DAG-T4 Universal Digital Indicator/Controller Overview
The KOBOLD DAG-T4 is a universal digital panel meter and process indicator with a totalizing function, built in a 96 x 48 mm (3.78 x 1.89 in) panel format. It accepts thermocouple, Pt100 RTD, voltage, and current inputs, shows readings on a red 5-digit LED display, and provides two SPST relay alarm outputs.
The DAG-T4 is designed to measure the majority of variables encountered in most industrial processes. It also offers sensor offset, password-protected configuration, USB communication, and temperature indication in °C or °F. Programming uses four front keys or software.
What Input Signals Does the DAG-T4 Accept?
The DAG-T4 accepts eight thermocouple types, a Pt100 RTD, and linear analog current and voltage signals, with the input type selected through the front buttons. Thermocouple inputs use an internal cold junction, the Pt100 input uses a 3-wire connection (Alpha = 0.00385), and linear inputs are programmable for an indication range of -1999 to 30000.
- Current: 0 to 20 mA and 4 to 20 mA
- Voltage: 0 to 5 V, 0 to 10 V, and 0 to 50 mV
Temperature Measurement Ranges by Sensor Type
- Type J: -166 to 1742°F (-110 to 950°C)
- Type K: -238 to 2498°F (-150 to 1370°C)
- Type T: -256 to 752°F (-160 to 400°C)
- Type N: -454 to 2372°F (-270 to 1300°C)
- Type R: -58 to 3200°F (-50 to 1760°C)
- Type S: -58 to 3200°F (-50 to 1760°C)
- Type B: 752 to 3272°F (400 to 1800°C)
- Type E: -130 to 1346°F (-90 to 730°C)
- Pt100 RTD: -328 to 1562°F (-200 to 850°C)
Accuracy, Resolution, and Measurement Rate
The DAG-T4 accuracy is 0.2% of span for Pt100 and linear analog inputs. Thermocouple accuracy is 0.25% of span, ±1.8°F (±1°C) for Types J, K, T, and E, and 0.25% of span, ±5.4°F (±3°C) for Types N, R, S, and B. The measurement rate is 55 Hz with a programmable digital filter.
- Internal resolution: 65535 steps (16 bits)
- Display resolution: 32000 steps
Alarm Relay Outputs
The DAG-T4 provides two alarm outputs, each an SPST relay rated 1.5 A at 240 VAC or 30 VDC. Alarm 1 is available on terminals 5 and 6, and Alarm 2 on terminals 3 and 4. A1 and A2 indicators on the front panel light while an alarm is active. Available alarm functions:
- Absolute minimum or maximum of the process value (PV)
- Differential, minimum differential, or maximum differential, based on a reference value
- Totalizer minimum, totalizer maximum, or totalizer overflow
- Sensor break, for problems such as an interrupted sensor or bad connection
Totalizing Function
The DAG-T4 totalizer continuously integrates instantaneous process values and keeps the running total in non-volatile internal memory. The totalizer range is 0 to 9999999999 on an alternating display: the TOT indicator marks the total, and the HIGH and LOW indicators show whether digits 6 to 10 or digits 1 to 5 are displayed.
- Integration time base: second, minute, hour, or day
- Scale factor: 0.001 to 65.0, applied to the PV before totalizing
Front Panel Display and Function Keys
The DAG-T4 display is a red 5-digit LED with 16 mm (0.63 in) high digits, supported by ten red indicators for alarm status, communication, totalizer function, and min/max value. Four front keys handle programming and setpoints, and the F1 and F2 keys can be assigned functions such as total reset or min/max display.
Power Supply and 24 VDC Transmitter Excitation
The DAG-T4 operates on 100 to 240 VAC ±10%, 50/60 Hz, with a 6 VA rating. The standard version also provides a 24 VDC ±15% auxiliary supply at 50 mA on terminal 13.
Panel Mounting, Dimensions, and Protection
The DAG-T4 is designed for panel mounting in a 3.66 x 1.79 in (93.0 x 45.5 mm) cutout and is secured with plastic clamps. Overall dimensions are 3.78 in W x 1.89 in H x 1.38 in D (96 x 48 x 35 mm). Protection is IP65 from the front with the rubber seal and IP20 from the back.
