The Combo HI 991404 and HI 991405 series meters from HANNA® are designed for continuous, high accuracy pH, EC/TDS and temperature measurements. These microprocessor indicators continuously monitor the three most important nutrient parameters in hydroponics, greenhouses and horticultural applications with a single instrument. These indicators feature a large, dual-level, backlit LCD to give you instantaneous readings of pH, EC or TDS and temperature, even from a distance.

At startup, these indicators perform a self-check to assure proper working condition. HI 991404 and HI 991405 stability indicator and hold features prompt the user when to take the reading and freezes the display for easy and accurate recording.

Calibration and temperature compensation is automatic, while the EC/TDS conversion factor and temperature coefficient (ß) are user adjustable for application-specific measurements.

These instruments are supplied with an advanced, non-clogging double junction pH electrode and a rugged conductivity probe that will withstand even the most aggressive environments. The instruments are powered by a 12 Vdc transformer and are easy to install and use, making them ideal for all continuously monitoring applications.

Order Information:
HI 991404 is supplied with HI 1293D pH electrode, fixed HI 7630 probe, pH and EC calibration solutions, 12 Vdc power adapter and instructions.



SPECIFICATION:

Range
pH 0.0 to 14.0 pH
Range
EC 0 to 3999 µS/cm
Range
TDS 0 to 2000 ppm (mg/L)
Range
Temperature 0.0 to 60.0°C (32 to 140°F)
Resolution
pH 0.1 pH
Resolution
EC 1 µS/cm
Resolution
TDS 1 ppm
Resolution
Temperature 0.1°C (0.1°F)
Accuracy
pH ±0.1 pH
Accuracy
EC/TDS ±2% F.S.
Accuracy
Temperature
±0.5°C (±1°F)
Temperature Compensation
pH: automatic
EC/TDS:
automatic with ß adjustable from 0.0 to 2.4%/°C
Calibration
pH: automatic, 1 or 2 points with 2 sets of memorized buffers;
EC/TDS:
automatic, 1 point
pH Electrode
HI 1293D (included)
EC/TDS Probe
HI 7630 (fixed)
EC/TDS Conversion Factor
adjustable from 0.45 to 1.00
Environment
0 to 50°C (32 to 122°F); RH max 95%
Input Impedance
1012 Ohm
Power Supply
12 Vdc power adapter (included)
Dimensions
160 x 105 x 31 mm (6.3 x 4.1 x 1.2")
Weight
190 g (6.7 oz.)