Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter User Manual download pdf (Page 101)

Description: Installation and Operation Manual Addendum

Series TFX Heat Flow Meter

Origin Date: 02/10/00 Revision: none Revision date: none Page 1 of 3

Addendum — Heat Flow

Dynasonics Series TFX Heat Flow

General

The TFX flowmeter with the optional heat flow module installed is designed to meas-

ure the rate and quantity of heat delivered to a given building, area or heat exchanger.

The instrument measures the volumetric flow rate of the heat exchanger liquid (water,

water/glycol mixture, brine, etc.), the temperature at the inlet pipe and the temperature

at the outlet pipe. Heat delivery is calculated by the following equation:

Rate of heat delivery = Q*(Tin – Tout)*c

Where

Q = volumetric flow rate

Tin = temperature at the inlet

Tout = temperature at the outlet

c = specific heat of the liquid

The RTD module installed in the TFX measures the differential temperature of two

1000-ohm three-wire platinum RTDs. The three-wire configuration allows the tem-

perature sensors to be located several hundred feet away from the TFX meter without

influencing system accuracy or stability. The TFX transit time flow meter can also tol-

erate large distances between the flow measurement transducers and the electronic

instrument.

The RTDs included with the TFX heat delivered flowmeter have been factory cali-

brated and are marked with an identification as to which terminal, #1 or #2, the RTD

has been calibrated. The RTDs are 1000-ohm platinum and are designed to be

mounted on the exterior surface of the pipe. The RTDs are rated for a temperature

range of –50 to +130 C.

Installation

1. Follow the instructions outlined in the standard TFX manual for proper installation

of the flow measurement transducers. After installation, verify that the Signal

Strength is greater than 4-5% and, if possible, perform a Zero flow calibration on

the pipe. Please note that all readings require a full pipe of liquid.

2. Select areas on the inlet and outlet pipes where the RTDs will be mounted. Re-

move or peel back the insulation all the way around the pipe in the installation

area. Clean an area slightly larger than the RTD down to bare metal on the pipe.

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Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter User Manual Page 101