FIG. 01 / 05Gauge pressure transmitter and differential pressure transmitter with LCD housingsProduct photograph

FIG. 01 / 05Gauge pressure transmitter and differential pressure transmitter with LCD housingsProduct photograph

03 · Pressure MetersMonocrystalline silicon

Pressure & Differential Pressure Transmitters

Indiana catalogue ID: II-PT-001
Manufacturer model: ZT-2188-H · ZT-2188-G · ZT-3051DRG · ZT-3051DG · ZT-3051DP-SF

Gauge, vacuum, high-temperature and differential pressure transmitters with LCD and 4–20 mA + HART.

Accuracy: To 0.075% F.S.
DP range: To 25,000 mmWC
Output: 4–20 mA + HART

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Overview

A calibrated-range family covering gauge pressure to 200 kg/cm², vacuum to −1 kg/cm², high-temperature service with Hastelloy C-276 diaphragms, and monocrystalline silicon differential pressure from −100 mmWC to 25,000 mmWC. All models are two-wire 4–20 mA with HART and an integral LCD.

Operating principle

01The monocrystalline silicon transmitter is a digital instrument built on silicon sensor technology with single-chip microcomputer and sensor digital conversion.
02The demodulator output is converted by an 18-bit A/D circuit and passed to the microprocessor, which handles precision correction, engineering-unit conversion, sensor linearisation, range ratio and damping.
03EEPROM stores all configuration, characterisation and digital tuning parameters and is non-volatile, so settings survive a power loss.
04D/A conversion returns the corrected digital signal to the 4–20 mA loop. HART uses BELL202 frequency shift keying, superimposing a 1200 Hz or 2000 Hz digital signal on the 4–20 mA signal without disturbing it.
05An integrated ASIC performs signal conversion, acquisition and current output control, which gives the transmitter its stability, vibration resistance and interchangeability.

In context

Specified forreal process duty.

01Gauge and vacuum pressure monitoring on plant headers
02Steam and air pressure measurement
03Differential pressure across filters, draught systems and orifice plates
04Flow measurement using differential pressure

PRESSURE GAUGE ON A STAINLESS TRI-CLAMP PROCESS CONNECTION · ILLUSTRATIVE ENVIRONMENT

Variants and model selection

10 documented configurations. Open one to see its specification.

IIT-2188-HIIT-2188 pressure transmitter — 0 to 200 kg/cm²Gauge pressure on high-pressure service

IIT-2188-H — IIT-2188 pressure transmitter — 0 to 200 kg/cm²
Display	LCD
Output	4–20 mA + HART, two-wire
Power supply	24 V DC
Accuracy	0.2% F.S.
Measurement range	0–200 kg/cm²
Maximum working pressure	500 kg/cm²
Process connection	1/2″ NPT female
Calibration	0–200 kg/cm² corresponds to 4–20 mA output

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IIT-2188-HIIT-2188 pressure transmitter — vacuum, −1 to 0 kg/cm²Vacuum service

IIT-2188-H — IIT-2188 pressure transmitter — vacuum, −1 to 0 kg/cm²
Display	LCD
Output	4–20 mA + HART, two-wire
Power supply	24 V DC
Accuracy	0.2% F.S.
Measurement range	−1 to 0 kg/cm²
Process connection	1/2″ NPT female
Electrical interfaces	2 electrical connection ports

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IIT-2188-GIIT-2188 high-temperature transmitter — 0 to 5 kg/cm²High-temperature service, low range

IIT-2188-G — IIT-2188 high-temperature transmitter — 0 to 5 kg/cm²
Display	LCD
Output	4–20 mA + HART, two-wire
Power supply	24 V DC
Accuracy	0.2% F.S.
Threaded connection	1/2″ NPT female
Diaphragm material	Hastelloy C-276
Operating temperature	−40 to 85 °C
Measurement range	0 to 5 kg/cm²
Maximum working pressure	25 kg/cm²

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IIT-2188-GIIT-2188 high-temperature transmitter — −1 to 3 kg/cm²Compound range, high-temperature service

IIT-2188-G — IIT-2188 high-temperature transmitter — −1 to 3 kg/cm²
Display	LCD
Output	4–20 mA + HART, two-wire
Power supply	24 V DC
Accuracy	0.2% F.S.
Threaded connection	1/2″ NPT female
Diaphragm material	Hastelloy C-276
Operating temperature	−40 to 85 °C
Measurement range	−1 to 3 kg/cm²
Maximum working pressure	6 kg/cm²

