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| Tachtrol 3 - Input Signals - Click Here to access detailed info on all products. |
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| Tachtrol 3 - Input Signals - Click Here to access detailed info on all products. |
Frequency: 2 Hz to 30K Hz
Passive Sensor: (sine wave): 200 mV to 25 Vrms standard 2K ohm impedance, common mode rejection: 40 db, balanced input sensitivity measured at 1K Hz.
Active Sensor: (TTL): duty cycle 20 to 80%, DC sensor power is 12 Vdc @ 100 mA [will power two (2) zero velocity sensors or one (1) bi-directional sensor].
Bi-Directional Sensor: One (1) frequency input (TTL input A) and the direction input (TTL Input B) from a bi-directional sensor. [High (+5v) indicates positive direction, and only single speed functions (Speed A) are useful when connected in this operation mode.]
| Tachtrol 3 - Power Supply - Click Here to access detailed info on all products. |  |
120 Vac ±10%, 50-60 Hz
24 Vdc (23-30 V) std. 750 ohm analog load or (20-30 V) with
600 ohm analog load. 15 watts maximum power.
| Tachtrol 3 - Environmental - Click Here to access detailed info on all products. | |
Temperature:
0 to 50°C operating
-40° to 80°C storageHumidity:
90% relative and non-condensingVibration:
Designed to meet MIL 810C, method 514.2. Procedure VIII.
Fig. 514.2-6. Curve V
(1.5 g's. 10-200 Hz).Shock:
Designed to meet MIL 810C. method 516.2. Procedure I
Fig. 516.2-2 for ground equipment (30 g's. half sine).Displays:
4 1/2 digit with minus sign & decimals (positive direction indicated by no minus sign).
Bright .56" Red LED
Fixed or floating decimal (3 places)
Number range ±0.000 to ±19999
Three (3) LED function indicator lamps.
| Tachtrol 3 - Outputs - Click Here to access detailed info on all products. | |
Analog: 0-20 mA or 4-20 mA, field selectable, output consists of one thousand 20 µA steps. 750 ohm load maximum. Span pot-adjustable ±10%. Zero and full scale set into memory in engineering units.
0-10 Vdc or 0-5 Vdc output obtained by selecting the 0-20mA mode and using a resistor across the input of the receiving instrument whose parallel combination with the input resistance of the receiver is 500 ohms or 250 ohms respectively.Serial Digital: RS232C compatible transmit only ASCII. 300 baud. asynchronous with odd parity. 2 stop bits and carriage return. Transmission format selectable to transmit continuously or on any setpoint alarm. Transmission preceded by linefeed (Lf) and followed by carriage return (Cr). Each value consists of a space (Ø), a two (2) digit identifier, a colon and a right justified (7) character field of data (4 1/2 digit number, sign and decimal) Plus (+) sign, and leading zeros indicated by spaces (bbb). The following are examples of the four (4) type transmissions:
LfbDO: (display value) Cr
LfbAO: (analog output value) Cr
LfbS1: (SP 1 value) bS2 (SP 2 value) Cr
(SP value = difference between setpoint and actual)
LfbDO: -19.999bAC: b199.99bSP1: bbb-999bSP2:bbb0.00CrRelay Setpoints: 2 relays standard,SPDT, 6A@ 28 Vdc or 240 Vac, 170W or 1800 VA. Selective relay logic: Energize or de-energize above or below setpoint, auto-reset with hysteresis selectable 0-99% in 1% steps, latching (reset by pushbutton located behind front panel door).
Most AI-TEK (formerly Airpax) sensors are in stock and can be shipped within one day. Toll free application assistance is always available.
| Tachtrol 3 - Response Times & Electrical Specs. | |
Display: updated approx. every 1/2 sec. based on latest available input measurement(s).
Serial Output: Transmits each output value in approx. 1/2 second based on input measurements obtained at the time each value is transmitted.
Analog & Relay Outputs: updated at a variable rate depending on the frequency. The typical & maximum response times are
Above 100 Hz =
100 ms typical
200 ms max.
2 to 100 Hz =
2 cycles + 30 ms typ.