- Housing: polycarbonate plastic case with an ABS and PC back panel
- Operating temperature: 32 to 122°F (0 to 50°C)
Configuration and Password Protection
DAG-T4 parameters are organized into five levels: Operation, Alarms, Input, Totalizer, and Calibration. A protection setting can lock one to four of these levels against changes, and access to protected parameters is blocked for 10 minutes after five consecutive incorrect password attempts.
Wiring and Installation Recommendations
It is recommended to route sensor input and low-voltage DC wiring away from high-current power conductors, using shielded cables where that is impractical, and keeping cable lengths short. To suppress noise generated by contactor coils and solenoids, use RC filters (0.1 µF in series with 100 ohms).
Common Questions about DAG-T4 - Universal Digital Indicator/Controller
The DAG-T4T00WSR works with thermocouples, thermo-resistance (Pt100), voltage, and current, which lets it read most variables and sensors found in industrial processes. Linear signals of 0 to 20 mA, 4 to 20 mA, 0 to 50 mV, 0 to 5 VDC, or 0 to 10 VDC are scaled to a display value between -1999 and 30000.
With a Type K thermocouple, the DAG-T4 reads from -238 to 2498°F (-150 to 1370°C), with a specified accuracy for that sensor of 0.25% of span, ±1.8°F (±1°C). A Type J sensor covers -166 to 1742°F (-110 to 950°C), and a Pt100 RTD covers -328 to 1562°F (-200 to 850°C) at 0.2% of span.
Yes. The standard DAG-T4T00WSR has an auxiliary excitation output of 24 VDC ±15% at 50 mA, available on rear terminal 13. The manual names powering two-wire 4 to 20 mA transmitters in the field as the typical use for this output and includes a wiring example for that application (Figure 04).
Both alarm outputs are SPST relays with a rating of 1.5 A at 240 VAC/30 VDC. Alarm 1 wires to terminals 5 and 6, while Alarm 2 wires to terminals 3 and 4. Available alarm functions cover PV minimum, maximum, and differential limits, three totalizer alarms, and a sensor break alarm for an open or badly connected input.
The DAG-T4 needs a panel cutout of 3.66 x 1.79 in (93.0 x 45.5 mm). The meter is inserted through the panel face, and a plastic clamp pressed on from behind holds it in place. With its rubber seal the front is rated IP65, while the rear of the housing is rated IP20.
Yes. A unit parameter in the Input level sets temperature indication to either Celsius or Fahrenheit, and the front panel carries °C and °F indicators. The documented thermocouple and Pt100 ranges are listed in both units, reaching as low as -454°F (-270°C) with a Type N sensor and as high as 3272°F (1800°C) with a Type B sensor.
The total can be cleared from the keypad once the Reset Total function has been assigned to the F1 or F2 key. Alternatively, the Power Up Reset parameter can clear the total every time the indicator is switched on. With Power Up Reset disabled, the stored total is restored from non-volatile memory at power-up.
A Protection parameter in the Calibration level selects one of four protection levels, ranging from the Calibration level alone up to Alarms, Input, Totalization, and Calibration together. Protected levels can be viewed but not edited without the access password, and a master password lets the user define a new password if the old one is forgotten.
The DAG-T4 requires 100 to 240 VAC ±10% at 50 or 60 Hz and is rated 6 VA. Its specified operating temperature is 32 to 122°F (0 to 50°C), and relative humidity is limited to 80% at 86°F (30°C), with the allowed humidity reduced by 3% for every 1.8°F (1°C) above that point.
Product Specifications
Display
Programmable, 5-digit LED, Red
Nominal Dimensions
96x48 mm
Input
Thermocouple, Pt100, Current and Voltage
Output
Relay - 2 N/O Contacts
Input Power
100...240 VAC ± 10%
Product Features
Versatile Process Indicator with Totalizing Function
Thermocouple, RTD and Linear Analog Inputs
96 mm x 48 mm Nominal Size
Large, 5-Digit LED Display
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