NEP390 Handheld Turbidity Meter
- Choice of Turbidity Ranges 40NTU, 100NTU, 400NTU and 1,000NTU
- Ideal for most applications
Overview
The ANALITE 390 series of microprocessor based handheld turbidity meters are designed for applications where turbidity levels of up to 1,000NTU may be encountered. Ranges can be set by the user at 40NTU, 100NTU, 400NTU and 1,000NTU. There are four probes available which complete the ANALITE 390 series: NEP390, NEP391, NEP395 and NEP396 which can all be operated at depths of up to 100 metres (approx 330 feet).
Where applications are required in fast cold running water or for short monitoring deployment the NEP390 and NEP391 turbidity meters are ideal. Where bio-fouling and sedimentation build up is likely to be encountered the NEP395 and NEP396 turbidity meters have been specifically designed with an integral wiper assembly which can be initiated automatically (periodically) via a direct RS232 command or manually as required.
All turbidity probes almost totally reject fluctuating ambient light conditions due to a unique modulation technique. Plus use 90?optics and employ infrared light in accordance with ISO7027.
Calibration can be carried out at any time or have later firmware uploaded by the user via the RS232 interface.
Two cable connection systems are available. The standard version employs a marine grade connector to terminate the cable to the turbidity probe, whereas the G version has the cable permanently connected to the probe via a waterproof gland.
Manufactured by: McVan
Model: NEP390 Handheld Turbidity Meter
Services offered for this product
- Sales
- Rental
- Installation
- Calibration
- Maintenance
- IoT Cloud Compatible
Applications
Monitoring of streams and rivers
Monitoring of water storage bodies including stratification studies
Intermediate and final effluent treatment monitoring
Hydrological run off studies
Ground and bore water analysis
Drinking water filtration efficiency
Industrial process monitoring
Sludge and dredge monitoring
Specification
| Technique | 90° modulated infra-red (ISO7027). | ||
| Ranges | 40, 100, 400 and 1,000NTU - range selection set by user, initially set at 100NTU. Other range values available at additional cost up to 3,000NTU. |
||
| Resolution | Range: 40NTU 100NTU 400NTU 1000NTU |
RS232/SDI-12: ±0.01NTU ±0.02NTU ±0.1NTU ±0.2NTU |
Analogue: ±0.06NTU ±0.15NTU ±0.60NTU ±1.50NTU |
| Repeatability | ±1% at 25°C. | ||
| Linearity | Better than 1% for 40NTU, 100NTU and 400NTU, 3% for 1,000NTU. | ||
| Temperature Coefficient | Better than ±0.05%/°C. | ||
| Repeatability | ±1% at 25°C | ||
| Linearity | Better than 1% for 40NTU, 100NTU and 400NTU, 3% for 1,000NTU |
||
| Temperature Coefficient | Better than ±0.05%/°C | ||
| Outputs | All models - RS232 - 1200BPS, 7 data bits, even parity, one stop bit. NEP390/395 - SDI-12 Protocol (V1.3). NEP391/396 - Analogue Voltage (0-1V or 0- 2.5v), minimum load 3kohms and Analogue Current (4-20mA or 0-20mA), maximum load 350 ohms. |
||
| Measurements | RS232 and SDI-12 interfaces Latest turbidity measurement -1 sample. Mean and Sample Variance (over 100 samples). Median (over 100 samples). Minimum (over 100 samples). Maximum (over 100 samples). Probe supply voltage. Probe internal temperature. Analogue Interface Analogue representation of the level of turbidity as a proportion of the range selected. Approximate update rate is 0.5 seconds. Voltage and current outputs operate concurrently. |
||
| Calibration | 2 or 3 point calibration for each range. May be set by the user only through the RS232 interface and for the range selected. Can revert back to factory calibration settings after user calibration. |
||
| Power | 9.6 - 16V dc, 35mA ON. 60mA ON and wiping for NEP395 and NEP396 only. STANDBY of 1.5mA on NEP390 and NEP395 only. Add a provision for an additional 20mA for the NEP391/396 if the 0/4-20mA output is used. |
||
| Wiping | Initiated by wipe or autowipe $ commands under the RS232 interface or M8! command under SDI-12 or for the NEP396 only it can be externally initiated by momentarily (>50msecs) bringing the RS232RX conductor to the 0V conductor. |
||
| Wipe Time | 6 seconds nominal. | ||
| Weight | NEP390/391 - 500gms - probe only, 100gms connector plus 70gms per meter of cable. NEP395/396 - 550gms - probe only, 100gms connector plus 70 gms per meter of cable. |
||
| Dimensions | NEP390/391- 250mm long unmated, 321mm long mated to end of protective boot, 32m dia. NEP390G/391G- 292mm long including glanding and strain relief assembly, 32mm diameter. NEP395/396- 256mm long unmated, 327mm long mated to end of protective boot, 32m dia. NEP395G/396G- 299mm long including glanding and strain relief assembly, 32mm diameter |
||
| Construction | Stainless steel casing with protruding castellations to protect the plastic fibre-optic face. Cable connection via 7-way waterproof connector (standard version), or probe cable is glanded directly from the rear of the probe via an integrated plastic strain relief (add suffix G to standard version). |
||
| Cable | NEP390/395 - 5 core + shield, 6mm dia. PUR sheath . Conductor resistance 45 ohms per km. NEP391/396 - 7 core + shield, 6.5mm dia. PUR sheath. Conductor resistance 75 ohms per km. |
||
| Cable Length | To order - 60m (200ft) maximum for NEP390/ 395, 99m (330ft) maximum for NEP391/396. |
||
| Depth Rating | 100m (330ft) | ||
| Operating Temperature | -10°C to 40°C | ||
| Storage Temperature | -20°C to 50°C | ||
