Data Loggers, Portable Remote Site Loggers, Low Power Multi-Channel

The MLIM-7 ModuLogger family Interface Module provides full isolation (channel to channel and channel to system) as well as the signal conditioning for interfacing thermocouple, DC Voltage and DC currents directly to the ModuLogger System Base. The module provides four fully isolated input channels that can be individually programmed for six thermocouple types, a multitude of DC voltages and DC currents. Additionally, 4 "piggyback" channels are provided on the module. Each of these channels shares a common with one of the isolated channels... resulting in a total of eight inputs that are isolated in pairs. The module utilizes differential inputs feeding into a low-noise, precision instrumentation amplifier followed with an on-module 18+ bit A to D converter... resulting in extremely accurate, high resolution readings. On board time and temperature stable references are used for self-calibration sequences as specified by the User in the ModuLogger data logging program.

Integral precision front end dividers allow for bipolar inputs ranging from mV to 30Vdc full scale... all without the User hassle of adding external divider circuitry. Additionally, for current measurements, a precision 100 ohm resistor is included... allowing for direct measurement of currents up to 25mA. 4-20mA inputs are simply configured... and all current inputs are fuse over-current protected.

The MLIM-7 is simply added to the ModuLogger instrument stack and can be added in the field by the User. The module installation and hardware configuration is automatically detected via the ModuLogger and communicated to the HyperWare software during the programming process. Range selection, input types, etc are then software selected.

The MLIM-7's fully isolated inputs solve measurement problems commonly found in industrial environments where sensors and/or signals have different ground potentials or circulating AC currents. All modules are calibrated, 100% performance and accuracy tested before shipping.. assuring Users of a consistent high quality product.

Why Use Isolated Inputs?

Thermocouple Based Temperature Measurement - Non-isolated as well as isolated thermocouple temperature sensors can be directly connected to the ModuLogger via the MLIM-7 module. All amplification, filtering, cold junction compensation and conversion to temperature units is then handled behind the scenes with minimal User setup requirements. Full channel to channel as well as channel to logger isolation exists.
Sampling Amplified Sensor Outputs - many sensor manufacturers can provide their sensors with amplified outputs... for example outputting a signal of 0 to 10Vdc which corresponds to a sensed pressure of 0 to 500 PSI. This signal can be directly interfaced to the ModuLogger system via the MLIM-7 in the Medium or Hi Voltage Input Range. Scaling of the sensed signal (eg Vdc) to Engineering units (eg PSIG) is simply handled through the data logger program developed within the HyperWare software and downloaded to the data logger's memory for execution.
Sampling Un-Amplified Sensor Outputs - with the programmable gain, extreme resolution (18+ bits) and accuracy of the ModuLogger system equipped with the MLIM-7 module, even un-amplified signals (eg load cell outputs) can be input to the ModuLogger for sampling, processing and eventual storage to memory. Due to the channel to channel isolation feature of the MLIM-7, bridge circuits can be excited with higher voltages without exceeding the common mode input range of the analog input channel... and without compromising the measurement accuracy of the unit.
Process Transmitter logging - the ubiquitous 4-20mA process signal which can represent PSI, RPM, Level, temperature, pH, etc can be directly handled by the MLIM-7 module. Engineering units conversion is readily handled by the program in the data logger. Full channel to channel isolation precludes measurement errors associated with circulating currents due to poorly isolated or different potential loop power supplies.

ANALOG INPUT CHANNELS:
Four (4) pairs of fully isolated analog input channels are provided on the MLIM-7. Each pair consists of a Primary channel and a Secondary channel. The Primary and Secondary channels share a common... hence they are not isolated from each other. However, each of the four pairs of channels is fully isolated channel to channel and channel to system. The Primary channels offer the full selection of input ranges while the Secondary channels do not offer the high Vdc input range.
Any combination of the following types/ranges can be configured with the MLIM-7 channels: