Field-installation Type pH Meter (Four-Wire Transmission)
HP-200 connects pH sensor and measures pH and temperature in the sample water. Suitable for monitoring and control of various production processes and wastewater treatment, etc. Many types of electrodes are available to match the sample properties.
pH: 0 - 14
Temperature: 0 - 100℃
Product name | pH meter | |||
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Model | HP-200 | |||
Combined sensor | Glass electrode | |||
Measurable range | pH | pH0 to pH14 (display range: pH−1 to pH15) | ||
Temperature | 0℃ to 100℃
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Display resolution capability | pH | 0.01 pH | ||
Temperature | 0.1℃ | |||
Efficiency | pH | Repeatability | Within ±0.03 pH (response for equivalent input) | |
Linearity | Within ±0.03 pH (response for equivalent input) | |||
Temperature | Repeatability | ±0.3℃ (response for equivalent input) | ||
Linearity | ±0.3℃ (response for equivalent input) | |||
Transmission output | Number of outputs | 2 (the negative terminals for transmission outputs are internally connected and at the same electric potential) | ||
Output type | 4 mA to 20 mA DC: input/output isolated type | |||
Load resistance | Max: 900Ω | |||
Linearity | Within ±0.08 mA (output only) | |||
Repeatability | Within ±0.02 mA (output only) | |||
Output range | Output 1 | pH: Selection from preset ranges or free range input within measuring range. | ||
Output 2 | Temperature: Free setting within a range between −20℃ and 130℃ | |||
Occasional out for error | Hold or burnout to either 3.8 mA or 21 mA | |||
Transmission hold | In the maintenance mode, transmission signal is held at the latest value or preset value. In the calibration mode, transmission signal can be alive or held. | |||
Contact output | Number of output | 5 | ||
Output type | No-voltage contact output | |||
Contact type | Relay contact; SPDT (1c) | |||
Contact capacity | 250 V AC, 3 A; 30 V DC, 3 A (resistance load) | |||
Contact function | R1, R2 | Selectable from upper limit alarm, lower limit alarm, ON/OFF control, and time-sharing proportional control. | ||
R3, R4 | Selectable from upper limit alarm, lower limit alarm, ON/OFF control, currently holding of transmission output, and cleaning output. | |||
FAIL | Error alarm | |||
Alarm setting range |
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Control function | ON/OFF |
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Control function | Time-sharing proportional control |
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Cleaning output | Number of outputs | 1 | ||
Output type | AC power control output (applied power supply voltage) | |||
Contact type | Relay contact, SPST (1a) | |||
Contact capacity | 250 V AC 0.5 A | |||
Contact function | Solenoid valve for cleaning control | |||
Settings | Cleaning period | 0.1 hours to 168.0 hours | ||
Cleaning time | 2 seconds to 600 seconds | |||
Hold time | 2 seconds to 600 seconds | |||
Timer accuracy | Within 2 minutes per month | |||
Description of cleaning operation | One of the following operations. | |||
Contact input | Number of inputs | 1 | ||
Contact type | No-voltage "a" contact for open collector | |||
Conditions | ON resistance: 100 Ω max. Open voltage: 24 V DC Short-circuit voltage: 12 mA DC max. | |||
Contact function | External input for cleaning or transmission holding if cleaner is not attached. | |||
Communication capability | Communication method | RS-485 | ||
Signal type | 2 wire system, isolated from the input circuit Not isolated from transmission circuit | |||
Temperature compensation | Applicable temperature element | Platinum resistor: 1 kΩ (0℃) | ||
Normal characteristic temperature-sensitive resistor: 500 kΩ (25℃), 6.8 kΩ (25℃),10 kΩ (25℃) | ||||
Element selection method | Automatic temperature sensor type detection or manual selection (no temperature element is selectable) | |||
Temperature compensation range | 0℃ to 100℃ | |||
Temperature calibration | 1 point calibration comparing reference thermometer | |||
Calibration | Calibration method | Auto or basic (manual) calibration | ||
Number of calibration points | Selectable from 1, 2, and 3 points | |||
Kinds of standard solutions | pH 2, 4, 7, 9, and 10 | |||
Any pH standard solution (with difference of 2 pH or more) for basic calibration | ||||
Additional capabilities | Automatic detection of kind of standard solution | |||
Automatic detection of electric potential stability | ||||
Automatic detection of calibration failure (asymmetry potential, sensitivity, or response time) | ||||
Calibration history (asymmetry potential, sensitivity, and number of days elapsed after last calibration) | ||||
Self-check | Calibration error | Asymmetry potential error, sensitivity error, and response time error | ||
Temperature calibration error | ||||
Standard solution detection error | ||||
Electrode diagnostic error | Cracking of glass response membrane | |||
Reference electrode impedance error (only applicable for differential circuit mode with a liquid ground electrode) | ||||
Temperature sensor short-circuit, temperature sensor disconnection, and deviation from temperature measurement range | ||||
Meter error | CPU error, ADC error, and memory error | |||
Operating temperature range | −20℃ to 55℃ (without freeze) | |||
Operating humidity range | Relative humidity: 5% to 90% (without condensation) | |||
Storage temperature | −25℃ to 65℃ | |||
Power supply | Rated power supply voltage | 100 V to 240 V AC ±10% 50/60 Hz | ||
Power consumption | 15 VA (max) | |||
Others | With power switch for maintenance use | |||
Compatible standards | CE marking | EMC :EN61326-1 Class A, Industrial electromagnetic environment Safety :EN61010-1 RoHS  :EN50581 9. Industrial monitoring and control instruments | ||
FCC rules | Part15 Class A | |||
Structure | Installation | Outdoor installation type | ||
Installation method | Mount on 50 A pole or wall | |||
Protection code | IP65 | IEC60529, JIS C0920 | ||
Case material | Aluminum alloy (coated with epoxy-denatured melamine resin) | |||
Material of fittings | SUS304 | |||
Material of hood | SUS304 stainless steel (coated with epoxy-denatured melamine resin) | |||
Material of window | Polycarbonate | |||
Display element | Reflective monochrome LCD | |||
External dimensions | 180 (W) mm × 155 (H) mm × 115 (D) mm (excluding the fittings) | |||
Mass | Main body: Approx. 3.5 kg Cover and fittings: Approx. 1 kg |
An arrester (spark over voltage: 400 V) is implemented for transmission output, contact input, and communication. However, use a most suitable surge absorption element on the connection lines in accordance with the ambient environment, the situation of equipment installed, and the externally connected equipment.
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