Configuring the solid state relay as alarm output:
1. Make sure the meter is in “flow” display mode. The MENU push button is used to
toggle between the “flow” and “temperature” displays. When in “flow” mode, either
the GPM or the LPM LED lights up (both °F and °C LEDs will be off).
2. Press and hold MENU.
3. “FLo” is displayed, followed by either “PUL” (for pulse output) or “ALA” (for alarm
output).
4. Release the MENU push button.
5. If “ALA” is displayed, press the SET push button.
6. If “PUL” is displayed, use the MENU push button to change it to “ALA”, then press
the SET button.
7. The 3-digit value that is displayed is the alarm set point (as stored in the memory).
8. Use the MENU button to change the alarm set point, if needed.
Note 1:
When MENU is pressed once, the display increments to the next value. If
the MENU button is held down, the display will initially increment slowly, then
increment more quickly until the maximum allowed set point is reached. It will then
roll over to 0 and start from the minimum set point again. Please refer to Table 1 for
the range of acceptable flow set points for each flowmeter size.
Note 2:
When the set point is 0, the flow alarm is disabled.
9. Press the SET push button to store the new set point in the memory.
10.The LED then displays either “nc” (normally-closed) or “no” (normally-open). This
is the state of the relay when there is no flow alarm.
11. Use the MENU push button to toggle between “nc” and “no”.
12. Use the SET push button to store the new relay configuration in memory.
Alarm Relays and Pulse Output
Both CP and CT models can be configured by the user to transmit either a flow alarm
signal or a scaled-pulse output. An internal solid-state relay (SSR) is shared between
the flow alarm and pulse output.
Model CT has an additional SSR (independent of flow) for transmitting the temperature
alarm.
The user menu is entered by pressing (and holding) the MENU push button. In this
mode, all subsequent selections must be made within 5 seconds of each other. A
period of inactivity (not touching the push buttons) longer than 5 seconds results in
the meter’s reverting back to normal run mode, without storing the new selection in
the memory.
Note:
The “LSP” and “HSP” relay contacts are independent of each other and can be
set to “nc” or “no” for the flow alarms. When either or both of the alarms are on, the
alarm LED will blink.
Configuring the solid state relay as pulse output:
In order to configure the flowmeter for scaled-pulse output, proceed as follows:
1. Make sure the meter is in “flow” display mode. The MENU push button is used to
toggle between the “flow” and “temperature” displays. When in “flow” mode, either
the GPM or the LPM LED lights up (both °F and °C LEDs will be off).
2. Press and hold MENU.
3. “FLo” is displayed, followed by either “PUL” (for pulse output) or “ALA” (for alarm
output).
4. Release the MENU push button.
5. If “PUL” is displayed, press the SET push button.
6. If “ALA” is displayed, use the MENU push button to change it to “PUL”, then press
the SET button.
Pulse Output:
There is an output pulse proportional to flow “rate” as well. The pulse
output always indicates flow in GPM. It is driven by an internal solid-state relay with a
10K pull-up resistor to supply voltage (pulse width = 3 msec). It should be noted that
the pulse output represents instantaneous flow rate, not an averaged value. Therefore,
flow jitter may be present when an external rate indicator is used, unless the indicator
is capable of filtering or signal averaging.
The totalizer resolution and the corresponding flow rate pulse output depend on the
full-scale setting of the flowmeter, as follows:
Configuring the Temperature Alarm
Only model CT can be configured by the user to transmit a temperature alarm.
An internal solid-state relay (independent of flow) is used as a “high alarm” for
temperature, meaning that the alarm signal is transmitted when the temperature set
point is exceeded.
In order to configure the temperature alarm output, proceed as follows:
1. Make sure the meter is in “temperature” display mode. The MENU push button is
used to toggle between the “flow” and “temperature” displays. When in
“temperature” mode, either the °F or the °C LED lights up (both GPM and LPM
LEDs will be off).
2. Press and hold MENU.
3. “t” is displayed, followed by “AL”.
4. Release the MENU push button.
5. The 3-digit value that is displayed is the alarm set point (as stored in the memory).
6. Use the MENU button to change the alarm set point, if needed.
Note 1:
When MENU is pressed once, the display increments to the next value. If
the MENU button is held down, the display will initially increment slowly, then
increment more quickly until the maximum allowed set point is reached. It will then
roll over to 0 and start from the minimum set point again. Please refer to Table 2 for
the range of acceptable temperature set points.
Note 2:
When the set point is 0, the temperature alarm is disabled.
7. Press the SET push button to store the new set point in the memory.
Note:
The state of the SSR (“nc” - normally-closed) or (“no” - normally-open) is
the same as the flow alarm relay, and can only be changed in the flow alarm menu,
regardless of whether the meter is configured for flow alarm or flow pulse output. In
other words, in order to select “no” or “nc” for temperature alarm relay, you must
repeat Steps 1-12 under “Configuring the Flow Alarm”. Later, if the meter is re-
configured for scaled-pulse output (flow), it does not affect the temperature relay
state.