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Troubleshooting the Venture/Aaliant Target Meter

The following applies to Aaliant/Ramapo target meters using a 1050 signal transmitter. Customer complaint - I wired the unit to my electronic display and nothing works. I have checked the display as a separate item and it works. This complaint is almost always because there is nothing going through the meter or because the 1050 is not wired properly. Case 1 - The receiving device accepts pulses, a typical receiver would be a Kessler-Ellis MiniTrol, BatchTrol, KepTrol, etc. 1. Look at the wiring going from the 1050 to the receiver. There should be 3 wires connected to terminals marked P OUT, V IN and GND. Shielded wire should be used, with the shield drain wire going to a physical ground connection, not the terminal marked GND. 2. Are the 3 wires properly connected? The wire coming to V IN goes to the + side of the power supply. ( On a KEP MiniTrol - terminal #7. ) The wire coming to P OUT goes to the + input terminal. ( On a KEP MiniTrol - terminal #5. ) The wire coming to GND goes to the - side of the power supply. ( On a KEP MiniTrol - terminal #8. ) If your power supply is separate from the display, connect the (-) side of the power supply to the (-) side of the input signal on the receiver. ( On a KEP MiniTrol - not necessary, internally connected. ) Check the shield - The shield wire should only be connected to the 1050, not the receiving device. Case 2 - The receiving device accepts 4-20 madc signals, typically a Kessler-Ellis Intellect or BatchTrol/KepTrol equipped with a 4-20 input card. 1. Look at the wiring going from the 1050 to the the receiver. There should be 3 wires connected to terminals marked I OUT, V IN and GND. Shielded wire should be used, with the shield drain wire going to a physical ground connection, not the terminal marked GND. 2. Are the 3 wires properly connected? The wire coming to V IN goes to the + side of the power supply. ( On a KEP Intellect 69 - terminal #7. ) The wire coming to I OUT goes to the + input terminal. ( On a KEP Intellect 69 - terminal #4. ) The wire coming to GND goes to the - side of the power supply. ( On a KEP Intellect 69 - terminal #3. ) If your power supply is separate from the display, connect the (-) side of the power supply to the (-) side of the input signal on the receiver. (On a KEP Intellect 69 - not necessary, internally connected.) Check the shield - The shield wire should only be connected to the 1050, not the receiving device. General notes 1. After installation, the target meter must be zeroed for proper calibration. The instruction sheet that came with the unit has a detailed step-by-step explanation of how this is done. 2. The pulse output of the target meter is almost always a nominal 0-1000 Hz signal. The calibration sheet that comes with the target meter has a specific value, i.e. under CAL values, Freq. out = some number. The number given is the frequency which corresponds to whatever span the unit was calibrated. From this information you need to calculate the K-Factor setting for the pulse input receiver. For example: Freq out = 938 Hz Full scale flow is 1000 pph steam    938 pulses               Hour                3600 seconds               3376.8 pulses ------------------ x ------------- x ----------------------- = ------------------------       second                1000 Lb                    Hour                             Pound However, if your receiver was counting pounds, it would rather quickly reach all 9's and roll over to zero. Accordingly, in this case it would be logical to use a x100 multiplier, in which case the K-Factor would become:    3376.8 pulses               100            337680 pulses ----------------------- x --------- = -------------------------        Pound                        100              100 Pounds

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