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IIT-2188-GIIT-2188 high-temperature transmitter — 0 to 10 kg/cm²High-temperature service, mid range

IIT-2188-G — IIT-2188 high-temperature transmitter — 0 to 10 kg/cm²
Display	LCD
Output	4–20 mA + HART, two-wire
Power supply	24 V DC
Accuracy	0.2% F.S.
Threaded connection	1/2″ NPT female
Diaphragm material	Hastelloy C-276
Operating temperature	−40 to 85 °C
Measurement range	0 to 10 kg/cm²
Maximum working pressure	16 MPa

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IIT-3051DRGMonocrystalline silicon DP transmitter — −100 to 900 mmWCLow differential pressure, draught and flow

IIT-3051DRG — Monocrystalline silicon DP transmitter — −100 to 900 mmWC
Display	LCD
Output	4–20 mA + HART, two-wire
Power supply	24 V DC
Accuracy	0.075% F.S.
Differential pressure range	−100 to 900 mmWC
Static pressure rating	16 MPa
Wetted parts material	SS316
Diaphragm material	Hastelloy C-276
Clamp material	304 stainless steel
Electrical connection	1/2″ NPT female
Mounting bracket	2-inch pipe mount bracket

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IIT-3051DRGMonocrystalline silicon DP transmitter — 0 to 2,500 mmWCDifferential pressure and level

IIT-3051DRG — Monocrystalline silicon DP transmitter — 0 to 2,500 mmWC
Display	LCD
Output	4–20 mA + HART, two-wire
Power supply	24 V DC
Accuracy	0.075% F.S.
Differential pressure range	0 to 2,500 mmWC
Static pressure rating	16 MPa
Wetted parts material	SS316
Diaphragm material	Hastelloy C-276
Clamp material	304 stainless steel
Electrical connection	1/2″ NPT female
Mounting bracket	2-inch pipe mount bracket

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IIT-3051DRGMonocrystalline silicon DP transmitter — 0 to 25,000 mmWCHigh differential pressure

IIT-3051DRG — Monocrystalline silicon DP transmitter — 0 to 25,000 mmWC
Display	LCD
Output	4–20 mA + HART, two-wire
Power supply	24 V DC
Accuracy	0.075% F.S.
Differential pressure range	0 to 25,000 mmWC
Static pressure rating	25 MPa maximum
Wetted parts material	SS316
Diaphragm material	Hastelloy C-276
Clamp material	304 stainless steel
Electrical connection	1/2″ NPT female
Mounting bracket	2-inch pipe mount bracket

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IIT-3051DGMonocrystalline silicon DP transmitter — −40 to +40 kPa, air serviceAir differential pressure with IP66 housing

IIT-3051DG — Monocrystalline silicon DP transmitter — −40 to +40 kPa, air service
Display	LCD
Output signal	4–20 mA + HART
Power supply	24 V DC
Accuracy	0.1% F.S.
Measurement range	−40 to +40 kPa
Allowable static pressure	At least 3 bar
Wetted parts material	316L stainless steel
Bolts and nuts	316L stainless steel
Clamp material	304 stainless steel
Medium	Air
Medium temperature	20–90 °C
Mounting orientation	High-pressure side on the left
Electrical connection	Dual M20 × 1.5 female threads
Ingress protection	IP66

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IIT-3051DP-SFDual-flange DP transmitter with remote sealsLiquid level in closed or pressurised vessels — liquid ammonia service

IIT-3051DP-SF — Dual-flange DP transmitter with remote seals
Display	LCD
Output signal	4–20 mA + HART
Power supply	24 V DC
Accuracy	±0.25% F.S.
Flange size	2 inch
Flange rating	ASME Class 300#
Flange material	SS304
Diaphragm material	SS316L
Seal configuration	Remote diaphragm flange seals
Capillary length	2 m
Process fluid	NH₃ (liquid ammonia)
Process fluid density	0.65 kg/L (approximately 650 kg/m³)
Operating temperature	−11 °C
Operating pressure	1.85 kg/cm²
Design temperature	−5 °C
Design pressure	25 kg/cm²
Measuring / calibration height	813 mm
Tag number (as supplied)	12LC232

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Technical specifications

Transcribed from the product documentation. A value that is not shown is not stated in the source, and is confirmed with the quotation.

