Aalborg PWM Paddle - Manual (Page 4)

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1. UNPACKING THE PWM
1.1 Inspect Package for External Damage
Your Paddle Wheel Meter was carefully packed in a sturdy cardboard carton, with anti-
static cushioning materials to withstand shipping shock. Upon receipt, inspect the
package for possible external damage. In case of external damage to the package
contact the shipping company immediately.
1.2 Unpack the Paddle Wheel Meter
Open the carton carefully from the top and inspect for any sign of concealed shipping
damage. In addition to contacting the shipping carrier please forward a copy of any
damage report to your distributor or Aalborg
7 directly.
When unpacking the instrument please make sure that you have all the items indicat-
ed on the Packing List. Please report any shortages promptly.
1.3 Returning Merchandise for Repair
Please contact the customer service representative of your distributor or Aalborg
7
if
you purchased your Paddle Wheel Meter directly, and request a Return Authorization
Number (RAN). Equipment returned without an RAN will not be accepted.
Aalborg
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reserves the right to charge a fee to the customer for equipment returned
under warranty claims if the instruments are tested to be free from warrantied defects.
Shipping charges are borne by the customer. Items returned "collect" will not be
accepted!
It is mandatory that any equipment returned for servicing be purged and neutralized of
any dangerous contents including but not limited to toxic, bacterially infectious, corro-
sive or radioactive substances. No work shall be performed on a returned product
unless the customer submits a fully executed, signed SAFETY CERTIFICATE. Please
request form from the Service Manager.
2. PWM PADDLE WHEEL METERS
2.1 Principles of Operation
PWM liquid flow meters consist of a meter body that is installed in-line in a conduit sys-
tem. Inside, between the inlet and the outlet connections is a rotary wheel with per-
manent magnets embedded at 180 degrees in paddles.
Fluid flowing through the meter causes the paddle to spin. A magnetic sensor picks up
the frequency of pulses, and the readings are proportional to the liquid flow taking
place. The number of pulses per unit time interval and a K-factor (pulses/unit of flow)
facilitate determining the volumetric rate of flow through the meter.