Adjustments To Factory Settings
The EPS10EXP device is pre-adjusted at the factory to alarm at
4–8 PSI on rising pressure (see Table 2). Pressure switch settings
may be adjusted in the field to obtain a different pressure alarm
response from 4 PSI to 20 PSI. The switch has an override feature
on the adjustment mechanism to prevent exceeding the 20 PSI
max. setting of the switch. This override feature carries with it
a tolerance band that may limit the upper adjustment to 16–20
PSI. Care must be used when setting the switch to ensure that the
lower limit of 4 PSI is not exceeded. This will allow the switch to
reset within the 3 PSI differential stated.
1. Install pressure switch as stated in “INSTALLATION” portion
of instruction manual. Attach pressure test source to system.
2. Remove adjustment wheel cover and back off locking screw
(see Figure 1) to allow main adjustment wheel to rotate freely.
3. Test trip point by slowly introducing pressure from the pres-
sure test source. When trip point is found, reduce pressure
to zero. Rotate main adjustment wheel (counterclockwise to
increase pressure) and retest until switch trip point is at the
desired pressure setting (4–20 PSI range). Each tine on the
wheel represents an approximate trip point change of 0.2 PSI.
One full rotation changes the trip point setting by approxi-
mately 2.5 PSI. A reset differential of approximately 3 PSI is
typical throughout the entire adjustment range of switch.
4. Retest the set point several times to ensure accuracy of setting.
5. Re-seat locking screw.
6. Re-install adjustment wheel cover.
Table 2.
NOTE: The sensor assembly is not field replaceable. Do not
attempt to disassemble these parts. If you have any ques-
tions, consult Safe Signal. Safe Signal recommends care-
ful consideration of the following factors when specify-
ing and installing Alarm Pressure Switches. Always
refer to the Installation and Maintenance Instruction
for specific recommendations on individual devices
before installing the unit.
• Electrical ratings stated in literature and on nameplates
should not be exceeded.
• Overload on switch can cause failure on the first cycle.
Always wire devices according to national and local electri-
cal codes.
• Install units away from shock and vibration. Proper electri-
cal fittings should be used to prevent moisture from enter-
ing the enclosure via the conduit.
• Test all devices for proper operation after initial installa-
tion. Perform preventive maintenance and periodic testing
as required by the applicable NFPA standards but not less
than bi-monthly.
• Install a back-up control for all critical applications where
control failure could endanger life or property. A backup
control to serve as a high or low limit control is especially
recommended for applications where a runaway condition
could result.
• Do not mount unit where ambient temperatures will
exceed published limits.
• Avoid impact or mechanical loading.
FACTORY SETTINGS (PSI)
MODEL
Approx. Reset
EPS10EXP
4–8
3 PSI Diff.
Rise
THREE-YEAR LIMITED WARRANTY
SAFE SIGNAL warrants that the equipment herein shall conform to said descriptions as to all af-
firmation of fact and shall be free from defects of manufacture, labeling, and packaging for a pe-
riod of three (3) years from the invoice date to the original purchaser, provided that representative
samples are returned to SAFE SIGNAL for inspection. Upon a determination by SAFE SIGNAL
that a product is not as warranted, SAFE SIGNAL shall, at its exclusive option, replace or repair
said defective product or parts thereof at its own expense except that Purchaser shall pay all
shipping, insurance, and similar charges incurred in connection with the replacement of the
defective product or parts thereof. This Warranty is void in the case of abuse, misuse, abnormal
usage, faulty installation, or repair by unauthorized persons, or if for any other reason SAFE
SIGNAL determines that said product is not operating properly as a result of causes other than
defective manufacture, labeling, or packaging.
3
I56-1427-C
4/21