Common to the range

Common to the range
Output	4–20 mA with HART, two-wire, as specified for each model
Power supply	24 V DC, as specified for each model
Display	LCD showing pressure, current and 0–100% proportional display
Communication	HART protocol using BELL202 FSK, 1200 Hz or 2000 Hz superimposed on the 4–20 mA signal
A/D conversion	18-bit
Configuration memory	EEPROM, non-volatile

Installation

Installation
Mounting	2-inch pipe, wall or instrument panel
Electronic compartment	Rotates 90° left and right after loosening the locking screw — do not rotate beyond 90°
DP process connection holes	1/4-18 NPT, requiring thread sealing
DP connection hole centre distance	54 mm standard; 50.8 mm, 54 mm or 57.2 mm by rotating the waist flange joint
Recommended cable	Explosion-proof cable gland, cable diameter 8–12 mm
Signal cable	Shielding not required but stranded wire is preferred; keep away from power cables and strong electrical equipment
Insulation testing	Do not use a high-voltage megohm meter — test voltage must not exceed 100 V
Output current limit	Intrinsically safe design, output limited to less than 24 mA DC

Keypad configuration

Keypad configuration
Keys	M — menu · S — set · Z — select / OK
Menu 2	Change the primary variable unit
Menu 3 / 4	Change the lower and upper range limits
Menu 5	Change damping
Menu 6	Zero the primary variable (shortcut: hold M + Z for 5 seconds)
Menu 8	Output characteristic — linear or square root
Menu 21	Liquid level density, in g/cm³, used when the primary variable unit is a height unit
Factory reset	Damping time set to 88.888, or value +5678.0 on the mainboard display
Menu timeout	Returns to measurement state after approximately 15 seconds with no key operation

Source · INDIANA INSTRUTECH · Pressure & Differential Pressure Transmitters — technical product catalogue · Monocrystalline silicon pressure / differential pressure — installation and operating manual · IIT-3051DG monocrystalline silicon differential pressure transmitter · IIT-3051DP-SF dual-flange differential pressure transmitter

The supplied datasheets list these models with a ZT- prefix (ZT-2188-H, ZT-2188-G, ZT-3051DRG, ZT-3051DG, ZT-3051DP-SF).

Installation

Guidance from the product’s operating documentation.

01Place the transmitter horizontally before adjusting, and adjust to zero after it is installed on site.
02Install and secure the process connection before the transmitter is pressurised.
03Install in a dry environment, not exposed to rain. In harsh environments use the transmitter protection box.
04Connect the external ground screw reliably to earth. Do not remove the cover when energised in an explosive or flammable environment.
05Keep impulse piping short, prevent dross deposition, and balance the liquid column head on both sides of a differential pressure transmitter.
06Install where temperature gradient and fluctuation are small, away from strong vibration, shock and electromagnetic interference.
07For liquid flow, open the pressure tapping on the side of the process pipe and mount the transmitter beside or below it. For gas, tap at the top or side and mount beside or above. For steam, tap on the side and mount below the tapping so the impulse line fills with condensate.
08Remote-seal installations: keep capillaries as short as possible and equal in length, keep the flange, capillary and transmitter body out of direct sunlight and rain, and re-zero seasonally.

Applications and industries

Documented in the product literature, not inferred.

Applications

Gauge and vacuum pressure monitoring on plant headers
Steam and air pressure measurement
Differential pressure across filters, draught systems and orifice plates
Flow measurement using differential pressure
Liquid level in open and closed vessels
Liquid ammonia level in pressurised vessels using remote diaphragm seals

Industries

Power generation
Petrochemical
Metallurgy
Food and pharmaceutical
Paper
Textile

To specify or quote this, the team needs

Measured variable — gauge, absolute, vacuum or differential pressure
Calibrated range and engineering unit
Maximum working and static pressure
Process medium and its temperature
Ambient operating temperature
Process connection and thread standard
Wetted parts and diaphragm material
Output and communication — 4–20 mA, HART
Display and mounting bracket requirement
Hazardous-area certification required

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Technical sheetOverview, key values, gallery and applications — the selling document for Pressure & Differential Pressure Transmitters.PDF · 0.2 MB Full specificationEvery stated value, variants, open points and ordering information.PDF · 0.3 MB

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Pressure & Differential Pressure Transmitters