Unit installation

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model S-254 UV optical sensor

option

The optional S-254 UV optical sensor measures the

relative output of ultraviolet light within the UV

treatment chamber. Degradation of the UV lamps,

fouling of the quartz sleeves, water temperature

fluctuation and increased turbidity of the water will

all affect the sensor reading.

The UV meter assembly and instrumentation setpoint

potentiometers are located on the front of the electrical

enclosure. The peripheral alarm contacts are accessible

from the back side of the meter. A shielded signal cable

connects the sensor meter assembly to the sensor

probe. The sensor probe is located in the sensor port

fitting on the top of the UV treatment chamber in

Double-Ended, High-Temperature (HT) units and in the

endplate in Single Ended units.

All S-254 UV optical sensors are tested and preset at the

factory in free air. Setpoint adjustments are required at

installation and after each subsequent lamp changeout

cycle.

SETTING THE UV METERSETTING THE UV METER

SETTING THE UV METER

1. Gradually start the normal flow rate.

2. Bring the unit up to normal operating pressure.

3. Turn the UV lamps on

for a minimum of 15

minutes.

4. Adjust the potenti-

ometer sensitivity to

100%.

5. Adjust the potenti-

ometer sensitivity to

50%.

6. Adjust the potentiom-

eter alarm until the red

LED barely comes on.

7. Set the potentiom-

eter sensitivity back

to 100%.

8. Turn the potentiometer sensitivity to 50%; the red LED

should come on.

9. Turn the potentiometer sensitivity back to 100%.

Re-calibration must be performed after the first 100

hours of operation on new UV lamps, both at the time of

installation and each time the UV lamps are replaced.

ALARM CONTALARM CONT

ALARM CONT

CTS (CTS (

CTS (

optionaloptional

optional

))

)

Normally Closed and Normally Open alarm contacts are

also provided for use with user-supplied peripheral

equipment, such as remote alarms or solenoid valves.

Dry relay contacts are rated as follows: 0.52 AMP 120

VAC., 0.25 AMP 240 VAC

If your application requires higher contact ratings,

use a slave relay. Connection of peripheral equip-

ment is the responsibility of the user.

See the wiring schematic in back pocket of this manual

SENSOR ALARMSENSOR ALARM

SENSOR ALARM

The S-254 UV optical sensor provides information about

the relative amount of UV passing through the water.

The reading is affected by quartz sleeve fouling and/or

the germicidal lamp efficiency. The UV sensor is

sensitive to, and reflects changes in, UV transmission

when a substantial change occurs in the normal

operating flow rate, temperature, operating pressure, or

quality of the fluid flowing in the system.

When the UV intensity falls below the minimum

standard due to any of the above conditions, the sensor

alarm light (red LED) will come “on” and corrective

action must be taken to optimize the performance of the

UV treatment unit.

1. Examine your system for any significant changes in

normal operating conditions.

2. Check if all UV lamps are electrically operating and/

or need replacement. Verify the quartz sleeves are

clean.

If quartz sleeve fouling has caused the optical sensor

alarm to activate, the quartz sleeves must be cleaned. At

the same time, you must clean the sensor probe quartz

window. Please find this information in the maintenance

section of this manual.

S-254 UV Optical Sensor