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Multi-Calibrator for Process Instrumentation
Simulates and Reads Ohms, RTDs and thermocouples
Sources and Reads Millivolts, Volts and Milliamps
Powers and Reads 2-wire transmitters,
Simulates 2-wire transmitters
Keystroke function memory Simultaneous input and output reading Auto-stepping for hands free calibration TxSimulation at control system inputs
A True Field Calibrator
Designed to simulate and measure RTDs, Thermocouples and Resistors. It also sources and reads milliamps, millivolts and volts. To carry out fast calibrations, model CLD reads and powers temperature transmitters simultaneous with RTD or Thermocouple simulation. Tactile type membrane keys give you reliable feedback of all your keypad operations in any environment. The calibrator has a rugged industrial casing and raintight front panel component. A strong and handy carrying case protect the tester when stored in a toolbox and accommodates the test leads and instructions. Special straps allows the user to carry the tester in front with both hands free.
Easy to Operate
The model CLD has menu-driven operations for all functions. Simply press the up/down keys to scroll the menu ingredients and press "enter" to confirm your choice. Input and output data are displayed in a clear and logical manner. Operation and connection errors, like loop resistance mismatch and cold junction temperature sensor absence are monitored.
Keystroking
Keystroking eliminates time consuming keypad operations for functions you frequently use. One key stroke recalls every function you previously have stored, after you switch the calibrator on. Up to six functions can be stored and recalled.
Simulation and Outputs Signals
Source and simulation
signals can be ramped up and down manually in two speeds. Temperature units are displayed in °C or °F; memorized "switch-on" preference can be set by the user. Up to six output values for each type of signal can be temporarily stored and recalled manually or automatically (auto-stepping). Step timer setting is adjustable from 10 to 100 seconds.
Temporarily stored data saved in the keystroke memory remain available for later use. Unit can also output fixed steps in 10% divisions of free selectable spans in both manual and auto-stepping mode.
Unique Features to Calibrate Temperature Transmitters
2-wire temperature transmitters can be connected in a closed calibration loop. Transmitters will be powered and read while receiving a simulated sensor signal. After converting transmitter output milliamps, both Tx output and input signals are simultaneously displayed in temperature units (°C or °F) for fast and easy comparison and calibration. In addition calibrator can output RTDs and Thermocouple signals preset at 25% span divisions.
Milliamps Converted to Read Engineering Units
Transmitter output or simulation readings may be scaled into engineering units like psi, pascal, bar etc. The calibrator also reads and simulates dp-transmitters directly in square root converted flow units on 4-20mA and 0-20mA ranges.
Tx Simulation at Control System Inputs
Simulating non-linearized temperature transmitters (Tx) allows the user to check and calibrate 4-20mA system input hardware and software fast and easily. User can set or manipulate temperatures in °C or °F related to any available sensor and send the appropriate milliamps to the system input. Milliamps can be monitored simultaneously on calibrator display.
Output Ramp Function
Output or simulation signals are increased or decreased automatically proportional to time. Travel limits, travel time and dwelling time can be set in an easy manner. Alternate increase and decrease can be performed to simulate a process signal for dynamic testing of control loops. Ramp function is also useful to test valves and alarm levels.
Extended Use on Alkaline Batteries
The CLD calibrator can operate for more than 20 hours from one set of alkaline batteries. Battery condition is precisely monitored indicating replacement priorities at two levels. User can easily change replacement levels into recharge levels when rechargeable NiCd batteries are preferred. For bench use the calibrator may be powered by using an optional AC line adaptor.
The "Info Key"
To ensure a clear and simple presentation of the readings, several settings, like for thermocouples, are not continuously displayed. Pressing the info-key shows what menu selections were made previously.
Accurate Cold Junction Compensation
Every calibrator on the market heats up even when dissipation is limited to a few Watts. Therefore, instrument build-in sensors to compensate for cold junction emf's read too high a temperature (0.5°C or 1.0°F is not exceptional).
To avoid this undesirable effect, a Pt100 cold junction sensor has been accommodated in a separate terminal block. The terminal block also has rugged binding connectors to fix loose wire ends.
Service Friendly
A sound mechanical concept allows each circuit board replacement while comprehensive instructions for recalibration are part of the user guide. Last calibration date annunciation reminds the user to maintain quality assurance over longer periods of time. The CLD has been programmed to perform self diagnoses to annunciate any malfunction.
| To Order (Specify Model No.) | ||
| Model No. | Price | Description |
| CLD | $1990 | Multi-Calibrator for Process Instrumentation |
| CLBPS | 110 | Charger/power supply 115/230 V - 50Hz/60Hz |
| DTB | 195 | Terminal block for CLD |
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