Casella CEL CEL-177 - Manual (Page 4)

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031-2839
www.casellausa.com Page 4 of 6 tel: ( 800) 366-2966
[email protected] 28 Jan 2006 fax: (603) 672-8053
Effect of battery voltage - Over the working
battery range, as indicated by the indicator lamp,
the sound pressure level is maintained within
that indicated in Table 1 ±0.2dB. The frequency
stability of the 1kHz tone and therefore the dose
time are accurate to ±0.5%.
Effect of temperature - For the temperature
range 10ºC to +30ºC the variation in sound
pressure level is less than ±0.4dB. Variation in
frequency and dose time is better than ±0.5%.
Effect of pressure - Normal variations of air
pressure will have negligible effect but figure 2
shows the variations that may be expected if
calibration is performed at high altitudes.
Care and Maintenance procedure.
The CEL-177 requires very little routine
maintenance. If difficulty is experienced in
inserting the microphone a small amount of
silicone grease should be used on the 0 rings in
the calibrator. Also, it is possible after a large
number of insertions that the 0 rings lose some
elasticity. Therefore, if the microphone is not
firmly held in the cavity the 0 rings should be
replaced.
To prevent damage by battery acid the battery
should always be removed when storing the
calibrator.
Manufacturer's Servicing And Warranty
Arrangements
Each instrument has been carefully inspected
and calibrated prior to dispatch from our factory
in order to ensure its rigid conformity with the
requirements of our specification. All technical
information relating to individual instruments is
filed under the instrument's serial number. It is
important, therefore, to always quote this
number in any correspondence with the
manufacturers. The serial number is located on
the back of the instrument. The manufacturers
undertake to rectify any defect in the instrument
that is directly attributable to faulty design or
assembly and which becomes apparent during
the first twelve months from the date of the initial
calibration.
Many of the specialized components used in the
instrument are subject to separate warranties by
their actual manufacturers and in all cases benefit of these undertakings will be passed
onto the end user. However, Computer
Engineering's (CEL’s) liability is limited to items
of their own manufacture and they do not accept
liability for any loss resulting from the operation
or interpretation of the results from this
equipment.
In the event of a malfunction developing the
instrument should be carefully packed and
returned to either the manufacturer's agent in
the territory or, in the case of domestic sales, to
our Hitchin factory along with a detailed
description of the fault. The necessary repairs
will be undertaken and the instrument returned
as soon as possible.
After the warranty has expired, except on
approved accounts, service work is undertaken
against quotation and all packing and transit
costs are charged extra. In the case of sales in
the UK, service contracts are available for the
instruments and full details of these are
available on request.
Specification
Sound pressure level
Nominally 114dB
±0.4dB
(see also Figure 1)
Operating Mode Continuous & Timed
Dose time 65.5 sec ±0.5 sec
Frequency 1kHz ±5%
Voltage 100 mV rms ±1 mV
Dimensions 118mm x 45 mm
(4.65” x 1.75")
Weight 7.92 ounces (225g)
Power Consumption 10 mA approx. 7V-10V
Temperature Range 10-30 ºC (50-86 ºF)