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LQ500
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| CVVS | |
| Ec+ | Conductivity | |
RF part |
| signal input | |
Ec- | |||
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| FG | CVVS | |
| Tx+ | ||
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| Tx- |
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| Rx+ |
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| Rx- |
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| SG | Communication cable | |
| FG | ||
| +24V | CVVS | |
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| 0V | Power supply cable | |
| FG |
| Converter |
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| L1 | CVV | |
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Tx+ | L2 |
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TX- |
| CVVS | |
Rx+ | AO+ | ||
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Rx- | AO- |
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SG |
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DI3 |
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FG |
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DI2 |
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+24V |
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COM2 |
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0V | DO1 |
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FG |
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COM1 |
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| DI |
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| COM | CVV | |
| FG |
Power supply 100 to 240 Vac, 50/60Hz
Ground terminal (PE)
(Ground resistance 100 ohm or less)
Density (consistency) measurement output
Density multiplier switching voltage inputs
(H level: 20 to 30 Vdc, L level: 2 Vdc or less and Input
resistance: Approx. 3k ohm)
Density (consistency) measurement output
External synch. Control contact signal input (Contact capacity: 24Vdc, 0.1 to 1A)
Chassis ground terminal
(Ground resistance 100 ohm or less)
Ground terminal
(Ground resistance 100 ohm or less)
Notice 1: Do not connect to the “FG” terminals neither communication cable nor power supply cable in the detector side.
Notice 2: Either “PE” terminal on the terminal block in the converter on the chassis ground terminal of the unit should be grounded with 100 ohm or less ground.
Notice 3: Ground the shielded cable on the receiving instrument side.
Notice4: UL/CUL Hazardous locations type does not have a power switch. Please prepare a power switch outside. (Rated 250V AC,10A above, DPST:
Use the power switch for Hazardous locations in Hazardous locations area.
Figure 8. External connections
(8)As the cable port is made
(9)Screws at the terminals are needed to tighten with 1.2 N·m torque (1.4 N·m is maximum).
(10)Do not turn on the power supply under the uninstalled condition.
(11)Each cable in the communication cable and power supply cable between detector and converter has a banded marks for each terminals. Connect them correctly without any mismatches.
•Wiring when communications function is used By connecting the cable lead of the optional AF900
1)Make sure the load resistance of
2)The AF900’s cable lead can be connected to
the LQ500 anywhere along the current output line. For example, the cable lead may be connected to the signal terminals on the receiving side in the control room. See Figure 9.
LQ500 converter | Control room |
Density meter output Instrument (load)
AF900 (option)
Figure 9. Wiring for communication function
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