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Thank you for selecting SteriPEN

®

 Protector

Opti

. Years of careful  

research, development and testing have gone into this unique  

UV water purification product.

Directions for Use  40 C.F.R. §156.10(i)(2)

It is a violation of Federal law to use this product in a manner inconsistent 

with its labeling. 40 C.F.R. §156.10(i)(2)(ii)

SteriPEN

®

 purifiers meet or exceed U.S. EPA Guide Standard and Protocol for 

Testing Microbiological Water Purifiers, destroying over 99.9999% of bacteria, 

99.99% of viruses, and 99.9% of protozoa (giardia & cryptosporidium) when 

used as directed. SteriPEN

®

 Protector

Opti

 is not a sterilizer.

SteriPEN

®

 Protector

Opti

 requires use in bottles or containers with a minimum 

opening of 4.4 cm (1.75 in.).

Operating the SteriPEN® Protector

Opti

Safety

SteriPEN® Protector

Opti

 may be used in glass, plastic, ceramic or metal 

containers. They all absorb and reflect UV light, thereby shielding the user from 

UV exposure. Protector

Opti

 should not be used in quartz containers. The air/

water interface at the top of any drinking container is highly reflective to UV and 

reflects UV back into the container. 

Optical Water Sensor 

SteriPEN

®

 Protector

Opti

 features an advanced proprietary optical water sensing 

technology. This is an important safety feature intended to prevent UV exposure 

by permitting operation only when lamp is completely immersed in water. Never 

attempt to bypass this feature. If the SteriPEN

®

 Protector

Opti

 does not detect 

water within 15 seconds of being activated, it will deactivate.
 

Agitation of Water 

Agitation of the water by stirring with Protector

Opti

 or rocking the container 

throughout the dose is essential for proper operation as this insures uniform 

exposure of all water to germicidal UV light. 

Cold Weather Considerations 

Bring Protector

Opti

 up to a temperature above 32°F/0°C  

before using. B    attery performance may be adversely affected by cold 

weather.

Lamp Life

Lamp Life = 8,000 Treatments, lamps must be replaced  

by manufacturer or SteriPEN

®

 technician.

Hydro-Photon, Inc.   

PO Box 675 

262 Ellsworth Road 

Blue Hill, ME 04614 USA 

Toll Free USA: 1-888-SteriPEN

 

(+1) 207-374-5800 

[email protected] 

www.steripen.com 

         

PRO.UG.1106

SteriPEN

®

 Protector

Opti

 User’s Guide

Instructions for Using SteriPEN

®

 Protector

Opti

Operating Signals

Green, fast flashing (after  

button push)
Green, slow flashing: 1 second on, 

1 second off (after dose completion)
Green, steady (after dose  

completion)
Green blinks for 15 seconds  

followed by a quick Red flash 

Red, steady

Battery Warnings

Red, fast flashing 

Green slow blinking with  

Red flashes
Green, steady with  

Red flashes
LED will not come on 

 

 

Lamp Warnings

Red 2 flashes, Green 2 flashes  

(repeating) 

Red 3 flashes, Green 1 flash 

(repeating)
Normal indicator LED function,  

yet UV lamp emits no visible light
No LED indicator and UV lamp 

emits no visible light

Unit is armed and ready to  

treat water
32 fl. oz. (1 L) dose completed 

16 fl. oz. (0.5 L)  

dose completed
Time expired, try again. The user has 

15 seconds to put the SteriPEN

®

  

purifier in water after activation. 
Dose incomplete. Repeat treatment.

 

 

Low battery warning; replace or 

recharge batteries
32 fl. oz. (1 L) dose completed;  

low battery
16 fl. oz. (0.5 L) dose  

completed; low battery

(1) 

Check battery orientation 

(2)

 Charge or replace batteries 

(3)

 Clean battery contacts 

(4)

 Return SteriPEN

®

 purifier for repair 

 

 

Over 7,900 treatments completed; 

lamp replacement needed in under 

100 doses
Lamp failure; replace lamp 

Lamp failure. Do not consume water. 

Battery issue or Lamp failure; Try 

fresh batteries, then contact support

SteriPEN

®

 Protector

Opti

 LED (Light Emitting Diode) Signals

LED Color and Pattern Display 

Indication

SteriPEN

®

 Protector treats two ranges of water volume:

A

—between 0.5 – 1 L (16 – 32 fl. oz.)

B

—up to 0.5 L (16 fl. oz.) 

1

 

Install two CR123 batteries with polarities as 

shown; or install one double-cell CR123 battery. 

Tighten coin screw on battery end cap until snug (do 

NOT over-tighten screw as this may cause damage).

2

  Remove lamp cover – pull cover off body.

3A

  Push Activation button once – green indicator LED 

(near button) and white optical sensor (near lamp) 

will flash for up to 15 seconds indicating Protector is 

ready to treat up to 1 liter (32 fl. oz.).

3B

  Push Activation button twice – green indicator LED 

(near button) and white optical sensor (near lamp) 

will flash for up to 15 seconds indicating Protector is 

ready to treat up to .5 liter (16 fl. oz.).

4

  While green indicator LED and white optical sensor 

flashes, dip the ultraviolet (UV) lamp into the water  

to be treated such that lamp and optical sensor are 

completely immersed. When water is detected, lamp 

turns on automatically, emitting both UV and visible 

light. IMPORTANT NOTE: If visible light from UV lamp 

is not evident, the Protector UV lamp is not on, and 

water should not be consumed.

5

  Agitate the water throughout the dose by stirring with 

the Protector until the lamp automatically turns off. 

Once lamp turns off, green indicator LED will turn on 

to show that the UV dose is complete. NOTE: If red 

LED turns on after lamp shuts off, the dose was not 

complete. 

6

  Remove Protector from water. Dry off lamp and opti-

cal water sensor with clean cloth. IMPORTANT NOTE: 

Many brands of CR123 batteries have built-in protec-

tion circuitry that instantly disables battery function 

when batteries reach a specific low charge threshold. 

If this “disable” function is triggered during operation 

the Protector will be unable to give the “Low Battery” 

signal (blinking red LED). Until batteries are replaced 

or recharged the Protector will not be operational.

7

  To activate the flashlight, press and hold the activa-

tion button for 3 seconds. The flashlight will automati-

cally be on for 3 minutes; reactivate as needed. To 

turn off the flashlight, push the activation button once. 

To protect UV lamp when using the flashlight, operate 

with lamp cover in place.

Quick Start Guide

Use SteriPEN

®

 Protector

Opti

 with clear water. Discolored or dirty water 

should be pre-filtered until clear prior to SteriPEN

®

 Protector treatment. 

See also “Treating Turbid, Murky, or Cloudy Water.”

5

1

2

3

4

5

6

7

Guide to SteriPEN

® 

Protector

Opti

 Parts

1)  UV Lamp Cover 
2)  UV Lamp Assembly 
3)  Optical Water Sensor  

     & LED for flashlight
4)  Activation Button 
5)  Indicator LED (Light Emitting 

     Diode): shows activation status 
6)  Battery Compartment End Cap
7)  Battery Compartment End Cap Screw

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