OPERATING THE SENTINEL

Warning: It is strongly recommended to test and operate the SENTINEL in dark conditions or at night time.

·        Install the batteries according to the directions in the section entitled “BATTERY INSTALLATION”.

·        Enter a dark environment.

·        Remove the objective lens cap by sliding it up on top of the objective lens (2).

·        Activate the scope by turning the power switch to the “ON” position (3); the indicator will turn green.

·        A red indicator means that batteries are low and the scope will be working with the IR illuminator turned on for 30 more minutes.

·        Select the color of the reticle, green or red, by pushing the button (5).

·        Adjust the reticle brightness by rotating the switch (4).

·        Please select an object of observation at a distance of approximately 100 meters (about 110 yards) away.  

·        Set up the objective focus ring knob (6) to be aligned with the mark "100"; it will become tighter as it reaches the mark, which is normal.

·        Focus on the selected object by rotating the eyepiece ring (7).

·        If needed, turn on the IR illuminator (8) by turning the switcher (3) to the “IR” position. IR red LED indicator lights up.

·        Rotate the IR illuminator lens ring until the IR illuminator beam is focused.

·        If after all the settings are completed and the image is still not clear, despite the distance and conditions do not rotate the eyepiece ring (7). Refocus by turning the objective lens ring (6) only and adjusting the IR illuminator (8) beam focus.

·        To turn off the SENTINEL, simply turn off the scope and close the cover over the objective lens.

·        After mounting the scope onto a rifle for the first time, zero it by following the instruction in section SIGHTING OF THE SENTINEL.

Note: The SENTINEL and its IR can be activated using the remote control.

SIGHTING IN THE SENTINEL

Warning: Be sure to follow proper safety instructions provided by the weapon manufacturer or vendor. 

To test the scope in a lighted area, protect the intensifier by keeping the lens cover over the objective lens of the scope. Regardless of being in the “ON” or “OFF” position, the IR illuminator will not have any effect in a lighted environment.

Note: The sighting of the scope should be performed under the same environmental and temperature conditions as the ones that the scope will be exposed to during its use.

In case when the aiming point (the center of the reticle) does not match the center of target, adjust by turning the windage/elevation knobs (11) RIGHT & UP until the aiming point (the center of the reticle) matches the center of target.

Take 3-4 control shots trying to be as accurate as possible aiming at the center of the target.

Examine the results. If the results are noticeably skewed to one of the sides from the center, adjust by turning the windage/elevation adjustment knobs RIGHT & UP as needed. Repeat control shots until the aiming point matches the center of target. Remember: one click equals 20 mm (3/4 inch) at a distance of 100 meters (110 yards).

RETICLE AS A RANGEFINDER

The range finder reticle in your SENTINEL was designed to assist you in determining the range of your target.

The range can be determined using marks (chevrons) on horizontal line as well as bars on vertical line of the reticle.

Note: To utilize this feature, the SENTINEL needs to be sighted at 50 meters (55 yards).

HORIZONTAL SCALE

If a 0.5 meter (1.6') wide target fits between the two closest center marks on the horizontal line of the reticle, the target is 50 meters (55 yards) away.

If the same target fits between the marks located just beneath the horizontal line of the reticle, the target is 100 meters (110 yards) away.

If the same target fits between the marks located above the horizontal line of the reticle, the target is 25 meters (27 yards) away. Please see a drawing below.

VERTICAL SCALE

The four short horizontal bars are located on the main vertical line. If a 0.5 meter (1.6') high target fits between the top marks and the bottom mark right below the horizontal line, the target is 25 meters (27 yards) away.

The other two horizontal bars on the vertical line correspond to 50 meters (55 yards) and 100 meters (100 yards) accordingly.

Note: If the determined range is 100 meters (110 yards), aim at the center of the target using the horizontal bar below the center crosshairs.

Note: It is possible to select the color of the reticle of the SENTINEL.

Red is best when used in clear viewing conditions. Green is preferable for use when viewing is obscured.

SIGHTING IN THE SENTINEL

Warning: Be sure to follow proper safety instructions provided by the weapon manufacturer or vendor. 

To test the scope in a lighted area, protect the intensifier by keeping the lens cover over the objective lens of the scope. Regardless of being in the “ON” or “OFF” position, the IR illuminator will not have any effect in a lighted environment.

Note: The sighting of the scope should be performed under the same environmental and temperature conditions as the ones that the scope will be exposed to during its use.

In case when the aiming point (the center of the reticle) does not match the center of target, adjust by turning the windage/elevation knobs (11) RIGHT & UP until the aiming point (the center of the reticle) matches the center of target.

Take 3-4 control shots trying to be as accurate as possible aiming at the center of the target.

Examine the results. If the results are noticeably skewed to one of the sides from the center, adjust by turning the windage/elevation adjustment knobs RIGHT & UP as needed. Repeat control shots until the aiming point matches the center of target. Remember: one click equals 20 mm (3/4 inch) at a distance of 100 meters (110 yards).

RETICLE AS A RANGEFINDER

The range finder reticle in your SENTINEL was designed to assist you in determining the range of your target.

The range can be determined using marks (chevrons) on horizontal line as well as bars on vertical line of the reticle.

Note: To utilize this feature, the SENTINEL needs to be sighted at 50 meters (55 yards).

HORIZONTAL SCALE

If a 0.5 meter (1.6') wide target fits between the two closest center marks on the horizontal line of the reticle, the target is 50 meters (55 yards) away.

If the same target fits between the marks located just beneath the horizontal line of the reticle, the target is 100 meters (110 yards) away.

