HI 991404-01

Hanna Instruments HI 991404 Continuous Monitor pH / EC / TDS Meter & Thermometer Indicator

Rugged Watertight Casing
Temperature in °C and °F
EC (Electrical Conductivity) in micro siemens
TDS (Total Dissolved Solids) in ppm
Measurement Stability Indicator
Replaceable pH Electrode
Automatic pH Calibration at standard and NIST Buffer Sets
Automatic Temperature Compensation (ATC)
Adjustable Temperature Coefficient Factor
Only $191!

The new Combo HI 991404 is designed for continuous, high accuracy pH, EC/TDS and temperature measurements. This microprocessor indicator continuously monitors the three most important nutrient parameters in hydroponics, greenhouses and horticultural applications with a single instrument and features a large, dual-level, back-lit LCD to give you instantaneous readings of pH, EC or TDS and temperature even from a distance.

At startup, a self-check assures proper working condition. The HI 991404 has a stability indicator and hold feature to 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 (β) are user adjustable for application-specific measurements. This instrument is supplied with an advanced, non-clogging double junction pH electrode and a rugged conductivity probe that will withstand even the most aggressive environments. The power source is a 12 volt DC transformer. Easy installation and use make it ideal for all continuous monitoring applications.

The HI 991404 is supplied complete with HI 1293D pH electrode, HI 7630 EC/TDS/temp probe (fixed), 12 VDC adapter, packets of pH4 & pH7 buffers (20 mL each) & 1413 µS/cm EC solution and instructions.

NOTE: The HI 991404 should not be used in the vicinity of digital electronic lighting ballasts, use the HI 981504/5 instead

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HI 99140401-01

Click for information about calibration solutions
Click to download a PDF of the instruction sheet for this meter

Specifications:
Range	pH	0.00 to 14.00 pH (full scale)
	EC	0 to 3,999 µS/cm
	TDS	0 to 2,000 ppm/cm
	Temperature	0.0 to 60.0 °C or 32.0 to 140.0 °F
Resolution	pH	0.1
	EC	1 µS/cm
	TDS	1 ppm
	Temperature	0.1 °C or 0.1 °F
Accuracy (@ 20°C/68°F)	pH	±0.1
	EC/TDS	±2% Full Scale
	Temperature	±0.5 °C or ±1 °F
Typical EMS Deviation	pH	±0.1
	EC/TDS	±2.5% Full Scale
	Temperature	±1 °C or ±2°F
Calibration	pH	1 or 2 points with 2 sets of memorized buffers
	EC/TDS	Automatic at 1 point
Temperature Compensation	ph	Automatic
	EC/TDS	BETA adjustable from 0.0 to 2.4 per °C in increments of 0.1
EC / TDS Conversion Factor		Adjustable from 0.45 to 1.00
Environment		0 to 50°C (32 to 122°F)
Power Supply		12VDC power adapter (included)
Dimensions		160 x 150 x 31 mm (6.2 x 4.1 x 1.2")
Weight		190 g (6.7 oz.)