Owner manual

Rev. 2/00 -3.4- 300/301
Figure 2.2 D301/300 Operated with 115/230 VAC Power Supply
02/02/2000
R110 [DAMP] Control
Adjust R110 [DAMP] to stabilize flow rate and output readings. Adjust CCW to increase the response of the instrument; adjust CW to de- crease 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: •
When the D300/D301 is powered from AC power sources, 24 Vdc of isolated power is available at the 4-20mA+ terminal. Sim- ply connecting the target’s (chart recorder, data logger, ADC) 4-20mA+ and 4-20mA– inputs to these two output terminals will drive 4-20mA through 1000 ohms.
•
If the target’s internal DC power source is utilized to power the 4-20mA loop, Con- nect the ISOGND terminal to the target’s ground 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
115 Vac J2 and J3 only 230 Vac J4 only 12-24 Vdc Does not matter
Fuse
115/230 Vac 1/16A 3AG Delay Action
AC Power Connections
115/230 Vac 50/60 Hz clean AC power re- quired. Do not connect in parallel with circuits operating florescent lighting, valves, control relays, VFDs, etc. GND connection is op- tional. If GND is connected, verify that it is at the same potential as the piping system.
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 ad- jacent 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.