If the same target fits between the marks located above the horizontal line of the reticle, the target is 25 meters (27 yards) away. Please see a drawing below.

VERTICAL SCALE

The four short horizontal bars are located on the main vertical line. If a 0.5 meter (1.6') high target fits between the top marks and the bottom mark right below the horizontal line, the target is 25 meters (27 yards) away.

The other two horizontal bars on the vertical line correspond to 50 meters (55 yards) and 100 meters (100 yards) accordingly.

Note: If the determined range is 100 meters (110 yards), aim at the center of the target using the horizontal bar below the center crosshairs.

Note: It is possible to select the color of the reticle of the SENTINEL.

Red is best when used in clear viewing conditions. Green is preferable for use when viewing is obscured.

INSPECTION

It is recommended to inspect the SENTINEL before each use for:

·        Body condition; cracks, deep dents and corrosion are not acceptable.

·        Check that the scope is firmly attached to the rifle.

·        Objective lens, eyepiece and IR illuminator condition; cracks, finger marks, dirt, water drops and other stains are not acceptable.

·        Make sure not to use depleted batteries or batteries that show stains of electrolyte, salt or acid leaks; these conditions may result in damage to the scope.

·        Check that the power switches (3) and the reticle brightness knob (4) are functioning normally.

·        Check that the objective lens ring (6) and the eyepiece ring (7) are movable. 

MAINTENANCE

It is recommended that technical maintenance should be performed on the SENTINEL at least 2 times a year; tasks for technical maintenance include:

To clean the exterior of the scope of dust, dirt and moisture using a dry tissue with a few drops of gun oil or similar substance applied.

To clean the electrical contact lead located in the battery housing using pure alcohol.

To examine the lenses of the eyepiece, objective lens and IR illuminator and blow off sizable particles of sand and dust; clean the lenses only if necessary.

Do not pour liquids directly onto the lens surface when cleaning; apply solution to a clean, dry cloth and then proceed to clean the lens.

Warning: Please use extreme caution when handling hazardous substances, such as alcohol.

THE SENTINEL MAGNIFIER LENS 2.5x50

The NVRS magnifier lens attachment accessory (#29091) helps increase magnification of the SENTINEL with an objective lens diameter of 50mm up to 1.75 times. Screw the magnifier lens onto the objective lens of the scope according to the instruction manual for the “NVRS 2.5x50 Doubler”. Sight in the scope after the magnifier lens is attached due to movement of the reticle.

ADDITIONAL WEAVER MIL-STD-1913 RAILS

The SENTINEL has an additional Weaver rail (12) on the left side of the body. With the help of this mount it is possible to install:

·        The Yukon IR Flashlight with mount (# 29072);

·        The Yukon Directional Microphone with NVRS adapter (# 27022).

STORAGE

Always keep the scope in its carrying case in a dry, well ventilated space.  Storage temperature should not be below +10°С (+50°F), and humidity no higher than 70%. Remove the batteries if the scope will not be used for more than 1 month.

TROUBLESHOOTING

Listed below are some potential problems that may occur when using the SENTINEL. Carry out the recommended checks and troubleshooting steps in the order listed. Please note that the table does not list all of the possible problems. If the problem experienced with the scope is not listed, or if the suggested action meant to correct it does not resolve the problem, please contact the manufacturer.

Problem	Possible cause(s)	Corrective action
The riflescope does not turn on.	The batteries have been installed incorrectly.	Reinstall the batteries with the correct polarity orientation.
	The total battery charge is less than 2.0 V.	Install fresh batteries.
	Oxidized contact points in the battery compartment due to “leaky” batteries or contact points becoming exposed to a chemically reactive solution.	Clean the battery compartment, focusing on the contact points.
The red reticle is blurred and can not be focused with the eyepiece.	The eyepiece is not adjusted correctly.	Adjust the eyepiece according to the instructions in the “OPERATING THE SENTINEL” section.
With a crisp reticle image, the image of the target at least 30m away is blurred.	The eyepiece is not adjusted correctly.	Adjust the eyepiece according to the instructions in the “OPERATING THE SENTINEL” section.
With a crisp reticle image, the image of the target at least 30m away is blurred.	Dust and moisture are covering the outside optical surfaces.	Clean the lens surfaces with a soft cotton tissue or cloth.
	Condensation collects on the inside of the objective and the eyepiece lenses, or is on the optical surfaces of the electronic- optical converter, and may be caused by the scope fogging due to a rapid change in temperature; for example, when the scope is brought from a cold into a warm environment.	Let the unit dry by leaving it in a warm environment for 4 hours.
Distinct black dots or specks on the screen while the image is focused.	The dots are cosmetic blemishes resulting from IIT production processes and do not interfere with the reliability or performance of the scope; the size of the dots are specified in the technical requirements for IIT's and the scope itself.	No need to take corrective action or return the scope.
The scope or the IR do not turn off via the “ON/OFF” switch on the scope.	The scope was activated by remote control.	Turn off the scope and the IR by using the remote control.
The displacement of the reticle while shooting.	The scope is not mounted securely.	Check that the scope is firmly attached to the mount and make sure that the same type and caliber bullets are being used as when the scope was initially sighted in; if the scope was sighted in during the summer, and is now being used in the winter, or vice versa, a small displacement of the aiming point is possible.
The scope does not focus.	Wrong settings.	Adjust the scope according to the instructions in the “OPERATING THE SENTINEL” section and check the eyepiece and objective lens condition; if necessary, clean the lenses of dirt, dust, condensation, frost, etc. to prevent fogging in cold weather and apply a special anti-fog solution.