This tab of the Site window displays the settings that flow measurement instruments use to control a connected sampler.
These flow measurement instruments can control two sampler functions - sampler enable and sampler pacing.
Sampler Enable
Set up the sampler enable by choosing one of the three options in the When to Enable box.• Always - sets the sampler inhibit line to always enable the sampler.
• Never - sets the sampler inhibit line to always disable the sampler.
• On trigger - controls the sampler inhibit line with a user-defined condition.
The On trigger setting requires a trigger to be set up.
Pressing the Change Enable button opens the Equation Builder to set up the trigger conditions. Once this has been entered, the trigger is displayed in the “Enable sampler when:” box.
Latch sampler enable - If this box is unchecked, the inhibit line will continue to toggle between enabled and disabled as the conditions change. When this box is checked, the inhibit line will keep the sampler enabled once triggered, even if the condition no longer exists. This state will not change until the Reset Latch button is pressed.
Disable plotter when not sampling - When this box is checked, the instrument’s plotter will only run when the sampler is enabled.
Block access to front panel - When this box is checked, front panel sampler enable changes are not possible and the flow meter displays a message stating that the access has been blocked.
Sampler Pacing
Control the sampler pacing by choosing one of the pacing options.• No sampler pacing - The flow logger or flow meter will not send flow pulses.
• Flow paced - paces the sampler at a rate proportional to the flow rate by using volume intervals. Use the Change Pacing button to set the interval.
• Trigger paced - paces the sampler at a time interval that can change according to a triggered condition.
To set up trigger paced sampling:
1. Select the Trigger paced radio button. The Time paced interval box becomes active.
2. Enter the When trigger is true interval in minutes. This is the pacing interval while the trigger condition is met.
3. Enter the When trigger is false interval in minutes. This is the pacing interval while the trigger condition has not been met.
4. Set the trigger by pressing the Change Pacing button.
Build the trigger in the Equation Builder.
5. Press the Apply button.
Flow Pulse
Use this window to set the flow pulse interval. A flow pulse is a 50 millisecond pulse used to pace a sampler. Enter a value within the minimum and maximum range listed.It is important that this setting and the sampler’s pulses between sampling events setting work together to produce the desired volume interval. For example, if the flow meter sends a flow pulse every 100 gallons, and the sampler takes a sample every 10 flow pulses, the actual volume between samples is 1000 gallons.
Units - 4100/4200/
6700
From the Units tab of the Site window, you may select the units of measure for the data types reported by your Isco instrument.
Active data types have a pull-down list. Select one of the available units of measure, and click Apply to save the change.
Note: After readings are stored in the Flowlink database, they can be converted to other units of measure in a graph or table.
Alarms - 4100/4200/
6700
The Alarms tab of the Site window supports Isco instruments that have the factory-installed telephone modem with voice messaging. When a user-defined alarm condition is met, Flowlink notifies the contacts in sequence until an acknowledgment is received.
To setup a dialout alarm:
1. Connect to the instrument.
2. Select the Alarms tab.
3. In the Phone number list box, type the contact telephone numbers.
You must enter at least one number; you can enter as many as five numbers; you can enter the same number more than once.
Each telephone number string can contain up to eighteen characters. You can use dashes or leave them out. You can include the pause (“,” or comma) Hayes AT command in the number. The pause is preset as a two second delay.
You can also use the following commands:
@ (wait for silence) W (wait for dial tone) T (tone dial)
P (pulse dial)
4. In the Site ID text box, type an easily remembered number that you can associate with the flow meter. The modem uses this number in its alarm message.
When the ID box first appears, Flowlink automatically fills it with the last three digits of the Instrument ID number; you can use this number or enter another. (This number is used to acknowledge the alarm call using a touch-tone telephone. Press *(star) and the ID number and the instrument will respond with “Acknowledged.”) 5. Type the time between calls in the Delay Between Calls
text box.
The delay can be as long as 127 minutes. Remember that the modem calls the next contact number only when the previous call is unacknowledged.
6. To use the call-back feature, check the Enable Call Back check box. Pagers are convenient to list in the contact
phone number list, but they usually cannot acknowledge the alarm in the manner above. When the call back feature is enabled, the instrument will accept any incoming call as an acknowledgment.
7. To define the alarm condition, press the Set Alarm button.
When you’ve completed the trigger equation, it appears in the Trigger alarm when box.
8. Click Apply to save the changes.
Site Matching
As Flowlink connects to a 4100/4200/6700 site, it compares the instrument’s Site Name, Model number, and the Instrument ID with the information stored in the database. If any of these three items do not match, Flowlink displays the Site Does Not Match window.If you wish to continue with the connection, Flowlink needs instructions on how to handle the discrepancy. Choose one of the following options and click OK.
• Cancel this operation (either select another site before connecting or use Quick Connect). This cancels the connection and neither the database nor the instrument information will be changed. Using the recommended Quick Connect will automatically connect to the
instrument and select the correct database site for you. If the database does not have a matching site, the Quick Connect method will create a new site in the workspace.
• Create a new site in the database for this
instrument. The instrument will appear as a new site in the Flowlink workspace.
• Write the database’s configuration into the instrument, overwriting what’s currently in the instrument. Flowlink writes the database’s site name and partition in the instrument. Use this option with caution - readings currently stored in the instrument are erased as the new partitions are set up in the
instrument.
• Write the instrument’s configuration information into the database, overwriting what’s in the database.
If you select either of the last two options above, check the following before continuing:
• Verify that you have initiated the connection from the correct site.
• Verify that Flowlink is connected to the desired instrument.
• Configure this instrument like another, similar instrument. When you select this option, it will enable the Select Instrument button. Click that button and select a similar type of instrument to apply settings from.