6 cycles + 30 ms max.
Below 2 Hz = Measurement considered 0.
For values computed from both signal inputs, a new computed value is updated each time either signal completes a measurement.Range of Normalization: (linear or inverse only)
Input frequencies A & B may be normalized by a number from .5000 x 10-7 to 2.000 x 107
Normalization is entered in the form:
+-1XXXX
+-1XXXX
Additional display normalization range ±.001 to 19999.Constant Storage:
Retained in EAROM and may be altered 1000 or more times.Electrical References:
Circuit Common is isolated from AC power, AC ground and case.
DC power, analog output and serial output are referenced to circuit common. Passive inputs are balanced. Active sensor inputs are referenced to circuit common.Accuracy: (including temp. variations)
| Digital | ±.03% typical (±.05% max.) & |
| ± 1 least significant digit | |
| Analog | ±.3% of range |
| Tachtrol 3 - Mounting Dimensions | |
| Tachtrol 3 - OPERATION - Click Here to access detailed info on all products. | |
The Tachtrol 3 unit may be configured for measurement of a single speed signal, two unrelated speeds or a speed with direction indication (from an Airpax bi-directional sensor). In addition, a mathematical function may be computed from two related input signals. These computed functions are:
Speed A (A + B)/2 (Average) Speed B A-B (Difference) A/B (Ratio) B/A (Inverse Ratio) ±A (Speed with direction)
- (A-B)/A x 100 (% Slip)
- (B-A)/A x 100 (% Elongation)
The Tachtrol 3 unit permits independent assignment of any of these functions to any output (display, analog output and 2 setpoints). Additionally, the serial digital ouput may report on any or all outputs continuously or on setpoint alarm. All forms of relay logic are field selectable.
The Tachtrol 3 unit is supplied with an electrically alterable read only memory (EAROM) which contains all of the constants necessary to define the conversion factors and instrument functions. These constants can be individually displayed and altered by a method similar to the setting of a digital clock.
By utilizing a microcomputer as the heart of the instrument, response time is improved tenfold over the traditional EPUT (events per unit time) tachometry. Further, this fast response time is attained with no sacrifice in digital accuracy.
Outputs: The TACHTROL 3 can transmit any of the 6 computed functions, speed A, or speed B, or speed A with direction to any of the 4 outputs. You may specify one function for each output. Here are the possibilities:
Outputs Selective Function Function Display - - - - - - - - - Speed A Analog - - - - - - - - - Speed B Relay 1 - - - - - - - - - A - B Relay 2 - - - - - - - - - ±A (dir.) A/B B/A (A + B)/2 (A - B)/A x 100 (B - A)/A x 100
If one of the outputs is not used, a tenth function, coded O, may be specified, turning the specific output off.
Analog Output: The zero and full scale for the analog output can be programmed to normal or expanded scale, such as:
4-20 mA = 0 to 900 FPM
or
4-20 mA = 450 - 900 FPMSerial Digital Output: The serial digital (RS232C) output may transmit the value on the display, the analog output value, the two setpoint deviations or all four of these values. They may be continuously transmitted or transmitted on setpoint alarm. An example of the outputs specified is:
Display: A/B
Analog output: Speed A
RS232C: Transmit all values.
Setpoint 1: A/BRelays: Each relay may operate on Input A, Input B or the computed function. They may energize, de-energize, latch or auto-reset at the setpoint. Hysteresis (difference between setpoint value and setpoint reset) is normally 5% but may be specified for any value from 1% to 99% of setpoint.
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| Important Note on Part Numbers:
The entire Airpax part numbering scheme was changed several years ago. If you are looking for a replacement and can't find the part number, please contact. We have a complete cross reference to the older part numbers. |
The complete Airpax catalog (45 pages) is available as an Adobe Acrobat (.pdf) file. It has complete specifications & dimensional drawings. Click here to view or download the file. To view the data sheets, you need Adobe® Acrobat® Reader
- © FLW, Inc 1997- - S.D.G.
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Most AI-TEK (formerly Airpax) sensors are in stock and can be shipped within one day. Toll free application assistance is always available.
