effects of temperature.
** In certain applications deadband can be tailored and controlled to customer specifications. Consult factory for details.