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19
GF 9950-10 Six Channel Transmitter
• Volumetric Pulse
The relay will activate for the set pulse width once the speci
fi
c
volume of
fl
uid is registered. Flow Inputs only.
NOTE:
Relay LEDs will turn on when the relay is active
• Totalizer Volume
Relay activates and latches when a speci
fi
ed volume of
fl
uid is
registered on the resettable totalizer. For Flow inputs only.
Total Volume mode counts the TOTALIZER Units until the
setpoint volume is reached, then turns on the relay until the
resettable totalizer is reset.
If the Resettable Totalizer reading is greater than the setpoint,
the relay will be turned on immediately. The relay will be off
when the totalizer is below the set point or the resettable
totalizer is reset to zero.
This mode is useful to trigger a reminder when a process is
due, as for a backwash cycle or
fi
lter change.
• Pulse Width Modulation
PWM automatically varies the ratio of ON time to OFF time
proportional to minimum and maximum range settings.
The relay period is the sum of the time a relay is ON and the
time it is OFF.
Relay pulse width is the time the relay is ON.
The 9950 must be programmed with the relay period, and with
the low and high setpoints.
NOTE:
The PWM mode is not used for Pressure applications.
Relay LEDs will
fl
ash in PWM mode.
0%
20%
40%
60%
80%
100%
Process value
PWM
Maximum
Range
Relay is
always ON
Relay is
always OFF
Relay Pulse Width
(as a % of Relay period)
PWM
Minimum
Example:
• The pulse width will be 0% of the relay period
(relay always OFF) when the process value is
less than the minimum range.
• The pulse width will be 100% of the relay period
(relay always ON) when the process value is
greater than the maximum range.
• The pulse width will be 60% of the relay period when
the process value is at 60% of the span between the
minimum and maximum range.
Relay Modes
NOTE:
The pulse width will be 100% of the relay period
(relay always ON) when the process value is greater than the
maximum range.
Relay Mode - ERROR
00.00
15.00
00.00
00.00
CH1
_ _ _ _ ._
9999.9
CH2
mV
GPMS
pH
°F
7 .0
6 2 .8
NO SENSOR
Error Mode
When the relay "Error" mode is assigned to a sensor,
any of the following sensor-related errors will activate the
relay and turn the screen "RED" with the appropriate error
message.
•
Wrong sensor connected
•
No response from a sensor, e.g. a missing sensor or a
broken wire
•
Sensor returning a measurement error (for pH and ORP,
a missing probe will cause this)
•
An out-of-range measurement value from the sensor
•
An expired Dissolved Oxygen cap
•
A missing Dissolved Oxygen cap
•
A pH electrode whose glass impedance is less than or
equal to the user-speci
fi
ed broken glass limit
•
A conductivity module that is compensating the wire
length and is not returning a measurement
•
A missing module
•
The wrong module inserted into the slot