Q438 |
 |
 |
 |
 |
 |
| TECHNICAL SPECIFICATION (Q438) |
|||
| Potentiometer Input | |||
| Resistance (End to End): | 100W up to 100KW | ||
| Input Impedance: | >1MW | ||
| Input Excitation: | 500mV, 5mA maximum drive. | ||
| Zero Turn-Up: | 80% of full scale inpu | ||
| Span Turn-Down: | 80% of full scale input (Table 1) | ||
| Output | Voltage Output | ||
| Output: | 0-5V, 0-10V | ||
| Source Impedance: | <10W | ||
| Drive: | 10mA, max. (1KW min. @ 10V) | ||
| Current Output | Output: | 0-1mA, 0-20mA, 4-20mA | |
| Source Impedance: | >100KW | ||
| Compliance: | 0-1mA; 7.5V, max. (7.5KW, max.) | ||
| 0-20mA; 12V, max. (600W, max.) | |||
| 4-20mA; 12V, max. (600W, max.) | |||
| Accuracy (Including Linearity, Hysteresis) | |||
| ±0.1% maximum at 25°C. | |||
| Stability | Temperature: | <±0.05%/°C maximum of full scale range. | |
| Response Time (10 to 90%) | <200mSec., typical. | ||
| CMRR | 120dB @ DC, >100dB @ 60Hz | ||
| Isolation | 1800VDC between line power and input, output | ||
| EMC Compliance (CE Mark) | |||
| Emissions: | EN50081-1 | ||
| Immunity: | EN50082-2 | ||
| Safety: | EN50178 | ||
| LED Indication (green) | Active DC power | ||
| Humidity (Non-Condensing) | |||
| Operating: | 15 to 95% (@ 45°C) | ||
| Soak: | 90% for 24 hours (@ 65°C) | ||
| Temperature Range | |||
| Operating: | 0 to 55°C (32 to 131°F) | ||
| Storage: | -25 to 70°C (-13 to 158°F) | ||
| Power | Consumption: | 1.5W typical, 2.5W max | |
| Range: | 9 to 30VDC | ||
| Weight | 0.48 lbs | ||
| Agency Approvals | UL recognized per standard UL508 (File No. E99775). | ||
| CSA certified per standard C22.2 No. 0-M91 and 142- M1987 (File No. LR42272-84). CE Compliance per EMC directive 89/3/36 EEC and Low Voltage 73/23/EEC. | |||
|
Configuration For example, in a valve positioning application a potentiometer is sometimes used as a feedback signal. Quite often a wide open valve is only a 25% turn of the feedback potentiometer. In this case the Q438 can easily be adjusted with the zero and span to provide a full scale output signal (e.g. 4-20mA) representing 0-25% or even 50- 75% of the potentiometer input. Unless otherwise specified, the factory presets the Model Q438 as follows:
The DC power input accepts any DC source between 9 and 30V; typically a 12V or 24VDC source is used (see Accessories). For other output ranges, refer to Tables 1 and 2 to reconfigure switches SW1 and SW2 for the desired input and output ranges. |
Calibration
|
