Descripción
Comet U7844
- A solution for every need, every budget – economy and premium dataloggers
- High quality, accurate and stable sensors
- Built-in battery operated
- Built-in printer
Four Channel Data Logger with Pulse and Two-State Inputs
Data logger is designed to record from four binary inputs or from two pulses and two binary inputs. The recording is performed in non-volatile electronic memory. The data can be transferred to a PC via USB-C. Datalogger inputs can be set up for four binary inputs or two binary inputs and two pulse counters.
In case of exceeded set limits alarms are indicated by LED, LCD, and acoustically by built-in beeper. The device includes a Traceable calibration certificate with declared metrological traceability of etalons is based on requirements of EN ISO/IEC 17025 standard.
Two-channel binary-input counter
This model includes four inputs. Two of them can function as counters, and all four inputs can function as binary inputs. Both counter and binary inputs serve to monitor voltage signals or signals coming from a voltage-free contact. The binary input changes are registered immediately, irrespectively of the recording interval setting. To safe record the input status, the signal must be present for at least 1 s. Binary inputs can capture connected/disconnected voltage status. The counter states are recorded according to the set Record interval. Input signals are connected to a connecting block.
Connection Mode: For the procedure for connecting wires to the connecting block refer to Annex 4.
The device’s ingress protection is IP 20. Due to its low ingress protection, the device is not suitable for use in dusty rooms or rooms exposed to water ingress. The maximum length of the input wires should not exceed 30 m. It is recommended to use shielded cables. The battery in the device cannot be charged.
Optional input configurations:
- 2 x counter + 2 x binary input
- 1 x counter + 3 x binary input
- 4 x binary input
Manufacturer Specs
| BINARY INPUT | |
| Parameters of the voltage contact | «L» level input voltage:< 0,4 V(*); «H» level input voltage:> 2 V; Minimum voltage applicable:0 V; Maximum voltage applicable:+30 V DC |
| Parameters of the voltage-free contact | Contact resistance in «switched-on» state:< 10 kOhm; Contact resistance in the «switched-off» state:> 300 kOhm; Contact voltage in the «switched-off» state:ca 3 V; Minimum state duration necessary for latching the state:1s |
| COUNTER INPUT | |
| Counter parameters | Range 24 bits (16 777 215), possibility of letting the counter overflow |
| Maximum pulse frequency | configured for voltage input – max. 5kHz configured for a voltage-free or open-collector transistor – max. 200Hz |
| GENERAL TECHNICAL DATA | |
| Operating temperature | -20 to +60 °C |
| Channels | 4x binary input nebo 2x binary input a 2x counter |
| Memory | 500,000 values in noncyclic logging mode; 350,000 values in cyclic record mode |
| Recording interval | adjustable from 1 s to 24 h |
| Display and alarm refresh | adjustable 1 s, 10 s, 1 min |
| Recording mode | noncyclic – data logging stops after filling the memory cyclic – after filling memory oldest data is overwritten by new |
| Real time clock | year, leap year, month, day, hour, minute, second |
| Power | Lithium battery 3.6V, size AA |
| Protection class | IP20 |
| Dimensions | 61 x 93 x 32 mm |
| Weight (including batteries) | approx. 120 g |
| Warranty | 3 years |
Tech Specs
Dataloggers / Data Acquisition/Dataloggers for Environmental Variables/Temperature Dataloggers Templ |
|
|---|---|
| Max Temperature | 60 C |
| Min Temperature | -20 C (-4 F) |
| Power Source | Battery |
| # Inputs/Channels | 4 |
| SAMPLE RATE/Intervals | adjustable from 1s to 24h |
| LCD Screen | Yes |
| Software Included | Yes |
Test Equipment General Attributes |
|
| Warranty | 3 YEARS |
| Interfaces I/O | USB-C |
| IP Rating | IP20 |
| Product Weight | 0.26 LBS |
| Product Height | 2.4 IN |
| Product Length | 3.7 IN |
| Product Width | 1.3 IN |
| Shipping Weight | 0.3 LBS |
| Data Logging | Yes |
| Battery Type | Li-ion |
| Power Supply Voltage | Battery Powered |
| Country of Origin | Czech Republic |
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