The HE-960RW is a high-grade 96 × 96 mm DIN panel-mount 2-channel resistivity meter from HORIBA's 48/96 Series, designed for control and monitoring of pure water and ultrapure water treatment and production processes. It incorporates a newly designed temperature measurement circuit that significantly improves temperature compensation performance — minimising errors caused by changes in both water temperature and ambient temperature. Two independent isolated sensor inputs allow simultaneous measurement at two process points with desalination rate display (0–100%). Four relay contact outputs, two isolated 4–20 mA outputs, RS-485 communication, UPW standard resistivity input, and clipping function complete the feature set.
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HE-960RW, Panel-Mount Type 2-Channel Electric Resistivity Meter, HORIBA
HE-960RW
Horiba
The HE-960RW is a high-grade panel-mount 2-channel resistivity meter from HORIBA's 48/96 Series, engineered for demanding pure water and ultrapure water monitoring applications. Its defining improvement over the single-channel HE-480R is a newly designed temperature measurement circuit that significantly enhances temperature compensation accuracy — delivering stable resistivity readings even when both water temperature and ambient temperature fluctuate simultaneously. Two independent, electrically isolated sensor inputs allow concurrent measurement at two process points, with automatic display of desalination rate (0–100%) based on the ratio between channels. Four relay contact outputs, two isolated 4–20 mA outputs (selectable 4–20 or 0–20 mA), and RS-485 communication support comprehensive process integration. UPW standard resistivity input and clipping function are included. Optional transmitter and sensor combination calibration service is available.
Key Features HE-960RW
- Newly designed temperature measurement circuit — significantly improved resistance to ambient temperature changes; stable resistivity measurement in varying environmental conditions.
- 2 independent isolated sensor input channels — simultaneous measurement at two process points; desalination rate display 0–100%.
- Enhanced repeatability ±0.1% FS (vs ±0.5% FS on single-channel models) — high-precision UPW and high-temperature pure water measurement.
- Two isolated 4–20 mA DC outputs (or 0–20 mA selectable; max. 900 Ω): freely assignable within measuring range.
- Four relay contact outputs: R1–R3 (SPST 1a, 240 V AC / 30 V DC, 3 A) — upper/lower alarm, ON/OFF control, delay, hysteresis; R4 (SPDT 1c, same rating) — selected measurement, anomaly alarm, or maintenance. R1/R2 and R3/R4 share common contacts respectively.
- RS-485 communication for SCADA/process system integration.
- UPW standard resistivity input: 18.23 MΩ·cm (standard), 18.18 MΩ·cm, 18.24 MΩ·cm / 182.3 kΩ·m (standard), 181.8 kΩ·m, 182.4 kΩ·m.
- Clipping function: display held at user-defined ceiling when measured value is exceeded.
- Temperature compensation: extra DI water + impurity characteristics (NaCl or arbitrary coefficient, ref. 5–95 °C), or none; Pt 1 kΩ; range 0–100 °C.
- Panel face IP65 (IEC60529 / JIS C0920); 96 × 96 mm DIN; ABS case; Class II device IEC61010-1, Pollution Level 2.
- CE marked: EN61326-2-3, EN61010-1, RoHS EN50581; FCC Part 15.
Applications
The HE-960RW is suited to continuous dual-point resistivity monitoring in ultrapure water production and distribution systems, reverse osmosis system desalination rate monitoring, semiconductor fab process water management, pharmaceutical WFI and purified water loops, and any high-purity water application requiring precise 2-channel measurement with enhanced ambient temperature stability.
Installation and Safety Notes
Install into a standard 96 × 96 mm panel cutout. Power: 100–240 V AC, 50/60 Hz, 10 VA max. Panel face IP65; rear case IP20; terminals IP00 — protect the rear from moisture. Operating temperature −5 to 45 °C; storage −25 to 65 °C; humidity 20–85% RH non-condensing.
Technical Specifications
| Parameter | Resistivity, Temperature, Desalination Rate |
| Measurement method | 2-electrode resistivity (ERD/ERF Series, cell const. 0.01 /cm) |
| Sensor inputs | 2 channels, electrically isolated from each other |
| Resistivity range | 0–2.00 / 0–20.00 MΩ·cm; 0–20.0 / 0–200.0 kΩ·m; up to 100.0 MΩ·cm (no temp. comp.) |
| Desalination rate | 0–100% |
| Temperature range | 0–100 °C (measurement range −20 to 120 °C; 1 or 2 decimal places selectable) |
| Repeatability (resistivity) | Within ±0.1% FS |
| Linearity (resistivity) | Within ±0.5% FS |
| UPW standard resistivity input | 18.23 / 18.18 / 18.24 MΩ·cm; 182.3 / 181.8 / 182.4 kΩ·m (selectable) |
| Clipping function | Display held at user-defined ceiling when exceeded |
| Temperature compensation | Extra DI water + NaCl impurity / arbitrary coeff. (ref. 5–95 °C) / none; Pt 1 kΩ; 0–100 °C |
| Transmission output | 2 × 4–20 mA DC (or 0–20 mA), isolated; max. 900 Ω; free range setting |
| Contact output | R1–R3: SPST (1a), 240 V AC / 30 V DC, 3 A; R4: SPDT (1c), 240 V AC / 30 V DC, 3 A; alarm, ON/OFF control, delay, hysteresis, anomaly, maintenance |
| Communication | RS-485 |
| Power supply | 100–240 V AC, 50/60 Hz, 10 VA max. |
| Operating temperature | −5 °C to 45 °C |
| Storage temperature | −25 °C to 65 °C |
| Humidity | 20–85% RH (non-condensing) |
| Protection rating | Panel face IP65; rear case IP20; terminals IP00 (IEC60529 / JIS C0920) |
| Installation type | Indoor panel-mount (48/96 Series, DIN 96×96 mm) |
| Housing material | ABS (panel case); PBT (terminals) |
| Dimensions (W × H × D) | 96 × 96 × 115 mm (case depth approx. 105 mm) |
| Weight | Approx. 550 g |
| Compliance | CE (EN61326-2-3, EN61010-1, RoHS EN50581); FCC Part 15; Class II device IEC61010-1; Pollution Level 2 |
| Manufacturer | HORIBA Advanced Techno Co., Ltd. |
| Brand | Horiba |
