9E3ZM-B
Protective measures against aggressive chemicals
The E3ZM family of high grade stainless steel
sensors has been designed with the goal to
achieve long sensor lifetime in frequently
cleaned environments.
High grade SUS 316L housings provide high re-
sistance to aggressive chemicals but the life-
time of a sensor is not only determined by the
case material. The design quality is determined
by the resistance against detergents of the
complete protective structure. When designing
a sensor, potential weak points are the material
selection and areas where 2 materials connect
e.g. the lens, cable entry or the potentiometers.
The materials and design structure for the
E3ZM have been intensively researched and
tested to provide high detergent resistance and
sensor lifetime in daily operations compensat-
ing for mechanical and temperature stress, high
pressure water and aggressive chemicals.
Note: The Sensor was immersed in the chemicals, detergents, and disinfectants listed above at the temperatures in the table for 240 hours and then passed an
insulation resistance of 100 MΩ min.
Protective measures against water ingress
The family of E3ZM photoelectric sensors is designed and tested for highest protection against water ingress. For achieving the best
protection in frequently cleaned environments and to prevent potential errors during installation and operation, refer to the recommenda-
tions below.
1. Using pre-wired models
The pre-wired models are manufactured
to provide highest protection against
water ingress both at the sensor and via
the cable.
RECOMMENDATION:
Use pre-wired versions if protection
against water ingress is key and fre-
quent replacement of the sensor is not
expected
2. Using M8 connector models
Connector models are often preferred to
allow an easy exchange of the sensor.
When using M8 connector models, ob-
serve the recommended mounting
torque (see page 10). A too tight con-
nection may damage the sealing ring
and a loose connection may provide an
opportunity for water to enter into the
connection between sensor and connec-
tor.
RECOMMENDATION:
To obtain the correct mounting torque, a
torque wrench may be used.
3. Using a M12 or M8 pigtail connector
Using a pigtail cable connector with
30 cm of PVC cable and an M8 or M12
plug combines the highest protection
against water ingress of the pre-wired
version with the flexibility of the connec-
tor models for easy exchanging the sen-
sor.
In general the M12 connectors provide
an enhanced protection against installa-
tion errors compared to M8 connectors.
Additionally the XS5 click connectors al-
ways ensure that the correct tightening
torque is applied for optimal protection.
RECOMMENDATION:
Use pigtail connectors for the best combination of protection and
flexibility for exchanging the sensor.
For ordering pigtail connectors contact your OMRON representa-
tive.
Category Product name Concen-
tration
Temper-ature Time
Chemical Sodium hydroxide (NaOH) 1.5% 70°C 240 h
Potassium hydroxide (KOH) 1.5% 70°C 240 h
Phosphoric acid (H
3
PO
4
) 2.5% 70°C 240 h
Sodium hypochlorite (NaCIO) 0.3% 25°C 240 h
Hydrogen peroxide (H
2
O
2
) 6.5% 25°C 240 h
Alkaline foam detergent P3-topax-66s (Manufactured by Ecolab) 3.0% 70°C 240 h
Acidic foam detergent P3-topax-56 (Manufactured by Ecolab) 5.0% 70°C 240 h
Disinfectant P3-oxonia active 90 (Manufactured by Ecolab) 1.0% 25°C 240 h
TEK121 (Manufactured by ABC Compounding) 1.1% 25°C 240 h
Indicator cover: Polyether Sulfone
(PES)
High resistance to detergents and
disinfectants.
Waterproofing ring: Fluorine rubber
High resistance to detergents and
disinfectants.
Optical plate: Methacyrlic resin
(PMMA)
High resistance to detergents
and disinfectants. High
transparency and other qualities
give PMMA excellent optical
characteristics.
Seal
The seal provides the resistance to
high-temperature and high-pressure
water that complies with IP69K.
High resistance to detergents and
disinfectants. Also has excellent abrasion
resistance.
Sensitivity adjustment and operation
switch: Polyether etherketone
(PEEK)
High corrosion resistance
to many chemical reagents.
Case: SUS316L
High resistance to detergents and
disinfectants.
Cable: Vinyl chloride
Highest protection
and fast exchange
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