Campbell SR50AH Bedienungsanleitung

SR50AH

Sonic Ranging Sensor

Heater Option

Instruction Manual

Issued 26.8.08

Printed under licence by Campbell Scientific Ltd.

CSL 795

Guarantee

This equipment is guaranteed against defects in materials and

workmanship. This guarantee applies for twelve months from date of

delivery. We will repair or replace products which prove to be defective

during the guarantee period provided they are returned to us prepaid. The

guarantee will not apply to:

•Equipment which has been modified or altered in any way without the

written permission of Campbell Scientific

•Batteries

•Any product which has been subjected to misuse, neglect, acts of God

or damage in transit.

Campbell Scientific will return guaranteed equipment by surface carrier

prepaid. Campbell Scientific will not reimburse the claimant for costs

incurred in removing and/or reinstalling equipment. This guarantee and the

Company’s obligation thereunder is in lieu of all other guarantees,

expressed or implied, including those of suitability and fitness for a

particular purpose. Campbell Scientific is not liable for consequential

damage.

Please inform us before returning equipment and obtain a Repair

Reference Number whether the repair is under guarantee or not. Please

state the faults as clearly as possible, and if the product is out of the

guarantee period it should be accompanied by a purchase order.

Quotations for repairs can be given on request.

When returning equipment, the Repair Reference Number must be clearly

marked on the outside of the package.

Note that goods sent air freight are subject to Customs clearance fees

which Campbell Scientific will charge to customers. In many cases, these

charges are greater than the cost of the repair.

Campbell Scientific Ltd,

Campbell Park, 80 Hathern Road,

Shepshed, Loughborough, LE12 9GX, UK

Tel: +44 (0) 1509 601141

Fax: +44 (0) 1509 601091

Email: [email protected]

www.campbellsci.co.uk

Contents

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1. Heater Introduction .....................................................1

2. Specifications..............................................................1

3. Maintenance.................................................................2

Figures

1. SR50AH Heater option...............................................................................2

2. Complete transducer assembly with power connection..............................4

SR50AH Sonic Ranging Sensor Heater

Option

This manual describes the optional heater for the SR50A sensor. It is provided as an addendum

to the SR50A manual which should be referred to for general operating instructions.

1 Heater Introduction

The heater option on the SR50AH is intended for installations where rime ice is

problematic. The heater will help to prevent the ice from forming on the transducer,

which can impair proper operation of the sensor.

The heater option is easily identifiable as the transducer housing contains a cable port

for the heater supply cable.

For battery operated solar powered sites it is recommended that the power to the

heater be turned off when icing conditions are not occurring to reduce power

requirements. The heater power must be turned off when operating at temperatures of

25°C or more.

2 Specifications

Heater Resistance: 75 Ohms

Nominal Operating Voltage 12 Volts (AC or DC) Note1

Maximum Rated Wattage: 3 Watts

Maximum Rated Voltage: 15 Volts (AC or DC)

Maximum Operating Temperature: 25°CNote2

2.1 Heating Cable Requirements

Type: 2 conductor (twisted pair), Shielded

Diameter: 4-6mm (0.16 - 0.24 inches)

Recommended Gauge: 22 AWG for lengths less than 30 metres (100 feet)

1: It is important to use a properly conditioned low noise power source.

A noisy power source or use of unscreened cable may affect operation

of the sensor.

NOTE

SR50AH Sonic Ranging Sensor Heater Option

2: It is recommended that some form of control be used to turn the

heater power off at warmer temperatures. Damage to the sensor may

result from operation at elevated temperatures.

Figure 1 SR50AH Heater option

3 Maintenance

The same maintenance procedures apply to the SR50AH as the regular SR50A

sensor. Please refer to the SR50A manual for maintenance information.

The transducer and desiccant replacement is slightly different for the SR50AH as it is

for the SR50A. When ordering replacement transducers ensure that the SR50AH

part# C2370 is ordered.

The procedure to disassemble the SR50AH for desiccant replacement or transducer

replacement is as follows:

1. Remove the 6 slotted screws on the outermost hole pattern.

2. Separate the housing from the sensor body and disconnect the connector from

the transducer to the main sensor body.

NOTE

Cable port for heater option

Instruction Manual

3. To replace the desiccant remove the desiccant holder plate with the Philips 4-40

screw. Cutting the tie strap will allow the old packets to be removed for

replacement. During reassembly ensure that the desiccant does not come in

contact with the metal backing of the transducer. If only the desiccant is being

inspected or replaced, step 4 and 5 are not required. Steps 4 to 6 are required to

replace the transducer only.

4. Your transducer kit comes with a replacement for the o-ring that seats between

the main sensor body and the plastic transducer housing. Ensure that the new

o-ring is used when reassembled.

5. Remove the 3 screws from the innermost hole pattern as shown.

SR50AH Sonic Ranging Sensor Heater Option

1. Replace the transducer assembly and the second o-ring that seats under the

transducer assembly.

2. Reassemble the sensor in the reverse order. Please observe the orientation of the

parts, wiring and desiccant.

Figure 2 Complete transducer assembly with power connection

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