Owner manual

Rev. 2/00 -3.5- 300/301
Figure 2.3 D301/300 Operated with 12-24 Vdc Power Supply
02/02/2000
R110 [DAMP] Control
Adjust R110 [DAMP] to stabilize flow rate and output readings. Adjust CCW to in- crease the response of the instrument; adjust CW to decrease response time (smooth the display readings and outputs).
CTR Output Connections
The CTR output is designed to operate both electronic and electromechanical totalizers. The output can drive loads as low as 90 ohms. Control R90 [CTR] adjusts the span of this output. Switch set SW1 controls the CTR output by factors of X10. See details in the manual describing CTR adjustment.
Isolated 4-20mA Output Connections
There are two methods to connect this output: •
To operate the 4-20mA loop from the same DC supply operating the flow meter, connect jumper wires from +B/12V to 4- 20+ and from GND to ISOGND. Connect the 4-20mA loop load between 4-20+ and 4-20-.
•
If the target’s (chart recorder, datalogger, etc.) internal DC power source is utilized to power the 4-20mA loop, Connect the ISOGND terminal to the target’s ground, the target’s +DC output to 4-20+ terminal and the target’s 4-20mA input to the 4- 20mA– terminal.
Control R100 [4mA] is used to adjust 4mA off- set and R50 [20mA] to adjust 20mA span.
Flow Rate Relay Connections
The D300/D301 is equipped with a flow rate control relay. The relay is designed to control loads to 250 Vac and 10A. The relay activates when the flow rate is less than the set point. Activation is indicated by D23 [LED]. The relay setpoint is controlled by adjusting R70 [ALM] there is also a alarm delay feature that requires the alarm condition to be present for a period of time before relay activation. The delay can be increased by adjusting R80 [DELAY] CW.
Power Supply Jumper Placement
12-24 Vdc Does not matter
Fuse
The fuse provides protection for AC powered units only. DC power sources should be connected with a 0.25A current limiter [fuse] in the positive supply line.
12-24 Vdc Power Connections
Connect a DC power source capable of sourc- ing 0.2A to the terminals marked +B/12V and GND. The DC power source will operate all functions of the D300/D301 except the iso- lated 4-20mA output. See the box describing Isolated 4-20mA Output for connection details.
0-1 mA Output Connection
This output is designed to drive loads up to 1500 ohms. Use R60 [1mA] control to adjust span.
Transducer Connections
Connect the four wires from the two coaxial cables to the respective terminals. Wire markers on the coaxial cables identify the “R” and the “T” pair. Do not run these cables adjacent to AC power cables.
R10 [GAIN] Control
After all electrical and transducer connections have been made, the GAIN control is set to match liquid and pipe parameters. To prop- erly set the R10 [GAIN], the pipe must be full
of a flowing liquid. Start with the control fully
CCW [counter clockwise]. Adjust CW until D21 [the LED] just begins to flash steadily.
LOW Velocity Filter
For measuring fluid velocities up to 20 FPS [6 MPS] set the two switches at SW2 to OPEN. If continuous flow rate will not exceed 2 FPS [0.6 MPS] turn the two switches ON.