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TB1 terminal block description
Refer to
Table 3
for descriptions of the low-voltage TB1 terminals.
Pin/signal
Description
Special output
Not used. Do not connect to this pin.
Liquid level
Sends a signal to the sampler
controller to start or continue a
sampling program.
Liquid level input—Start or continue
the sampling program. A simple float
level switch can supply input.
Auxiliary control input—Start a
sampler after the sampling program
on another sampler ends. As an
alternative, start a sampler when a
trigger condition occurs. For example,
when a high or low pH condition
occurs, the sampling program starts.
Program
Not used. Do not connect to this pin.
complete
12/15 VDC
Sampler controller power supply
positive output. This output must be
used with common.
Pulse,
These two pins are connected as one
Pulse/mA
input.
input
This input is a sample collection
trigger from the flow meter (pulse or
4–20 mA) or a simple floating (dry)
contact closure.
1
Long-term operation in this state voids the warranty.
2
Source impedance of the driving signal must be less than 5 kΩ.
16 English
Table 3 TB1 terminal block description
Rating
Termination (pulled high): internal +5 V supply through
an 11 kΩ resistance with a series 1 kΩ resistor and
7.5 V zener diode terminated to common for protection.
Trigger: High to low voltage with a low pulse of
50 milliseconds minimum.
Absolute maximum input: 0 to 15 VDC with respect to
common. Signal to make the input active: external logic
signal with 5 to 15 VDC power source. The drive signal
must be typically high. The external driver must be able
to sink 0.5 mA at 1 VDC maximum at the logic low level.
A logic high signal from a driver with a power source of
more than 7.5 V will source current into this input at the
rate of: I = (V – 7.5)/1000 where I is the source current
and V is the power supply voltage of the driving logic.
Dry contact (switch) closure: 50 millisecond minimum
between liquid level and common. Contact resistance:
2 kΩ maximum. Contact current: 0.5 mA DC maximum
This output has a 250 mA fuse for protection.
Pulse input—Reacts to a positive pulse with respect to
common. Termination (pulled low): common through a
series 1 kΩ resistor and 10 kΩ resistor. A 7.5 zener
diode is in parallel with the 10 kΩ resistor as a
protection device.
Analog input—Reacts to the analog signal that enters
pulse/mA input and returns on common. Input burden:
100 Ω plus 0.4 V; Input current (internal limit): 40 to
50 mA maximum
Absolute maximum input: 0 to 15 VDC with respect to
common.
Signal to make the input active: 5 to 15 V positive-going
pulse
minimum.
Dry contact (switch) closure of a minimum 50 ms
duration between 12/15 VDC and pulse/mA input.
Contact resistance should be less than 5 kΩ. The
contact current will be less than 8 mA DC.
—
—
1
2
with respect to common, 50 millisecond
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