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Totaling these, we get a minimum power supply requirement of 14 VDC. Allowing a margin of 0.5 Volts for the supply permits 25 ohms of lead wire resistance for remote installation. A typical 250 ohm load resistor drops 5.0 Volts 20 mA. Example: The transmitter requires 8.5 Volts minimum. Power Supply DC power supply requirements are determined by the transmitter’s minimum voltage requirement and voltage drop across the load resistor and installation lead wires.
![minco transmitter minco transmitter](https://i.ebayimg.com/images/g/MQwAAOSw-FZXkBLK/s-l400.jpg)
The Temptran has been factory-calibrated to its marked temperature range or to a specific RTD, do not change its Zero or Span adjustments. For the RTD, good connections are a must, a few ohms of resistance in the connection could cause an error of several degrees. The maximum DC supply should not exceed 35 VDC. The transmitter’s power and RTD connections are designed for non-polar hook-up, so polarity is not important. Connect the Temptran as shown in the wiring diagram below. Installation Locate the Temptran near the RTD, in an area where the ambient temperature stays between the temperature range of the output. Screw terminals, non-polar (connect either way).
![minco transmitter minco transmitter](https://www.machine--tools.com/By-Location-/Ohio-/Minco-temperature-transmitter-TT176D1V-c-w-rtd-sensor-img.jpg)
Output “Low” (3.3-3.7mA) with sensor shorted. Output “High” (22-28mA) with sensor open. For example, if the supply voltage is 24 VDC, the loop resistance must be less than 775 Ω. The maximum allowable resistance of the signal-carrying loop, including extension wires and load resistance, is given by this formula: Rloop max = (Vsupply-8.5)/.02 amps. ± 0.001% of span per volt from 8.5 to 35 VDC.
MINCO TRANSMITTER SERIES
Printed circuit board designed to mount inside the S470 series thermostat housing with RTD 32° to 122☏ (0° to 50☌), non-condensing. System Integration: Zero and Span Adjustment: Maximum Output Current: Power Connections: Sensor Connections:ġ00 ohm platinum RTD, 0.00392 ohm/ohm/☌ TCR, 100 ohm platinum RTD, 0.00391 ohm/ohm/☌ TCR, 100 ohm platinum RTD, 0.00385 ohm/ohm/☌ TCR, 1000 ohm platinum RTD, 0.00385 ohm/ohm/☌ TCR 1000 ohm platinum RTD, 0.00375 ohm/ohm/☌ TCR 4 to 20 mA DC over specified range, limited to 30mA maximum. Output: Calibration Accuracy: Transmitter Linearity: Physical: Operating Environment: Storage Environment: Ambient Temperature Effects: Warm-up Drift: Supply Voltage: Input Voltage Effect: Maximum Load Resistance: Note: Transmitter circuit board only, Room Air housing and RTD sold separately. The leads that supply power also carry the current signal. The current changes according to the range in which the Temptran is calibrated: 4 mA at the lowest temperature of the range, rising to 20 mA at the top of the range. The TemptranTM converts the RTD's signal into a 4 to 20 mA DC current.